CN114935135A - Brake lamp control circuit and control method of vehicle, vehicle control unit and vehicle - Google Patents
Brake lamp control circuit and control method of vehicle, vehicle control unit and vehicle Download PDFInfo
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- CN114935135A CN114935135A CN202210811226.4A CN202210811226A CN114935135A CN 114935135 A CN114935135 A CN 114935135A CN 202210811226 A CN202210811226 A CN 202210811226A CN 114935135 A CN114935135 A CN 114935135A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/04—Arrangement of electric circuit elements in or on lighting devices the elements being switches
- F21V23/0442—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors
- F21V23/0492—Arrangement of electric circuit elements in or on lighting devices the elements being switches activated by means of a sensor, e.g. motion or photodetectors the sensor detecting a change in orientation, a movement or an acceleration of the lighting device, e.g. a tilt switch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/44—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for indicating braking action or preparation for braking, e.g. by detection of the foot approaching the brake pedal
- B60Q1/441—Electric switches operable by the driver's pedals
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2103/00—Exterior vehicle lighting devices for signalling purposes
- F21W2103/35—Brake lights
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
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Abstract
The invention provides a brake lamp control circuit and a brake lamp control method of a vehicle, a vehicle control unit and the vehicle. The acceleration detection unit outputs a first signal when the acceleration of the vehicle is less than a preset deceleration threshold, and outputs a second signal when the acceleration of the vehicle is greater than a preset acceleration threshold. The switch unit is electrically connected with the signal output end of the acceleration detection unit. The pedal signal input unit is arranged between the vehicle-mounted power supply and the brake lamp in a parallel connection mode with the switch unit. The switch unit is used for connecting the vehicle-mounted power supply and the brake lamp according to a first signal from the acceleration detection unit and disconnecting the vehicle-mounted power supply and the brake lamp according to a second signal from the acceleration detection unit. According to the scheme, the state of the brake lamp is controlled according to the output signal of the acceleration detection unit, so that the deceleration of the vehicle can be accurately and quickly found, and the traffic accident of rear-end collision can be avoided as much as possible.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted light control, in particular to a brake lamp control circuit and a control method of a vehicle, a vehicle control unit and the vehicle.
Background
With the vigorous development of the automobile industry, the holding capacity of vehicles is greatly increased, and the number of driving accidents is also rising year by year.
A large number of data statistics and analysis researches show that the proportion of rear-end collisions of vehicles to total traffic accidents is about 47%. Rear-end collisions have become the most common occurrence in traffic accidents. And further analysis and research show that 30% of rear-end collisions are caused by rear-end collisions due to the fact that the deceleration behavior of the front vehicle is not timely and normally expressed, and the rear vehicle is not in time to brake. The reasons why the deceleration behavior of the front vehicle is not normally expressed include the following: first, the brake light control circuit of the preceding vehicle is aged, resulting in the driver stepping on the brake pedal but not lighting the brake light; second, the vehicle has failed engine, or broken axle, or transmission such as gearbox, causing the vehicle to slow down without the driver depressing the brake pedal.
The deceleration behavior of the preceding vehicle is generally expressed by the brake light being turned on. The existing vehicle controls the brake lamp according to the signal of the brake pedal, namely, when the brake pedal is stepped down, the brake lamp is turned on; the brake pedal is released, and the brake lamp is turned off. However, in the conventional control mode, the situation that the deceleration behavior cannot be expressed normally is still easy to occur, which affects the driving safety of the vehicle and improves the incidence rate of rear-end accidents.
Disclosure of Invention
The invention aims to solve the problem that in the prior art, a brake lamp is controlled according to a signal of a brake pedal, so that the condition that the deceleration behavior cannot be normally expressed easily occurs, and the driving safety of a vehicle is further influenced.
In order to solve the above problems, an embodiment of the present invention discloses a brake lamp control circuit of a vehicle, including an acceleration detection unit that detects a vehicle acceleration of the vehicle in a forward direction thereof and outputs a first signal when the vehicle acceleration is smaller than a preset deceleration threshold and outputs a second signal when the vehicle acceleration is larger than the preset acceleration threshold; the switch unit is arranged between a vehicle-mounted power supply of the vehicle and a brake lamp of the vehicle and is electrically connected with the signal output end of the acceleration detection unit; the pedal signal input unit is arranged between the vehicle-mounted power supply and the brake lamp in a parallel connection mode with the switch unit, is connected with a brake pedal of the vehicle and receives a brake signal from the brake pedal; the switch unit is electrically connected to a signal output terminal of the acceleration detection unit, and is configured to connect the electrical connection between the vehicle-mounted power supply and the brake lamp according to a first signal from the acceleration detection unit and disconnect the electrical connection between the vehicle-mounted power supply and the brake lamp according to a second signal from the acceleration detection unit.
With the adoption of the scheme, the acceleration detection unit is arranged to detect the vehicle acceleration of the vehicle in the advancing direction of the vehicle, and output the first signal when the vehicle acceleration is smaller than the preset deceleration threshold value and output the second signal when the vehicle acceleration is larger than the preset acceleration threshold value. And, the switching unit controls connection or disconnection of the in-vehicle power supply and the brake lamp according to an output signal from the acceleration detection unit. Through setting up acceleration detecting element, and control the state of brake light according to acceleration detecting element's output signal, can be so that the vehicle deceleration can be found accurately, fast, and show the state of vehicle deceleration through the brake light, even circuit ageing has appeared, the driver steps on the brake pedal but the condition that the brake light is not bright, or the driver that vehicle self trouble arouses under the condition that the vehicle has taken place the deceleration under the condition that does not step on the brake pedal, the brake light all can be lighted and opened, the warning rear truck is noticed, and then avoid causing the traffic accident of knocking into the back. And the pedal signal input unit is arranged between the vehicle-mounted power supply and the brake lamp in a parallel connection mode with the switch unit, so that the brake lamp can be controlled by the brake pedal, and the control of the original brake lamp of the vehicle cannot be influenced.
According to another specific embodiment of the present invention, a brake light control circuit for a vehicle according to an embodiment of the present invention further includes: the hysteresis amplifying unit is arranged between the acceleration detecting unit and the switch unit; one signal input end of the hysteresis amplification unit is connected with the signal output end of the acceleration detection unit, and the signal output end of the hysteresis amplification unit is connected with the switch unit; and when the hysteresis amplifying unit receives the mutual jump between the first signal and the second signal output by the acceleration detecting unit, the hysteresis amplifying unit controls the switch unit to connect or disconnect the electric connection between the vehicle-mounted power supply and the brake lamp.
By adopting the scheme, the hysteresis amplification unit is arranged, so that the state of the brake lamp can not be suddenly changed, the condition that the output is fluctuated due to signal fluctuation and the brake lamp is stroboscopic is avoided, and the driving experience is improved.
According to another specific embodiment of the present invention, a brake lamp control circuit of a vehicle is disclosed in the embodiments of the present invention, the hysteresis amplifying unit includes a voltage comparator, a first hysteresis element, a second hysteresis element, a first voltage dividing element, a second voltage dividing element, and a third voltage dividing element; the non-inverting input end of the voltage comparator is a signal input end of the hysteresis amplifying unit, and the output end of the voltage comparator is a signal output end of the hysteresis amplifying unit; the first hysteresis element is arranged between the signal output end of the acceleration detection unit and the non-inverting input end of the voltage comparator; the second hysteresis element is connected with the voltage comparator in parallel, one end of the second hysteresis element is connected with the non-inverting input end of the voltage comparator, and the other end of the second hysteresis element is connected with the output end of the voltage comparator; one end of the first voltage division element is connected with the output end of the voltage comparator, and the other end of the first voltage division element is connected with a high level; one end of the second voltage division element is connected with the inverting input end of the voltage comparator, and the other end of the second voltage division element is connected with a high level; one end of the third voltage division element is connected with the inverting input end of the voltage comparator, and the other end of the third voltage division element is grounded.
By adopting the scheme, the voltage comparator, the first hysteresis element, the second voltage division element and the third voltage division element jointly form the hysteresis comparison circuit, so that the hysteresis amplification unit has two threshold voltages, namely a preset deceleration threshold and a voltage corresponding to a preset acceleration threshold, the brake lamp control circuit has certain delay characteristic, the stability is good, and the stroboscopic of the brake lamp cannot be caused.
According to another specific embodiment of the present invention, a brake lamp control circuit of a vehicle according to an embodiment of the present invention includes an acceleration detection unit including an acceleration sensor and a bandwidth control element; the output end of the acceleration sensor is the signal output end of the acceleration detection unit; the power input end of the acceleration sensor is connected with a high level, and the output end of the acceleration sensor is connected with the hysteresis amplification unit; the bandwidth control element is connected between the output terminal and ground.
By adopting the scheme, the bandwidth of the electric signal output by the acceleration sensor can be controlled by arranging the bandwidth control element, so that the stability and the reliability of the circuit are improved.
According to another specific embodiment of the present invention, the brake lamp control circuit of the vehicle disclosed in the embodiment of the present invention further includes a power supply unit, wherein the power supply unit includes a voltage conversion chip, an input filter element, and an output filter element; the input end of the voltage conversion chip is connected with the vehicle-mounted power supply, the output end of the voltage conversion chip is respectively connected with the power input end of the hysteresis amplification unit and the power input end of the acceleration detection unit, the voltage of the vehicle-mounted power supply is converted into the voltage corresponding to the high level, and the electric energy is transmitted to the hysteresis amplification unit and the acceleration detection unit; the input filter element and the output filter element are connected with the voltage conversion chip in parallel; one end of the input filter element is connected with the input end of the voltage conversion chip, and the other end of the input filter element is grounded; one end of the output filter element is connected with the output end of the voltage conversion chip, and the other end of the output filter element is grounded.
By adopting the scheme, the input filter element and the output filter element are respectively arranged at the input end and the output end of the voltage conversion chip, so that the stability of the input signal and the output signal of the voltage conversion chip is better, and the condition that the signal fluctuation of the whole control circuit is larger due to the sudden change of the electric signal and the influence is caused on the control of the brake lamp can be avoided.
According to another specific embodiment of the present invention, in the brake lamp control circuit of the vehicle disclosed in the embodiment of the present invention, the switch unit includes a field effect transistor, a triode, a fourth voltage division element and a fifth voltage division element; the field effect tube is arranged between the vehicle-mounted power supply and the brake lamp and is electrically connected with the triode; the fourth voltage division element and the fifth voltage division element are arranged between the vehicle-mounted power supply and the triode in a series connection mode; one end of the fourth voltage division element is connected with one end of the fifth voltage division element and then connected to the first end of the field effect transistor; the other end of the fourth voltage division element is connected with a vehicle-mounted power supply; the second end of the field effect tube is connected with a vehicle-mounted power supply, and the third end of the field effect tube is connected with a brake lamp; the first end of the triode is connected with the signal output end of the hysteresis amplification unit, the second end of the triode is connected with the other end of the fifth voltage division element, and the third end of the triode is grounded.
According to another embodiment of the present invention, the brake lamp control circuit of the vehicle according to the embodiment of the present invention, the preset deceleration threshold is in a range of-0.1 g to-0.3 g; the range of the preset acceleration threshold is 0g to 0.2 g; the first hysteresis element and the second hysteresis element are both resistors; the first voltage division element, the second voltage division element, the third voltage division element, the fourth voltage division element and the fifth voltage division element are all resistors; the bandwidth control element is a capacitor; the input filter element and the output filter element are both capacitors; the field effect transistor is a P-channel MOS transistor, the first end of the field effect transistor is a grid electrode of the MOS transistor, the second end of the field effect transistor is a source stage of the MOS transistor, and the third end of the field effect transistor is a drain stage of the MOS transistor; the first end of the triode is the base level of the triode, the second end of the triode is the collector of the triode, and the third end of the triode is the emitter of the triode.
The embodiment of the invention discloses a control method of a brake lamp control circuit of a vehicle, which comprises the following steps:
s1: an acceleration detection unit acquires a vehicle acceleration of a vehicle in a forward direction thereof;
s2: an acceleration detection unit outputs a detection voltage according to a vehicle acceleration, a sensitivity of an acceleration sensor, and a bias voltage of the acceleration sensor;
s3: the hysteresis amplifying unit outputs an amplified voltage according to the detection voltage from the acceleration detecting unit;
s4: the triode controls the conduction and/or the cut-off of the field effect transistor according to the amplified voltage from the hysteresis amplifying unit so as to control the connection and/or the disconnection of the vehicle-mounted power supply and the brake lamp.
According to another embodiment of the present invention, in the method for controlling a brake lamp control circuit of a vehicle according to the embodiment of the present invention, in step S2, the detection voltage is calculated according to the following formula:
V1＝S*a+Vb
where V1 is the detection voltage, S is the sensitivity of the acceleration sensor, a is the vehicle acceleration, and Vb is the bias voltage of the acceleration sensor.
The embodiment of the invention discloses a vehicle control unit, which comprises: a memory for storing a control program; a processor which, when processing the control program, executes the steps of the control method of the brake light control circuit of the vehicle as described in any of the embodiments above.
The embodiment of the invention discloses a vehicle, which comprises the vehicle control unit described in the embodiment.
The beneficial effects of the invention are:
the brake lamp control circuit of vehicle that this scheme provided, through setting up acceleration detecting element, and control the state of brake lamp according to acceleration detecting element's output signal, can make the vehicle slow down can be accurate, discover fast, and show the state of vehicle deceleration through the brake lamp, even the circuit is ageing to have appeared, the driver steps on brake pedal but the condition that the brake lamp is not bright, or the driver that vehicle self trouble arouses under the condition that the vehicle has taken place the condition of decelerating under the condition that does not step on brake pedal, the brake lamp all can light and open, the warning back car is noticed, and then avoid causing the traffic accident that knocks into the back. And the pedal signal input unit is arranged between the vehicle-mounted power supply and the brake lamp in a parallel connection mode with the switch unit, so that the brake lamp can be controlled by the brake pedal, and the control of the original brake lamp of the vehicle cannot be influenced.
According to the vehicle control unit and the vehicle, due to the fact that the control method of the brake lamp control circuit of the vehicle is executed, traffic accidents causing rear-end collisions can be avoided as much as possible. In addition, the brake lamp can be controlled by the brake pedal, the control of the original brake lamp of the vehicle is not influenced, and the driving experience of passengers is improved. In addition, stroboscopic also can not take place for the stop lamp, has further improved the reliability of vehicle and passenger's experience and has felt.
Drawings
Fig. 1 is a schematic connection diagram of a brake lamp control circuit of a vehicle according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a brake lamp control circuit of a vehicle according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transistor according to an embodiment of the present invention;
fig. 4 is a schematic flowchart of a control method of a brake lamp control circuit of a vehicle according to an embodiment of the present invention.
Description of reference numerals:
1. an acceleration detection unit; 2. a vehicle-mounted power supply; 3. a brake light; 4. a pedal signal input unit; 5. a voltage comparator; 6. a first hysteresis element; 7. a second hysteresis element; 8. a first voltage dividing element; 9. a second voltage dividing element; 10. a third voltage dividing element; 11. an acceleration sensor; 12. a bandwidth control element; 13. a voltage conversion chip; 14. an input filter element; 15. an output filter element; 16. a field effect transistor; 17. a triode; 18. a fourth voltage dividing element; 19. a fifth voltage dividing element.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that the features of the invention be limited to that embodiment. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1:
in order to solve the problem that in the prior art, a brake lamp is controlled according to a signal of a brake pedal, so that the situation that a deceleration behavior cannot be normally expressed easily occurs, and further the driving safety of a vehicle is affected, the embodiment of the invention provides a brake lamp control circuit of the vehicle. Specifically, referring to fig. 1, the brake lamp control circuit of the vehicle provided in the present embodiment includes an acceleration detection unit 1, a switch unit, and a pedal signal input unit 4.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 1, the acceleration detection unit 1 detects the acceleration of the vehicle in the forward direction a of the vehicle, and outputs a first signal when the acceleration of the vehicle is less than a preset deceleration threshold, and outputs a second signal when the acceleration of the vehicle is greater than a preset acceleration threshold. Specifically, the forward direction of the vehicle refers to the direction in which the vehicle moves, and is the rearward direction when the vehicle is in reverse gear; when the vehicle is coasting in forward gear or coasting in neutral, the forward direction of the vehicle is the forward direction. More specifically, the preset deceleration threshold ranges from-0.1 g to-0.3 g; for example, -0.1g, -0.15g, -0.2g, -0.3g, or other values within the range. "-" indicates that the vehicle is making a decelerating movement. The range of the preset acceleration threshold is 0g to 0.2 g; for example, it may be 0g, 0.05g, 0.1g, 0.2g, or other values within this range.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 1, a switching unit is disposed between an on-vehicle power supply 2 of the vehicle and a brake lamp 3 of the vehicle, and is electrically connected to a signal output terminal of the acceleration detection unit 1. Specifically, the vehicle-mounted power supply 2 is a power inverter capable of converting DC12V direct current into AC220V alternating current identical to commercial power, and is not different from the vehicle-mounted power supply 2 in the related art. The brake lamp 3 is also a lamp which is arranged at the tail of the vehicle and used for prompting the brake action of the vehicle in front of the rear vehicle, and a common vehicle is provided with a high-level brake lamp and a left brake lamp and a right brake lamp. The circuit for controlling the stop lamp described in this embodiment can control turning on or off of the high-mount stop lamp and the left and right stop lamps. I.e. the brake light 3 in fig. 1 covers virtually all light bulbs on the vehicle that are capable of indicating a braking action of the preceding vehicle. The prior art can be referred to as the connection mode of the high-mount stop lamp and the left and right stop lamps.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 1, a pedal signal input unit 4 is provided between the vehicle-mounted power supply 2 and the brake lamp 3 in parallel with the switching unit, and the pedal signal input unit 4 is connected to a brake pedal of the vehicle to receive a brake signal from the brake pedal. That is, the stop lamp 3 may be simultaneously controlled by the switch unit and the pedal signal input unit 4. Specifically, a brake switch is arranged below the brake pedal, and the brake signal is also a signal for stepping down the brake pedal. When the brake pedal is pressed down, the brake switch switches on a circuit where the brake lamp 3 is located, so that the brake lamp 3 is turned on, and otherwise, the brake lamp 3 is not turned on. I.e. the pedal signal input unit 4 is active high.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 1, the switching unit is electrically connected to the signal output terminal of the acceleration detecting unit 1, connects the electrical connection of the in-vehicle power supply 2 and the brake lamp 3 according to the first signal from the acceleration detecting unit 1, and disconnects the electrical connection of the in-vehicle power supply 2 and the brake lamp 3 according to the second signal from the acceleration detecting unit 1. That is, when the acceleration of the vehicle is smaller than the preset deceleration threshold, the acceleration detection unit 1 outputs a first signal indicating that the vehicle is decelerating, the switch unit connects the vehicle-mounted power supply 2 and the brake lamp 3, and the brake lamp 3 is turned on to indicate that the vehicle is decelerating. When the acceleration of the vehicle is greater than the preset acceleration threshold value, the acceleration detection unit 1 outputs a second signal, which indicates that the vehicle starts accelerating or runs at a constant speed, and then the switch unit disconnects the vehicle-mounted power supply 2 from the brake lamp 3, and the brake lamp 3 is not turned on. It should be noted that when the acceleration detecting unit 1 detects that the vehicle acceleration is between the preset deceleration threshold and the preset acceleration threshold, the switch unit will remain in the previous state.
Still further, in the brake light control circuit of the vehicle according to the present invention, there is a manner that the acceleration detecting unit 1 is provided to detect the acceleration of the vehicle in the forward direction a thereof, and to output the first signal when the acceleration of the vehicle is smaller than a preset deceleration threshold, and to output the second signal when the acceleration of the vehicle is larger than a preset acceleration threshold. The switching unit controls connection and disconnection of the in-vehicle power supply 2 and the brake lamp 3 in accordance with an output signal from the acceleration detection unit 1. Through setting up acceleration detecting element 1, and control the state of stop lamp 3 according to the output signal of acceleration detecting element 1, can make the vehicle slow down can be found accurately, fast, and show the state of vehicle deceleration through stop lamp 3, even circuit ageing has appeared, the driver steps on the condition that brake pedal but the stop lamp is not bright, or the driver that vehicle self trouble arouses has taken place under the condition that the vehicle has already taken place the speed reduction under the condition that does not step on brake pedal, stop lamp 3 all can light and start, the warning back car is noted, and then avoid causing the traffic accident of knocking into the back. The pedal signal input unit 4 is provided between the vehicle-mounted power supply 2 and the stop lamp 3 in parallel with the switch unit, so that the stop lamp 3 can be controlled by the brake pedal without affecting the control of the original stop lamp 3 of the vehicle.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 2, the brake lamp control circuit further includes a hysteresis amplifying unit. The hysteresis amplifying unit is disposed between the acceleration detecting unit 1 and the switch unit. One signal input end of the hysteresis amplification unit is connected with the signal output end of the acceleration detection unit 1, and the signal output end of the hysteresis amplification unit is connected with the switch unit. And when the hysteresis amplifying unit receives the mutual jump between the first signal and the second signal output from the acceleration detecting unit 1, the hysteresis amplifying unit controls the switch unit to connect or disconnect the electric connection between the vehicle-mounted power supply 2 and the brake lamp 3. That is to say, when the acceleration detection unit 1 detects the first signal, the control switch unit connects the connection between the vehicle-mounted power supply 2 and the stop lamp 3, the stop lamp 3 is turned on, until the acceleration detection unit 1 detects the second signal, the control switch unit connects the disconnection between the vehicle-mounted power supply 2 and the stop lamp 3, and the stop lamp 3 is turned off. When the acceleration detection unit 1 does not detect the input of the second signal, the current state of the connection of the in-vehicle power supply 2 and the brake lamp 3 is maintained even if the vehicle acceleration is greater than the preset deceleration threshold. On the contrary, when the acceleration detection unit 1 detects the second signal, the control switch unit disconnects the electrical connection between the vehicle-mounted power supply 2 and the brake lamp 3, the brake lamp 3 is turned off, until the acceleration detection unit 1 detects the first signal, the control switch unit connects the electrical connection between the vehicle-mounted power supply 2 and the brake lamp 3, and the brake lamp 3 is turned on. When the acceleration detection unit 1 does not detect the input of the first signal, the current state of disconnecting the vehicle-mounted power supply 2 from the brake lamp 3 is maintained even if the vehicle acceleration is smaller than the preset acceleration threshold.
For example, the preset deceleration threshold is-0.2 g, the preset acceleration threshold is 0.1g, when the acceleration of the vehicle is-0.5 g, the vehicle is decelerating, the switch unit connects the vehicle-mounted power supply 2 with the electric connection of the brake lamp 3, and the brake lamp 3 is turned on. When the acceleration of the vehicle is increased from-0.5 g to-0.1 g, the deceleration of the vehicle is reduced, but the switch unit still keeps the state of connecting the electric connection between the vehicle-mounted power supply 2 and the brake lamp 3 at the moment, and the brake lamp 3 is still in a lighting state. When the acceleration of the vehicle is larger than 0.1g, which indicates that the vehicle starts to accelerate at the moment, the switch unit disconnects the electric connection between the vehicle-mounted power supply 2 and the brake lamp 3, and the brake lamp 3 is turned off. The mode has, owing to be provided with this hysteresis amplification unit, can make the state of stop lamp 3 can not take place the sudden change, avoided leading to the output undulant because of signal fluctuation, and then make stop lamp 3 take place stroboscopic condition and take place, promoted the driving and experienced the sense.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 2, the hysteresis amplifying unit includes a voltage comparator 5, a first hysteresis element 6, a second hysteresis element 7, a first voltage dividing element 8, a second voltage dividing element 9, and a third voltage dividing element 10. The non-inverting input terminal of the voltage comparator 5 is a signal input terminal of the hysteresis amplifying unit, and the output terminal is a signal output terminal of the hysteresis amplifying unit.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 2, a first hysteresis element 6 is disposed between the signal output terminal of the acceleration detection unit 1 and the non-inverting input terminal of the voltage comparator 5. The second hysteresis element 7 is connected in parallel with the voltage comparator 5, and has one end connected to the non-inverting input terminal of the voltage comparator 5 and the other end connected to the output terminal of the voltage comparator 5. One end of the first voltage division element 8 is connected with the output end of the voltage comparator 5, and the other end is connected with the high level 3.3V. One end of the second voltage division element 9 is connected with the inverting input end of the voltage comparator 5, and the other end is connected with the high level 3.3V. One end of the third voltage division element 10 is connected to the inverting input terminal of the voltage comparator 5, and the other end is grounded GND. Specifically, the voltage comparator 5, the first hysteresis element 6, the second hysteresis element 7, the second voltage dividing element 9, and the third voltage dividing element 10 jointly form a hysteresis comparison circuit, so that the hysteresis amplification unit has two threshold voltages, that is, a preset deceleration threshold and a voltage corresponding to a preset acceleration threshold, so that the brake lamp control circuit has a certain delay characteristic, and is good in stability and free from causing stroboflash of the brake lamp 3. And, the high levels of the second voltage dividing element 9, the third voltage dividing element 10 and 3.3V constitute a series voltage dividing circuit, thereby providing a voltage threshold V5 to the inverting input terminal of the voltage comparator 5. More specifically, the first hysteresis element 6 and the second hysteresis element 7 are both resistors. The first voltage dividing element 8, the second voltage dividing element 9 and the third voltage dividing element 10 are all resistors. The voltage comparator 5 is a non-inverting voltage comparator.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 2, the acceleration detection unit 1 includes an acceleration sensor 11 and a bandwidth control element 12. The output end of the acceleration sensor 11 is the signal output end of the acceleration detection unit 1. The power input end of the acceleration sensor 11 is connected to the high level 3.3V, and the output end is connected to the hysteresis amplifying unit and connected to the first hysteresis element 6. The bandwidth control element 12 is connected between the output terminal and ground GND. The acceleration sensor 11 can convert the acquired acceleration signal into an electric signal and output the electric signal. In fact, the acceleration sensor 11 can acquire the acceleration of the vehicle in the length, width and height directions thereof, and therefore the acceleration sensor 11 has three outputs of x, y and z. In the present embodiment, the stop lamp 3 can be controlled only by the acceleration of the vehicle in the longitudinal direction and the traveling direction, so that the present embodiment only connects the output terminal x to the hysteresis amplifying unit to transmit the information indicating the acceleration of the vehicle in the traveling direction to the hysteresis amplifying unit. In particular, the bandwidth control element 12 is a capacitor.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 2, the brake lamp control circuit further includes a power supply unit including a voltage conversion chip 13, an input filter element 14, and an output filter element 15. The voltage conversion chip 13 is configured to convert a 12V voltage input by the vehicle-mounted power supply 2 into a 3.3V high level to be supplied to other circuits or elements, such as the acceleration sensor 11 and the hysteresis amplification unit. The input filter element 14 is used for filtering the signal transmitted from the vehicle-mounted power supply 2 to the voltage conversion chip 13. The output filter element 15 is used for filtering signals output by the voltage conversion chip 13 to other circuits or elements. Specifically, the input end of the voltage conversion chip 13 is connected to the vehicle-mounted power supply 2, and the output end of the voltage conversion chip is connected to the power input end of the hysteresis amplification unit and the power input end of the acceleration detection unit 1, respectively, so as to convert the voltage of the vehicle-mounted power supply 2 into a voltage corresponding to a high level and transmit the electric energy to the hysteresis amplification unit and the acceleration detection unit 1. The input filter element 14 and the output filter element 15 are connected in parallel to the voltage conversion chip 13.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 2, one end of the input filter element 14 is connected to the input terminal of the voltage conversion chip 13, and the other end is grounded to GND. One end of the output filter element 15 is connected to the output end of the voltage conversion chip 13, and the other end is grounded to GND. More specifically, the input filter element 14 and the output filter element 15 are both capacitors. In this way, because the input filter element 14 and the output filter element 15 are respectively arranged at the input end and the output end of the voltage conversion chip 13, the stability of the input signal and the output signal of the voltage conversion chip 13 is better, and the situation that the control of the brake lamp 3 is influenced by the larger signal fluctuation of the whole control circuit due to the sudden change of the electric signal is avoided.
Further, in the brake lamp control circuit of the vehicle according to the present invention, referring to fig. 2, the switching unit is configured to amplify an output signal of the hysteresis amplifying unit and drive the brake lamp 3. And, the switching unit includes a field effect transistor 16, a transistor 17, a fourth voltage division element 18, and a fifth voltage division element 19. The field effect transistor 16 is disposed between the vehicle-mounted power supply 2 and the stop lamp 3, and is electrically connected to the triode 17. The fourth voltage division element 18 and the fifth voltage division element 19 are arranged in series between the vehicle-mounted power supply 2 and the transistor 17. One end of the fourth voltage division element 18 is connected to one end of the fifth voltage division element 19 and then to the first end of the fet 16. The other end of the fourth voltage dividing element 18 is connected to the vehicle-mounted power supply 2. The second end of the field effect tube 16 is connected with the vehicle-mounted power supply 2, and the third end is connected with the brake lamp 3. Referring to fig. 3, a first terminal of the triode 17 is connected to the signal output terminal of the hysteresis amplification unit, a second terminal thereof is connected to the other terminal of the fifth voltage division element 19, and a third terminal thereof is grounded to GND. In particular, the fourth voltage dividing element 18 and the fifth voltage dividing element 19 are both resistors. The field effect transistor 16 is a P-channel MOS transistor, and a first end of the field effect transistor 16 is a gate G of the MOS transistor, a second end of the field effect transistor 16 is a source S of the MOS transistor, and a third end of the field effect transistor 16 is a drain D of the MOS transistor. A first terminal of the transistor 17 is a base stage b of the transistor 17, a second terminal of the transistor 17 is a collector c of the transistor 17, and a third terminal of the transistor 17 is an emitter e of the transistor 17. In addition, a base resistor R1 is further provided at the base b of the transistor 17, and an emitter resistor R2 is further provided at the emitter e.
Specifically, when V2 is at a high level of 3.3V, the base voltage of transistor 17 is greater than its turn-on voltage, and transistor 17 is turned on. The voltage of the triode 17 is divided by the fourth voltage dividing element 18 and the fifth voltage dividing element 19, so that the voltage V4 between the fourth voltage dividing element 18 and the fifth voltage dividing element 19 is a lower voltage, the voltage of the gate of the field effect transistor 16 is lower than that of the source, the field effect transistor 16 is conducted, and the brake lamp 3 is turned on. When V2 is low, the base voltage of transistor 17 is lower than its turn-on voltage, transistor 17 is turned off, the voltage V4 is the voltage of vehicle power supply 2, the voltage of gate of fet 16 relative to the source is about 0V, fet 16 is turned off, and stop lamp 3 is off.
Example 2:
based on the above brake light control circuit of the vehicle, the present embodiment provides a control method of the brake light control circuit of the vehicle. Specifically, referring to fig. 4, the control method of the brake lamp control circuit of the vehicle provided in the present embodiment includes the following steps:
s1: an acceleration detection unit acquires a vehicle acceleration of a vehicle in a forward direction thereof;
s2: an acceleration detection unit outputs a detection voltage according to the acceleration of the vehicle, the sensitivity of the acceleration sensor, and the bias voltage of the acceleration sensor;
s3: the hysteresis amplifying unit outputs an amplified voltage according to the detection voltage from the acceleration detecting unit;
s4: the triode controls the conduction and/or the cut-off of the field effect transistor according to the amplified voltage from the hysteresis amplifying unit so as to control the connection and/or the disconnection of the vehicle-mounted power supply and the brake lamp.
Specifically, the acceleration detection unit converts information of vehicle acceleration of the vehicle in its forward direction into an electric signal and outputs the electric signal to the hysteresis amplification unit, and the hysteresis amplification unit amplifies the electric signal and obtains an amplified voltage. The triode is communicated with the hysteresis amplifying unit to control the conduction or the cut-off of the hysteresis amplifying unit according to the amplifying voltage, and further control the conduction or the cut-off of the field effect tube, so that the connection or the disconnection of the vehicle-mounted power supply and the brake lamp is controlled.
Further, in the control method of the brake lamp control circuit of the vehicle according to the present invention, in step S2, the detection voltage is calculated according to the following formula:
V1＝S*(-a)+Vb
where V1 is the detection voltage, S is the sensitivity of the acceleration sensor, a is the vehicle acceleration, and Vb is the bias voltage of the acceleration sensor.
Example 3:
based on the above brake light control circuit of the vehicle and the control method of the brake light control circuit, the embodiment provides a specific brake light control circuit. In particular, refer to fig. 2.
The vehicle-mounted power supply 2 can supply 12V.
The voltage conversion chip 13 is a power supply chip TLS202B1MBV 33. A pin I and a pin II of the chip are power input pins and are connected with a 12V vehicle-mounted power supply 2, and a pin III and a pin IV are power grounds and are connected with GND. And the V pin is a power supply output pin and provides 3.3V voltage to other circuits, including a pin II and a pin III of the acceleration sensor and a pin I of the voltage comparator 5.
The acceleration sensor 11 is an ADXL327 acceleration sensor, which can measure accelerations in the range of ± 2 g. Pins II and III of the acceleration sensor 11 are power input pins and are connected with a 3.3V high level, pins IV, V, VI and VII are grounding pins and are connected to GND, pin I is suspended, and pins x, y and z are X, Y, Z triaxial acceleration signal output. The circuit only uses the X axial acceleration, and the y pin and the z pin are suspended. The x pin is connected to a bandwidth control element 12 to control the output bandwidth. The bandwidth control element 12 is a capacitor with a capacitance of 0.01, and the corresponding output bandwidth is 500 Hz.
In the present embodiment, the sensitivity of the acceleration sensor 11 is 420mV/g, the offset voltage at 0g is 1.65V, and the output voltage of the acceleration sensor 11 is V1 ═ 0.420 × a + 1.65. When the detected acceleration value is smaller than the preset deceleration threshold value-0.2 g, it indicates that the vehicle is braking, and the output voltage of the x pin of the acceleration sensor 11 is V1-0.462 × 0.2+ 1.65-1.742V. When the detected acceleration value is greater than the preset acceleration threshold value 0.1g, it indicates that the vehicle is accelerating, and the output voltage V1 of the x pin of the acceleration sensor 11 is 0.462 (-0.1) +1.65 is 1.604V.
The hysteresis amplifying unit can output a high level of 3.3V when V1 is more than 1.742V and output a low level of 0V when V is less than 1.604V. The voltage comparator 5 is TLV9022-Q1, a pin I is connected with a high level of 3.3V, and a pin II is grounded. The voltage comparator 5, the first hysteresis element 6, the second hysteresis element 7, the second voltage dividing element 9 and the third voltage dividing element 10 jointly form a hysteresis comparison circuit, so that the hysteresis amplification unit has two threshold voltages, namely a preset deceleration threshold and a voltage corresponding to a preset acceleration threshold, so that the brake lamp control circuit has a certain delay characteristic, is good in stability, and cannot cause stroboflash of the brake lamp 3. The high levels of the second voltage dividing element 9, the third voltage dividing element 10 and 3.3V constitute a series voltage dividing circuit, providing a voltage threshold V5 for the inverting input of the voltage comparator 5. The resistance value of the second partial pressure element 9 is R4 — 37K Ω, and the resistance value of the third partial pressure element 10 is R5 — 38K Ω, from which V5 — 3.3R 4/(R4+ R5) -1.672V can be calculated. The turn-on threshold and the turn-off threshold of the voltage comparator 5, i.e. the threshold values, are respectively V TH ＝V5*R1/R2+V5、V TL V5- (V2-V5) (R1/R2). Where R1 is the resistance value of the first hysteresis element 6, and R2 is the resistance value of the second hysteresis element 7. Let R2 ═ 2M Ω, R5 ═ 3K Ω, V TH ＝1.742V，V TL 1.604V, V2 ≈ 3.3V, calculated to R1 ═ 83.73K Ω.
In this embodiment, the transistor 17 of the switching unit is a digital transistor DTC124XCAT116, and the field-effect transistor 16 is a P-channel MOS transistor STD15P6F6 AG. The resistance of the fourth voltage dividing element 18 is R9-47K Ω, and the resistance of the fifth voltage dividing element 19 is R10-3K Ω. When V2 is at a high level of 3.3V, the base voltage of the transistor 17 is greater than 0.7V, the transistor 17 is turned on, and after voltage division is performed by the fourth voltage dividing element 18 and the fifth voltage dividing element 19, V4 equals 12 × R10/(R9+ R10) equals 0.72V, VGS of the fet 16 equals 0.72-12V, the fet 16 is turned on, and the brake lamp 3 is turned on. When the V2 is at low level of 0V, the base voltage of the triode 17 is less than 0.7V, the triode 17 is cut off, V4 is approximately equal to 12V, VGS of the field effect tube 16 is approximately equal to 0V, the field effect tube 16 is cut off, and the brake lamp 3 is extinguished after power failure.
Example 4:
based on the control method of the brake lamp control circuit of the vehicle, the embodiment provides a vehicle control unit, which comprises a memory and a controller.
The memory is used for storing a control program, and the processor executes the steps of the control method of the brake lamp control circuit of the vehicle as described in the above embodiment when processing the control program. The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM). The controller is a hardware circuit having a data processing function, such as a CPU or the like.
Example 5:
based on the vehicle control unit, the embodiment further provides a vehicle, which includes the vehicle control unit described in the above embodiment.
The vehicle described in the embodiment includes, but is not limited to, a conventional fuel vehicle, a hybrid vehicle, a pure electric vehicle, and the like, and may even be an electric bicycle, and the like, or other vehicles that need to control a brake light.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (11)
1. A brake light control circuit for a vehicle, comprising:
an acceleration detection unit that detects a vehicle acceleration of the vehicle in a forward direction thereof, and outputs a first signal when the vehicle acceleration is smaller than a preset deceleration threshold, and outputs a second signal when the vehicle acceleration is larger than a preset acceleration threshold;
the switch unit is arranged between a vehicle-mounted power supply of a vehicle and a brake lamp of the vehicle, and is electrically connected with the signal output end of the acceleration detection unit;
a pedal signal input unit which is provided between the vehicle-mounted power supply and the brake lamp in parallel with the switch unit, is connected to a brake pedal of a vehicle, and receives a brake signal from the brake pedal; and is
The switch unit is electrically connected with a signal output end of the acceleration detection unit, and is used for connecting the vehicle-mounted power supply and the brake lamp according to the first signal from the acceleration detection unit and disconnecting the vehicle-mounted power supply and the brake lamp according to the second signal from the acceleration detection unit.
2. A brake light control circuit for a vehicle according to claim 1, further comprising: a hysteresis amplifying unit disposed between the acceleration detecting unit and the switching unit; wherein
One signal input end of the hysteresis amplification unit is connected with the signal output end of the acceleration detection unit, and the signal output end of the hysteresis amplification unit is connected with the switch unit; and when the hysteresis amplifying unit receives the mutual jump between the first signal and the second signal output by the acceleration detecting unit, the hysteresis amplifying unit controls the switch unit to connect or disconnect the electric connection between the vehicle-mounted power supply and the brake lamp.
3. A brake lamp control circuit of a vehicle according to claim 2, wherein the hysteresis amplifying unit includes a voltage comparator, a first hysteresis element, a second hysteresis element, a first voltage dividing element, a second voltage dividing element, and a third voltage dividing element; the non-inverting input end of the voltage comparator is the signal input end of the hysteresis amplifying unit, and the output end of the voltage comparator is the signal output end of the hysteresis amplifying unit; wherein
The first hysteresis element is arranged between the signal output end of the acceleration detection unit and the non-inverting input end of the voltage comparator;
the second hysteresis element is connected with the voltage comparator in parallel, one end of the second hysteresis element is connected with the non-inverting input end of the voltage comparator, and the other end of the second hysteresis element is connected with the output end of the voltage comparator;
one end of the first voltage division element is connected with the output end of the voltage comparator, and the other end of the first voltage division element is connected with a high level;
one end of the second voltage division element is connected with the inverting input end of the voltage comparator, and the other end of the second voltage division element is connected with the high level;
and one end of the third voltage division element is connected with the inverted input end of the voltage comparator, and the other end of the third voltage division element is grounded.
4. A brake lamp control circuit of a vehicle according to claim 3, wherein the acceleration detection unit includes an acceleration sensor and a bandwidth control element; the output end of the acceleration sensor is the signal output end of the acceleration detection unit; wherein
The power supply input end of the acceleration sensor is connected with the high level, and the output end of the acceleration sensor is connected to the hysteresis amplification unit;
the bandwidth control element is connected between the output terminal and ground.
5. The brake lamp control circuit of a vehicle according to claim 4, further comprising a power supply unit including a voltage conversion chip, an input filter element, and an output filter element; wherein
The input end of the voltage conversion chip is connected with the vehicle-mounted power supply, the output end of the voltage conversion chip is respectively connected with the power input end of the hysteresis amplification unit and the power input end of the acceleration detection unit, the voltage of the vehicle-mounted power supply is converted into the voltage corresponding to the high level, and the electric energy is transmitted to the hysteresis amplification unit and the acceleration detection unit;
the input filter element and the output filter element are connected with the voltage conversion chip in parallel; and is
One end of the input filter element is connected with the input end of the voltage conversion chip, and the other end of the input filter element is grounded;
one end of the output filter element is connected with the output end of the voltage conversion chip, and the other end of the output filter element is grounded.
6. A brake lamp control circuit of a vehicle according to claim 5, wherein the switching unit includes a field effect transistor, a triode, a fourth voltage division element, and a fifth voltage division element;
the field effect tube is arranged between the vehicle-mounted power supply and the brake lamp and is electrically connected with the triode;
the fourth voltage division element and the fifth voltage division element are arranged between the vehicle-mounted power supply and the triode in a series connection mode; wherein
One end of the fourth voltage division element is connected with one end of the fifth voltage division element and then connected to the first end of the field effect transistor;
the other end of the fourth voltage division element is connected with the vehicle-mounted power supply;
the second end of the field effect tube is connected with the vehicle-mounted power supply, and the third end of the field effect tube is connected to the stop lamp;
and the first end of the triode is connected with the signal output end of the hysteresis amplification unit, the second end of the triode is connected with the other end of the fifth voltage division element, and the third end of the triode is grounded.
7. A brake light control circuit of a vehicle according to claim 6,
the preset deceleration threshold is in the range of-0.1 g to-0.3 g;
the range of the preset acceleration threshold is 0g to 0.2 g;
the first hysteresis element and the second hysteresis element are both resistors;
the first voltage dividing element, the second voltage dividing element, the third voltage dividing element, the fourth voltage dividing element and the fifth voltage dividing element are all resistors;
the bandwidth control element is a capacitor;
the input filter element and the output filter element are both capacitors;
the field effect transistor is a P-channel MOS transistor, the first end of the field effect transistor is a grid electrode of the MOS transistor, the second end of the field effect transistor is a source electrode of the MOS transistor, and the third end of the field effect transistor is a drain electrode of the MOS transistor;
the first end of the triode is the base level of the triode, the second end of the triode is the collector of the triode, and the third end of the triode is the emitter of the triode.
8. A control method of a brake light control circuit of a vehicle according to claim 7, comprising the steps of:
s1: the acceleration detection unit acquires a vehicle acceleration of the vehicle in a forward direction thereof;
s2: the acceleration detection unit outputs a detection voltage according to the vehicle acceleration, the sensitivity of the acceleration sensor, and the bias voltage of the acceleration sensor;
s3: the hysteresis amplifying unit outputs an amplified voltage according to the detection voltage from the acceleration detecting unit;
s4: the triode controls the conduction and/or the cut-off of the field effect transistor according to the amplification voltage from the hysteresis amplification unit so as to control the connection and/or the disconnection of the vehicle-mounted power supply and the brake lamp.
9. The control method of a brake lamp control circuit of a vehicle according to claim 8, wherein in said step S2, said detection voltage is calculated according to the following formula:
V1＝S*a+Vb
where V1 is the detection voltage, S is the sensitivity of the acceleration sensor, a is the vehicle acceleration, and Vb is the bias voltage of the acceleration sensor.
10. A vehicle control unit, comprising:
a memory for storing a control program;
a processor which, when processing the control program, executes the steps of the control method of the brake light control circuit of the vehicle according to claim 8 or 9.
11. A vehicle comprising the hybrid vehicle controller of claim 10.
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