CN111674263A - Auxiliary braking method and system for vehicle - Google Patents
Auxiliary braking method and system for vehicle Download PDFInfo
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- CN111674263A CN111674263A CN202010485838.XA CN202010485838A CN111674263A CN 111674263 A CN111674263 A CN 111674263A CN 202010485838 A CN202010485838 A CN 202010485838A CN 111674263 A CN111674263 A CN 111674263A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000001133 acceleration Effects 0.000 claims description 57
- 238000011217 control strategy Methods 0.000 claims description 12
- 238000011084 recovery Methods 0.000 abstract description 18
- 238000005299 abrasion Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004134 energy conservation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
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- 238000004064 recycling Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
- B60L7/18—Controlling the braking effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18109—Braking
- B60W30/18127—Regenerative braking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Automation & Control Theory (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Regulating Braking Force (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides an auxiliary braking method and system for a vehicle, and relates to the field of vehicles. The auxiliary braking method for the vehicle comprises the steps of acquiring the electric quantity ratio of the power battery when the braking energy recovery condition is met, controlling the motor to recover the braking energy when the electric quantity ratio of the power battery is smaller than or equal to the preset electric quantity ratio, and controlling the retarder to perform auxiliary braking when the electric quantity ratio of the power battery is larger than the preset electric quantity ratio. According to the invention, the retarder or the motor is adopted to perform braking according to the electric quantity ratio of the power battery, the retarder is fully utilized to perform auxiliary braking, the abrasion of the friction plate of the brake can be greatly reduced, the service life of the friction plate is prolonged, and the safety of the whole vehicle during braking can be improved.
Description
Technical Field
The invention relates to the field of vehicles, in particular to an auxiliary braking method and an auxiliary braking system for a vehicle.
Background
In order to meet the national mandatory standards and respond to the national calls for energy conservation and emission reduction, the electric driving passenger car used in China at present usually adopts motor braking energy recovery as an auxiliary braking device of the whole car. The brake friction plate abrasion caused by conventional braking can be reduced, and the battery can be reversely charged through the wheels, the transmission system and the driving motor in the braking time period of the whole vehicle, so that the effects of brake energy recovery, energy conservation and emission reduction are achieved.
In the prior art, when a battery management system BMS monitors that a ratio SOC of a remaining power of a power battery is greater than 95%, a finished vehicle has no function of recovering braking energy (which is also a control means implemented based on a requirement of the power battery technology and a guarantee that the power battery is not damaged by reverse charging under a sufficient power), that is, the finished vehicle has no auxiliary braking system in a section from 95% of a full power to a full power. When the instrument panel displays a low-power warning of the power battery, a client is reminded of charging the power battery, the SOC is calculated according to the condition that the SOC is equal to 20% when the low-power warning is performed, and the electric quantity section of the whole vehicle without the auxiliary braking system accounts for 6.25% of the total electric quantity section of normal running, and the percentage is larger.
In addition, for a specific customer in a specific area, for example, in a long downhill section in a southwest mountain area, if the electric quantity of the power battery on the slope is sufficient and the braking energy recovery condition cannot be met, the vehicle is decelerated by completely using a conventional brake in the whole long downhill section, so that the safety risks of over-temperature of the brake, reduction or failure of the braking performance of the whole vehicle and the like are easily caused.
Disclosure of Invention
The invention aims to provide an auxiliary braking method for a vehicle, which solves the technical problem of low braking safety performance caused by incapability of fully utilizing a retarder for auxiliary braking in the prior art.
It is a further object of the first aspect of the invention to further improve the braking safety of the vehicle.
It is an object of a second aspect of the present invention to provide an auxiliary braking system for a vehicle.
According to an object of a first aspect of the present invention, there is provided an auxiliary braking method for a vehicle, comprising:
acquiring the electric quantity ratio of a power battery when a braking condition is met, wherein the electric quantity ratio is the ratio of the residual electric quantity of the power battery to the total electric quantity;
when the electric quantity ratio of the power battery is smaller than or equal to a preset electric quantity ratio, controlling a motor to recover braking energy; and
and when the electric quantity ratio of the power battery is greater than the preset electric quantity ratio, controlling the retarder to perform auxiliary braking.
Optionally, the retarder is controlled to perform auxiliary braking, specifically:
and controlling the retarder to perform auxiliary braking according to a preset control strategy according to the acceleration of the vehicle.
Optionally, controlling the retarder to perform auxiliary braking according to a preset control strategy according to the acceleration of the vehicle, specifically including:
controlling the retarder to be in a first gear for auxiliary braking;
acquiring the acceleration of the vehicle;
and when the acceleration is greater than a preset acceleration threshold value, controlling the retarder to be in a previous gear of the current gear to perform auxiliary braking.
Optionally, the method further comprises:
acquiring the acceleration of the vehicle after the braking energy of the motor is recovered; and
and controlling the retarder to perform auxiliary braking when the acceleration is greater than a preset acceleration threshold value.
Optionally, the method further comprises:
and when the acceleration is smaller than or equal to the preset acceleration threshold, controlling the retarder to be in the current gear for auxiliary braking.
Optionally, the satisfying of the braking condition is specifically:
the electronic throttle has no opening degree signal and the anti-lock system does not work.
Optionally, the preset electric quantity ratio is any value ranging from 94% to 96%.
Optionally, the preset acceleration threshold is zero.
According to the object of the second aspect of the invention, the invention also provides an auxiliary braking system for a vehicle, which comprises an acquisition unit, a power battery, a vehicle control unit, a motor and a retarder, wherein the acquisition unit, the power battery, the vehicle control unit, the motor and the retarder are connected with each other; wherein,
the acquisition unit is used for acquiring an electric quantity ratio of the power battery and sending the electric quantity ratio to the vehicle control unit when a braking condition is met, wherein the electric quantity ratio is the ratio of the residual electric quantity of the power battery to the total electric quantity;
the vehicle control unit is used for controlling the motor to recover braking energy when the electric quantity ratio of the power battery is smaller than or equal to a preset electric quantity ratio; and when the electric quantity ratio of the power battery is greater than the preset electric quantity ratio, controlling the retarder to perform auxiliary braking.
Optionally, the vehicle control unit is further configured to control the retarder to perform auxiliary braking according to a preset control strategy according to the acceleration of the vehicle.
The electric quantity ratio of the power battery is acquired when the braking condition is met, the motor is controlled to recover the braking energy when the electric quantity ratio of the power battery is smaller than or equal to the preset electric quantity ratio, and the retarder is controlled to perform auxiliary braking when the electric quantity ratio of the power battery is larger than the preset electric quantity ratio. According to the invention, the retarder or the motor is adopted to perform braking according to the electric quantity ratio of the power battery, the retarder is fully utilized to perform auxiliary braking, the abrasion of the friction plate of the brake can be greatly reduced, the service life of the friction plate is prolonged, and the safety of the whole vehicle during braking can be improved.
Further, the auxiliary braking is carried out according to the acceleration of the vehicle and a preset control strategy, and the auxiliary braking specifically comprises the steps of firstly controlling the retarder to be in the first gear for auxiliary braking, then obtaining the acceleration of the vehicle, and then controlling the retarder to be in the previous gear of the current gear for auxiliary braking when the acceleration is larger than a preset acceleration threshold. The retarder has a plurality of gears, and can adopt larger reverse torque to perform auxiliary braking on the vehicle when the acceleration of the vehicle is larger, so that the safety of the vehicle is further improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic flow diagram of an auxiliary braking method for a vehicle according to one embodiment of the present invention;
FIG. 2 is a schematic flow chart of an auxiliary braking method for a vehicle according to another embodiment of the present invention;
FIG. 3 is a schematic block diagram of an auxiliary braking system for a vehicle according to one embodiment of the present invention;
fig. 4 is a schematic structural view of an auxiliary brake system for a vehicle according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Fig. 1 is a schematic flow diagram of an auxiliary braking method for a vehicle according to one embodiment of the invention. As shown in fig. 1, in one particular embodiment, an auxiliary braking method for a vehicle generally includes the steps of:
s100, acquiring an electric quantity ratio SOC of the power battery when a braking condition is met, wherein the electric quantity ratio is the ratio of the residual electric quantity of the power battery to the total electric quantity;
s200, judging whether the electric quantity ratio SOC of the power battery is smaller than or equal to a preset electric quantity ratio, if so, executing S300; if not, executing S400;
s300, controlling the motor to recover braking energy, specifically, executing reverse torque by the motor, so as to output reverse charging current to the power battery, and realizing the function of recovering the braking energy;
and S400, controlling the retarder to perform auxiliary braking.
Here, the condition for satisfying the braking energy recovery is specifically that the electronic accelerator has no opening degree signal and the anti-lock system is not operated. That is, the motor does not perform braking energy recovery and the retarder does not perform auxiliary braking as long as either of the two conditions is not satisfied. And whether the braking condition is met or not can be judged on the premise that the handle switch of the retarder activates the braking system of the eddy current retarder.
Further, the preset electric quantity ratio is any value within the range of 94% -96%. That is, the preset electric quantity ratio is determined according to the percentage of the full electric quantity of the power battery. In a preferred embodiment, the preset electric quantity ratio is 95%, and in addition, the preset electric quantity ratio can be specifically set according to actual conditions.
According to the invention, the retarder or the motor is considered to be adopted to recover the braking energy according to the electric quantity ratio of the power battery, the braking can be carried out as long as the electric quantity of the power battery is not full, the auxiliary braking is carried out by fully utilizing the retarder, the abrasion of the friction plate of the brake can be greatly reduced, the service life of the friction plate is prolonged, and the safety of the whole vehicle during braking can be improved.
Fig. 2 is a schematic flow chart of an auxiliary braking method for a vehicle according to another embodiment of the present invention. As shown in fig. 2 and referring to fig. 1, in another embodiment, the retarder is controlled to perform auxiliary braking, specifically:
and controlling the retarder according to the acceleration of the vehicle to perform auxiliary braking according to a preset control strategy. The method specifically comprises the following steps:
s410, controlling the retarder to be in a first gear for auxiliary braking;
s420, acquiring the acceleration a of the vehicle;
s430, judging whether the acceleration a is larger than a preset acceleration threshold value a1, if so, executing S440, and if not, executing S450;
s440, controlling the retarder to be in a first-stage gear of the current gear to perform auxiliary braking; here, the previous gear refers to an upshift, for example, the current gear is first gear, and the previous gear is second gear.
And S450, controlling the retarder to be in the current gear to perform auxiliary braking.
Here, if the gear of the retarder is already raised to the highest gear, and the motor braking energy recovery torque and the retarder braking torque are later than the maximum reverse torque which can be borne by the rear axle of the vehicle, the retarder is in the current gear for auxiliary braking.
The retarder has a plurality of gears, and can adopt larger reverse torque to perform auxiliary braking on the vehicle when the acceleration of the vehicle is larger, so that the safety of the vehicle is further improved. In addition, the preset control strategy of the retarder can adjust the working gear of the retarder in real time according to the acceleration of the vehicle, so that the retarder can perform auxiliary braking at the optimal gear, and the safety of the whole vehicle during braking can be further improved.
In one embodiment, after the motor performs the braking energy recovery S300, the method further includes the following steps:
s310, acquiring the acceleration a of the vehicle, namely acquiring the acceleration of the vehicle after the braking energy of a motor of the vehicle is recovered in the braking process of the vehicle;
s320, judging whether the acceleration a is larger than a preset acceleration threshold value a1, if so, executing S410; if not, executing S330;
and S330, controlling the retarder not to perform auxiliary braking.
On one hand, if the vehicle has acceleration after the motor performs braking energy recovery, the safety of the whole vehicle braking cannot be guaranteed only through the motor, and auxiliary braking needs to be further performed through the retarder, so that the safety of the vehicle braking is guaranteed by performing the braking energy recovery through the motor and performing the auxiliary braking through the retarder.
On the other hand, the power battery can be charged through the motor, and meanwhile, the auxiliary braking can be executed without the intervention of a retarder under the condition of the braking safety of the whole vehicle, so that the use frequency of the retarder is reduced, and the service life of the retarder is prolonged.
Here, the preset acceleration threshold is zero, and in addition, the preset acceleration threshold may be specifically set according to actual requirements.
The invention adds an eddy current retarder system as a vehicle auxiliary braking system to assist the vehicle in auxiliary braking under the condition of no braking energy recovery or long downhill. According to the invention, after the braking energy of the motor is recovered, whether a retarder is needed to intervene is selected according to the acceleration of the vehicle, and auxiliary braking is carried out according to a preset control strategy, so that the abrasion of a friction plate of the brake can be greatly reduced, the service life of the friction plate is prolonged, and the safety of the whole vehicle during braking can be improved.
Fig. 3 is a schematic configuration diagram of an auxiliary brake system 100 for a vehicle according to one embodiment of the present invention, and fig. 4 is a schematic configuration diagram of the auxiliary brake system 100 for a vehicle according to another embodiment of the present invention. As shown in fig. 3-4, in one particular embodiment, an auxiliary braking system 100 for a vehicle includes an acquisition unit 2, a power battery 1, a vehicle control unit 3, a motor 6, and a retarder 7 connected to each other; the acquisition unit 2 is used for acquiring an electric quantity ratio of the power battery 1 when a braking condition is met and sending the electric quantity ratio to the vehicle control unit 3, wherein the electric quantity ratio is a ratio of the residual electric quantity of the power battery 1 to the total electric quantity. The vehicle control unit 3 is used for controlling the motor 6 to recover braking energy when the electric quantity ratio of the power battery 1 is less than or equal to a preset electric quantity ratio; and when the electric quantity ratio of the power battery 1 is larger than the preset electric quantity ratio, the retarder 7 is controlled to perform auxiliary braking. When the motor 6 is required to recover braking energy, the vehicle control unit 3 sends a control signal to the motor controller 4, and the motor controller 4 controls the motor 6 to recover the braking energy. When the retarder 7 is needed to perform auxiliary braking, the vehicle control unit 3 sends a control signal to the retarder controller 5, and the retarder controller 5 controls the retarder 7 to perform auxiliary braking.
According to the invention, the retarder 7 or the motor 6 is adopted to perform braking according to the electric quantity ratio of the power battery 1, the retarder is fully utilized to perform auxiliary braking, the abrasion of a friction plate of the brake can be greatly reduced, the service life of the friction plate is prolonged, and the safety of the whole vehicle during braking can be improved.
Specifically, the retarder 7 is controlled to perform auxiliary braking, specifically:
and controlling the retarder 7 according to the acceleration of the vehicle to perform auxiliary braking according to a preset control strategy.
In another embodiment, the acquisition unit 2 is further configured to acquire the acceleration of the vehicle after the braking energy recovery of the motor 6 and send the acceleration to the vehicle controller 3. The vehicle control unit 3 is further configured to control the retarder 7 to perform auxiliary braking according to a preset control strategy when the acceleration a is determined to be greater than the preset acceleration threshold a 1.
In addition, the vehicle control unit 3 is further configured to control the retarder 7 not to perform auxiliary braking when the acceleration a is determined to be less than or equal to the preset acceleration threshold a 1.
Specifically, the acquisition unit 2 includes a Battery Management System (BMS)21 for acquiring a capacity ratio of the power battery 1, and an acceleration sensor (not shown in the figure) for detecting an acceleration of the vehicle. In addition, the acquisition unit 2 is also used for detecting whether the electronic accelerator has no opening degree signal and whether an anti-lock system works and feeding back to the vehicle control unit 3.
By arranging the retarder 7, the invention can utilize the retarder 7 to carry out auxiliary braking to the greatest extent to decelerate the vehicle when a long downhill road section is in a mountainous area, thereby greatly reducing the working pressure of conventional brake braking when the long downhill road section is in the long downhill road section and greatly improving the braking safety performance of the whole vehicle.
Further, the retarder control system comprises a handle switch 8 which is arranged at a position close to a steering wheel, when the handle switch 8 is turned on, the retarder controller 5 receives a gear request sent by the vehicle controller 3 and then adjusts the gear of the retarder 7 to output reverse torque, meanwhile, the gear of the retarder 7 at the moment is displayed on a panel indicator lamp, and the panel indicator lamp is arranged at an instrument panel.
In one embodiment, when determining that the acceleration a is greater than the preset acceleration threshold a1, the vehicle control unit 3 controls the retarder 7 to be in the first gear for auxiliary braking; then, judging whether the acceleration a is larger than a preset acceleration threshold value a1 in a recycling manner, and if so, controlling the retarder 7 to be in a previous gear of the current gear to perform auxiliary braking; if not, the retarder 7 is controlled to be in the current gear for auxiliary braking.
When the gear of the retarder 7 is already raised to the highest gear, and the motor braking energy recovery torque and the retarder braking torque are larger than the maximum reverse torque which can be borne by the rear axle of the vehicle, the retarder 7 is in the current gear to recover the braking energy.
Specifically, the acceleration in this application refers to the current vehicle speed V0And the vehicle speed V after 1 second1For comparison, if V1－V0Less than or equal to 0, namely the braking energy recovery of the motor 6 can meet the requirement,the vehicle control unit 3 does not send an auxiliary braking command for opening the retarder 7 to the retarder controller 5; if V1－V0If the speed is more than 0, namely the energy recovery of the motor 6 can not meet the requirement, the vehicle controller 3 sends an auxiliary braking command for starting the retarder 7 to the retarder controller 5 and continues to pass through the current vehicle speed V0And the vehicle speed V after 1 second1And (4) carrying out logic judgment to enable the retarder 7 to be always in a proper gear, so that the retarder 7 can be better utilized.
The invention combines two braking systems of a motor 6 braking energy recovery system and a retarder 7, the two braking systems are not completely independent, and the two braking systems supplement each other through the control method in the invention, namely, the retarder 7 can be started for auxiliary braking under the condition of no braking energy recovery, and the retarder 7 intervenes for braking under the condition of insufficient braking recovery energy when a long downhill road section is in a mountain area, thereby helping the whole vehicle to decelerate, effectively reducing the working pressure of the brake of the whole vehicle and greatly prolonging the service life of a friction plate of the brake.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. An auxiliary braking method for a vehicle, characterized by comprising:
acquiring the electric quantity ratio of a power battery when a braking condition is met, wherein the electric quantity ratio is the ratio of the residual electric quantity of the power battery to the total electric quantity;
when the electric quantity ratio of the power battery is smaller than or equal to a preset electric quantity ratio, controlling a motor to recover braking energy; and
and when the electric quantity ratio of the power battery is greater than the preset electric quantity ratio, controlling the retarder to perform auxiliary braking.
2. An auxiliary braking method according to claim 1, characterized by controlling the retarder for auxiliary braking, in particular:
and controlling the retarder to perform auxiliary braking according to a preset control strategy according to the acceleration of the vehicle.
3. The auxiliary braking method according to claim 2, wherein the retarder is controlled to perform auxiliary braking according to a preset control strategy according to the acceleration of the vehicle, and specifically comprises:
controlling the retarder to be in a first gear for auxiliary braking;
acquiring the acceleration of the vehicle;
and when the acceleration is greater than a preset acceleration threshold value, controlling the retarder to be in a previous gear of the current gear to perform auxiliary braking.
4. The auxiliary braking method according to claim 1, characterized by further comprising:
acquiring the acceleration of the vehicle after the braking energy of the motor is recovered; and
and controlling the retarder to perform auxiliary braking when the acceleration is greater than a preset acceleration threshold value.
5. The auxiliary braking method according to claim 3, characterized by further comprising:
and when the acceleration is smaller than or equal to the preset acceleration threshold, controlling the retarder to be in the current gear for auxiliary braking.
6. Auxiliary braking method according to claim 1, characterized in that the satisfying of the braking conditions is in particular:
the electronic throttle has no opening degree signal and the anti-lock system does not work.
7. Auxiliary braking method according to claim 1,
the preset electric quantity ratio is any value within the range of 94% -96%.
8. Auxiliary braking method according to claim 3,
the preset acceleration threshold is zero.
9. An auxiliary braking system for a vehicle is characterized by comprising a collection unit (2), a power battery (1), a vehicle control unit (3), a motor (6) and a retarder (7) which are connected with each other; wherein,
the acquisition unit (2) is used for acquiring an electric quantity ratio of the power battery (1) when a braking condition is met and sending the electric quantity ratio to the vehicle control unit (3), wherein the electric quantity ratio is the ratio of the residual electric quantity of the power battery (1) to the total electric quantity;
the vehicle control unit (3) is used for controlling the motor (6) to recover braking energy when the electric quantity ratio of the power battery (1) is smaller than or equal to a preset electric quantity ratio; and when the electric quantity ratio of the power battery (1) is larger than the preset electric quantity ratio, the retarder (7) is controlled to perform auxiliary braking.
10. The auxiliary braking system of claim 9,
and the vehicle control unit (3) is also used for controlling the retarder (7) to perform auxiliary braking according to a preset control strategy according to the acceleration of the vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010485838.XA CN111674263A (en) | 2020-06-01 | 2020-06-01 | Auxiliary braking method and system for vehicle |
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| CN202010485838.XA CN111674263A (en) | 2020-06-01 | 2020-06-01 | Auxiliary braking method and system for vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113619549A (en) * | 2021-08-10 | 2021-11-09 | 湖南三一华源机械有限公司 | Vehicle brake control system, vehicle, and control method of vehicle brake control system |
| CN113665374A (en) * | 2021-09-28 | 2021-11-19 | 潍柴动力股份有限公司 | Vehicle speed control method, device, equipment and storage medium |
| CN115489498A (en) * | 2022-09-01 | 2022-12-20 | 中联重科股份有限公司 | Control method and control device for engineering vehicle, processor and engineering vehicle |
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| CN109823188A (en) * | 2019-01-10 | 2019-05-31 | 乾碳国际公司 | The mixed gentle speed system of dynamic commercial vehicle regenerative braking |
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