CN201859318U - Automotive throttle mis-treading determination and safety control circuit - Google Patents

Abstract

The utility model discloses an automobile gas pedal misstep discrimination and its safety control circuit, which is composed of a discrimination circuit and a signal conversion circuit, and is characterized in that the discrimination circuit includes signal amplitude discrimination, signal change speed discrimination and signal duration discrimination; Input into the signal amplitude discrimination circuit and the signal change speed discrimination circuit, the output ends of the above two circuits are connected with the signal duration discrimination circuit, the output terminals of the signal amplitude discrimination circuit, the signal change speed discrimination circuit and the signal duration discrimination circuit The first AND gate circuit is connected to the input end of the signal conversion circuit, and the output end of the signal conversion circuit is connected to the throttle output signal control line. Its remarkable effect is: the multi-channel signal abnormality judging circuit is set, which can effectively and automatically judge whether the driver stepped on the gas pedal by mistake, the probability of wrong judgment is small, the circuit performance is stable, the circuit structure is simple, the cost is low, the degree of automation is high, and the response is sensitive and quick.

Description

Discrimination and safety control circuit of automobile accelerator pedal misstepping

technical field

The utility model belongs to the technical field of vehicle safety control, and in particular relates to an automobile gas pedal misstepping judgment and a safety control circuit thereof.

Background technique

With the development of society and the improvement of people's living standards, more and more cars have entered the families of ordinary people. The safety problem of car driving is also becoming more and more obvious, especially the traffic accidents caused by the driver's misoperation in the driving process occur frequently, which has aroused great concern from the society.

As far as the structural layout of automobiles on the market is concerned, the accelerator pedal and the brake pedal are controlled alternately by one foot, which easily causes the driver to mistake the accelerator pedal for the brake pedal in an emergency. use, resulting in traffic accidents.

In the prior art, there are also some patents for preventing the driver from accidentally stepping on the accelerator when braking, such as a kind of emergency brake mechanism for accidentally stepping on the accelerator announced by the publication number CN201240369, which brakes by mechanical transmission, and the reaction speed is relatively fast. slow. There are also brakes controlled by electricity, such as the emergency braking device disclosed in Chinese patent 200920127769. processing, and finally through the solenoid valve to control the opening of the throttle nozzle, and finally achieve the braking effect.

The shortcoming of prior art is: adopt electrical control, although braking speed has improved, but when single-chip computer judges that stepping on gas pedal by mistake only selects accelerator pedal movement acceleration as reference standard, sensor signal will be disturbed usually, makes the single-chip computer judgment process cause Misoperation, unstable working status.

Utility model content

The purpose of the utility model is to overcome the defect that only a single judgment signal is used in the prior art, which is easy to cause wrong judgments, and proposes a kind of automobile accelerator misstep judgment and its safety control circuit. the

In order to achieve the above object, the utility model adopts the following scheme:

A kind of automobile gas pedal misstep discrimination and its safety control circuit, which is composed of a discrimination circuit and a signal conversion circuit, characterized in that: the discrimination circuit includes a signal amplitude discrimination circuit, a signal change speed discrimination circuit and a signal duration discrimination circuit, the The output terminals of the signal amplitude discrimination circuit, the signal change speed discrimination circuit and the signal duration discrimination circuit are respectively connected to the three input terminals of the first AND gate circuit, and the output terminals of the first AND gate circuit are connected to the signal conversion circuit, The output terminal of the signal conversion circuit is connected with the throttle output signal control line;

The input terminal of the signal amplitude discrimination circuit is connected to the throttle input signal line, and its output terminal is connected to the first input terminal of the signal duration discrimination circuit;

The input end of the signal change speed judging circuit is also connected to the accelerator input signal line, and the output end is connected to the second input end of the signal duration judging circuit.

The throttle signal can be uploaded to the throttle input signal line through some existing mature technologies, for example, using a displacement sensor or the acceleration sensor mentioned in the background art. When the driver steps on the accelerator normally, the force is applied slowly, and the amplitude of the accelerator input signal is greater than the reference voltage value, so a high-level signal will be output after passing through the signal amplitude discrimination circuit. But when stepping on the accelerator slowly, the change speed of its accelerator signal is very slow, so the signal change speed discrimination circuit will output a low-level signal, and the signal amplitude discrimination circuit and the signal change speed discrimination circuit are input into the signal duration discrimination circuit. If the time requirement cannot be met, the signal duration discrimination circuit will also output a low-level signal, and the above three output signals are input to the signal conversion circuit after passing through the first AND gate circuit. Since it is a low-level signal input, the signal conversion The circuit does not convert the throttle signal, and its output terminal outputs a normal throttle control signal to the throttle control circuit.

If the driver mistakenly presses the accelerator as the brake in an emergency, the force will be very strong, and the amplitude of the accelerator signal will not only exceed the preset reference voltage, but also the accelerator signal will reach the threshold in a very short time, and the signal changes The speed is very fast, and often the driver will step on the accelerator to the bottom when accidentally stepping on it in an emergency, and it will last for a certain period of time. Therefore, after the accelerator signal input signal amplitude discrimination circuit and the signal change speed discrimination circuit will output a high level signal, the signal The signals output by the amplitude discrimination circuit and the signal change speed discrimination circuit will also output a high-level signal after passing through the signal duration discrimination circuit, and the above three high-level signals are also a same after passing through the first AND gate circuit. The high-level signal is input to the signal conversion circuit. When the signal conversion circuit receives a high-level input signal, it will convert the input throttle signal into an idle throttle signal, and finally input the idle throttle signal to the throttle output signal control line Control the opening of the accelerator to keep the car in the idle state, and also use the idle accelerator signal to control the electronic brake device, and finally make the car achieve the effect of braking and deceleration.

The signal amplitude discrimination circuit is provided with a first voltage comparator and a power supply, the non-inverting input terminal of the first voltage comparator is connected to the throttle input signal line, and its inverting input terminal is connected to the power supply through a second resistor, The inverting input terminal of the first voltage comparator is also grounded through the third resistor, and the output terminal of the first voltage comparator is the output terminal of the signal amplitude discrimination circuit.

After the power supply is divided by the second resistor and the third resistor, the inverting reference voltage of the first voltage comparator is obtained. When the amplitude of the throttle input signal is greater than the inverting reference voltage, the first voltage comparator outputs a high level value, When the amplitude of the throttle input signal is smaller than the inverting reference voltage, the first voltage comparator outputs a low level value.

The signal change speed discrimination circuit is provided with a second voltage comparator, and the throttle input signal line is connected to the positive phase input terminal of the second voltage comparator after connecting the first capacitor, and the positive phase input terminal of the second voltage comparator is The input terminal is also grounded through the fifth resistor, the inverting input terminal of the second voltage comparator is connected to the power supply through the sixth resistor, the inverting input terminal of the second voltage comparator is also grounded through the seventh resistor, and the inverting input terminal of the second voltage comparator is also grounded through the seventh resistor. The output terminals of the two voltage comparators are the output terminals of the signal changing speed discrimination circuit.

The first capacitor and the fifth resistor form a differential circuit. When the accelerator pedal is stepped on by mistake, the input accelerator signal changes suddenly, and the first capacitor in the differential circuit is suddenly charged to saturation, so that the voltage of the positive phase input terminal of the second voltage comparator The level is higher than the reference voltage of the inverting input terminal, and the second voltage comparator outputs a high level signal. If the accelerator pedal is stepped on slowly, the accelerator signal changes slowly, and the capacitor in the differential circuit will discharge after being charged, so that the level value of the non-inverting input terminal of the second voltage comparator is always lower than the reference voltage of the inverting input terminal, and the second voltage comparator Output low level signal.

The signal duration discrimination circuit is provided with a second AND gate circuit, a first relay and a third voltage comparator;

The two input terminals of the second AND gate circuit are respectively the first input terminal and the second input terminal of the signal duration discrimination circuit;

The first input terminal of the first relay is connected to the output terminal of the second AND gate circuit, the second input terminal is grounded, the first power supply terminal is connected to the power supply, and the output terminal is connected to the positive phase of the third voltage comparator through the ninth resistor. input connection;

The non-inverting input terminal of the third voltage comparator is also grounded through the second capacitor, the inverting input terminal is connected to the power supply through the tenth resistor, and the inverting input terminal of the third voltage comparator is also grounded through the eleventh resistor, Its output terminal is the output terminal of the signal duration discrimination circuit.

When both the amplitude of the throttle signal and the speed of change of the throttle signal exceed the limit, the first voltage comparator and the second voltage comparator both output high-level signals, and the above two high-level signals are still one after passing through the second AND gate circuit. High-level signal, when the second port of the first relay receives the high-level signal, its first port will be connected to the fourth port, so that the voltage value output by the first port is equal to the value of the power supply. The ninth resistor and the second capacitor form a set of RC timing circuits, and the time constant , when the time when the first port of the first relay outputs a high level reaches the timing time of the timing circuit, the voltage value at both ends of the second capacitor after charging is greater than the inverting input of the third voltage comparator The reference voltage at the terminal makes the third voltage comparator output a high level signal.

The signal conversion circuit is a second relay, the first input end of the second relay is connected to the output end of the first AND gate circuit, the second input end is grounded, the first power supply end is connected to a reference voltage source, and the second power supply The terminal is connected to the throttle input signal line, and the output terminal is connected to the throttle signal output control line.

The internal structures of the first relay and the second relay are the same, and both are provided with a coupling coil and a switching switch;

One end of the coupling coil is used as a first input end, and the other end of the coupling coil is used as a second input end;

The fixed terminal of the switch is used as the output terminal, and the two movable terminals of the switch are respectively used as the first power supply terminal and the second power supply terminal.

When the three high-level signals of the signal amplitude judging circuit, the signal change speed judging circuit and the signal duration judging circuit are input into the first AND gate circuit at the same time, it is considered that the driver stepped on the accelerator by mistake, and the first AND The gate circuit will output a high-level signal to the first input terminal of the second relay, so that the output terminal of the second relay is connected to the first power supply terminal, and the output level value is the value of the reference voltage source, In this way, the throttle control circuit or brake circuit of the rear stage is controlled to work, so as to achieve the purpose of decelerating the vehicle.

The remarkable effect of the utility model is: a kind of automobile gas pedal misstepping judgment and its safety control circuit are proposed, and a multi-channel signal abnormal judging circuit is set, which can effectively and automatically judge whether the driver belongs to mistaken stepping on the gas pedal, and the probability of misjudgment is small, and the circuit Stable performance; the circuit structure adopted by the utility model is simple and low in cost. Most of them choose separate analog components and simple digital gate circuits, which have a high degree of automation and quick response. the

Description of drawings

Fig. 1 is the circuit principle block diagram of the present utility model;

Fig. 2 is the schematic circuit diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figures 1 and 2: a car accelerator misstep discrimination and its safety control circuit, composed of a discrimination circuit 1 and a signal conversion circuit 2, the discrimination circuit 1 includes a signal amplitude discrimination circuit 1a, a signal change speed discrimination circuit 1b And signal duration discrimination circuit 1c;

Voltage comparators have been used in the signal amplitude discrimination circuit 1a, signal change speed discrimination circuit 1b and signal duration discrimination circuit 1c, and the inventor has selected two chip models as dual voltage comparators of LM393D in the specific implementation process , wherein pins 1, 2, 3, 4 and 8 of the first LM393D chip form the first voltage comparator U1A, pins 4, 5, 6, 7 and 8 of the first LM393D chip form the second voltage comparator U1B, Pins 1, 2, 3, 4 and 8 of the second LM393D chip form a third voltage comparator U4A.

The first pin of the first LM393D chip is used as the output terminal of the signal amplitude discrimination circuit 1a, the second pin is connected to the power supply VCC through the second resistor R2, the third pin is connected to the throttle input signal line, and the second pin is connected to the throttle input signal line. 4 pins are grounded, a third resistor R3 is connected in series between the 2nd pin and the 4th pin, and the throttle input signal line is also connected to the 5th pin through the first capacitor C1, and the 5th pin is also connected in series The fifth resistor R5 is grounded, the sixth pin is also connected to the power supply VCC through the sixth resistor R6, and a seventh resistor R7 is connected in series between the sixth pin and the fourth pin, and the seventh pin is used as the The output port of the signal change speed discrimination circuit 1b, the 8th pin is connected to the power supply VCC, the first resistor R1 is also connected in series between the 8th pin and the 1st pin, and the 8th pin and the 7th tube A fourth resistor R4 is also connected in series between the pins.

The signal duration discrimination circuit 1c is also provided with a second AND gate circuit U6A and a first relay U5, wherein the second AND gate circuit U6A adopts a SN74LS08D four-two input AND gate chip, and the first pin of the SN74LS08D chip is connected to The first pin of the first LM393D chip is connected, the second pin is connected to the seventh pin of the first LM393D chip, and the third pin is connected to the first input end of the first relay U5, The first power terminal of the first relay U5 is connected to the power supply VCC, the second input terminal is grounded, and the output port is connected to the third pin of the second LM393D chip through the ninth resistor R9.

The third pin of the second LM393D chip is also connected in series with the second capacitor C2 and grounded, the second pin is connected to the power supply VCC through the tenth resistor R10, the fourth pin is grounded, and the eighth pin is connected to the power supply VCC. Pin 1 is used as the output port of the signal duration discrimination circuit 1c, an eleventh resistor R11 is connected in series between the second pin and the fourth pin, and an eleventh resistor R11 is connected in series between the eighth pin and the first pin. An eighth resistor R8 is connected in series.

The output terminals of the signal amplitude discrimination circuit 1a, the signal change speed discrimination circuit 1b and the signal duration discrimination circuit 1c are connected to the input terminal of the signal conversion circuit 2 through the first AND gate circuit U3A, and the output terminal of the signal conversion circuit 2 is Connect to the throttle output signal control line.

In a specific embodiment, the 1, 2, 12 and 13 pins of the SN74LS11D three-three input AND gate chip are used to form the first AND gate circuit U3A, that is, the first pin of the SN74LS11D chip and the first LM393D Connect the 1st pin of the chip, connect the 2nd pin of the SN74LS11D chip with the 7th pin of the first LM393D chip, connect the 13th pin of the SN74LS11D chip with the 1st pin of the second LM393D chip To connect, connect the 12th pin of the SN74LS11D chip to the input end of the signal conversion circuit 2.

The signal conversion circuit 2 is provided with a second relay U2, the first input terminal of the second relay U2 is connected to the output terminal of the first AND gate circuit U3A, the second input terminal is grounded, and the first power supply terminal is connected to the reference voltage The source VCC1.6, the second power terminal is connected to the throttle input signal line, and the output terminal is connected to the throttle signal output control line.

The internal structures of the first relay U5 and the second relay U2 are the same, and both are provided with a coupling coil and a switching switch, wherein one end of the coupling coil is used as the first input terminal, and the other end of the coupling coil is used as the second input terminal, and the switching coil is used as the second input terminal. The fixed terminal is used as an output terminal, and the two movable terminals of the switch are respectively used as a first power supply terminal and a second power supply terminal.

The working principle of the utility model is: the throttle signal can be uploaded to the throttle input signal line through some existing mature technologies such as a displacement sensor or an acceleration sensor. When the driver steps on the accelerator normally, the force is applied slowly, and the amplitude of the accelerator input signal is greater than the reference voltage value, so a high-level signal will be output after passing through the signal amplitude discrimination circuit 1a. But when stepping on the accelerator slowly, the change speed of its accelerator signal is very slow, so the signal change speed discrimination circuit 1b will output a low level signal, and the signal amplitude discrimination circuit 1a and the signal change speed discrimination circuit 1b input to the signal duration discrimination The time requirement cannot be satisfied in the circuit 1c, and the signal duration discrimination circuit 1c will also output a low-level signal, and the above three output signals are input to the signal conversion circuit 2 after passing through the first AND circuit U3A. Level signal input, the signal conversion circuit 2 will not convert the throttle signal, and its output terminal outputs a normal throttle control signal to the throttle control circuit.

If the driver mistakenly presses the accelerator as the brake in an emergency, the force will be very strong, and the amplitude of the accelerator signal will not only exceed the preset reference voltage, but also the accelerator signal will reach the threshold in a very short time, and the signal changes The speed is very fast, and often the driver will step on the accelerator to the bottom when accidentally stepping on it in an emergency, and it will last for a certain period of time. Therefore, after the accelerator signal is input to the signal amplitude discrimination circuit 1a and the signal change speed discrimination circuit 1b, a high level signal will be output, so The signals output by the signal amplitude discrimination circuit 1a and the signal change speed discrimination circuit 1b will also output a high-level signal after passing through the signal duration discrimination circuit 1c, and the above three high-level signals pass through the first AND gate After the circuit U3A, a high-level signal is also input into the signal conversion circuit 2. When the signal conversion circuit 2 receives a high-level input signal, it will convert the input throttle signal into an idle throttle signal, and finally the idle throttle signal The signal is input to the accelerator output signal control line to control the opening of the accelerator, so that the car is in an idle state, and the idle accelerator signal can also be used to control the electronic brake device, and finally the car achieves the effect of braking and deceleration.

Claims (6)

1. An automobile accelerator pedal misstep discrimination and its safety control circuit, composed of a discrimination circuit (1) and a signal conversion circuit (2), characterized in that: the discrimination circuit (1) includes a signal amplitude discrimination circuit (1a), The signal change speed discrimination circuit (1b) and the signal duration discrimination circuit (1c), the output ends of the signal amplitude discrimination circuit (1a), the signal change speed discrimination circuit (1b) and the signal duration discrimination circuit (1c) are respectively connected to On the three input terminals of the first AND gate circuit (U3A), the output terminal of the first AND gate circuit (U3A) is connected to the signal conversion circuit (2), and the output terminal of the signal conversion circuit (2) is connected to the throttle Output signal control line connection; The input terminal of the signal amplitude discrimination circuit (1a) is connected to the throttle input signal line, and the output terminal thereof is connected to the first input terminal of the signal duration discrimination circuit (1c); The input terminal of the signal change speed discrimination circuit (1b) is also connected to the accelerator input signal line, and the output terminal thereof is connected to the second input terminal of the signal duration discrimination circuit (1c). 2. The circuit for judging false accelerator pedal stepping and its safety control circuit according to claim 1, characterized in that: said signal amplitude judging circuit (1a) is provided with a first voltage comparator (U1A) and a power supply (VCC), so The non-inverting input terminal of the first voltage comparator (U1A) is connected to the throttle input signal line, and the inverting input terminal is connected to the power supply (VCC) through the second resistor (R2). The first voltage comparator ( The inverting input terminal of U1A) is also grounded through the third resistor (R3), and the output terminal of the first voltage comparator (U1A) is the output terminal of the signal amplitude discrimination circuit (1a). 3. The automobile accelerator pedal misstepping judgment and its safety control circuit according to claim 1, characterized in that: the signal change speed judgment circuit (1b) is provided with a second voltage comparator (U1B), and the accelerator pedal input signal The first capacitor (C1) of the line string is connected to the non-inverting input terminal of the second voltage comparator (U1B), and the non-inverting input terminal of the second voltage comparator (U1B) is also grounded through the fifth resistor (R5) , the inverting input terminal of the second voltage comparator (U1B) is connected to the power supply (VCC) through the sixth resistor (R6), and the inverting input terminal of the second voltage comparator (U1B) is also connected through the seventh resistor ( R7) is grounded, and the output terminal of the second voltage comparator (U1B) is the output terminal of the signal change speed discrimination circuit (1b). 4. The automobile accelerator pedal misstepping judgment and its safety control circuit according to claim 1, characterized in that: the signal duration judgment circuit (1c) is provided with a second AND gate circuit (U6A), a first relay (U5 ) and a third voltage comparator (U4A); The two input terminals of the second AND gate circuit (U6A) are respectively the first input terminal and the second input terminal of the signal duration discrimination circuit (1c); The first input terminal of the first relay (U5) is connected to the output terminal of the second AND gate circuit (U6A), the second input terminal is connected to the ground, the first power supply terminal is connected to the power supply (VCC), and the output terminal is connected to the ninth resistor (R9 ) is connected to the non-inverting input terminal of the third voltage comparator (U4A); The non-inverting input terminal of the third voltage comparator (U4A) is also grounded through the second capacitor (C2), and the inverting input terminal is connected to the power supply (VCC) through the tenth resistor (R10). The third voltage comparator ( The inverting input terminal of U4A) is also grounded through the eleventh resistor (R11), and its output terminal is the output terminal of the signal duration discrimination circuit (1c). 5. The circuit for judging wrong stepping on the accelerator pedal of an automobile and its safety control circuit according to claim 1, characterized in that: the signal conversion circuit (2) is a second relay (U2), and the first relay (U2) of the second relay (U2) The input terminal is connected to the output terminal of the first AND gate circuit (U3A), the second input terminal is grounded, the first power supply terminal is connected to the reference voltage source (VCC1.6), and the second power supply terminal is connected to the throttle input signal line, The output terminal is connected to the throttle signal output control line. 6. According to claim 4 or 5, the judgment and safety control circuit of automobile accelerator pedal misstepping is characterized in that: the internal structure of the first relay (U5) and the second relay (U2) are the same, and both are provided with a coupling Coils and toggle switches; One end of the coupling coil is used as a first input end, and the other end of the coupling coil is used as a second input end; The fixed terminal of the switch is used as the output terminal, and the two movable terminals of the switch are respectively used as the first power supply terminal and the second power supply terminal.

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