CN112193076A - Electric automobile braking energy recovery device and method and electric automobile - Google Patents
Electric automobile braking energy recovery device and method and electric automobile Download PDFInfo
- Publication number
- CN112193076A CN112193076A CN202011230129.3A CN202011230129A CN112193076A CN 112193076 A CN112193076 A CN 112193076A CN 202011230129 A CN202011230129 A CN 202011230129A CN 112193076 A CN112193076 A CN 112193076A
- Authority
- CN
- China
- Prior art keywords
- load
- vehicle
- braking energy
- energy recovery
- condition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Regulating Braking Force (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The utility model relates to an electric automobile braking energy recovery device and a recovery method, and an electric automobile, wherein the electric automobile braking energy recovery device comprises a multi-gear switch (1) which is provided with at least two gears and is configured to select different load working conditions of the automobile by receiving external operation, the at least two gears correspond to different load working condition grades one by one, and the load intervals corresponding to different load working conditions are different; and the vehicle control unit (3) is electrically connected with the multi-gear switch (1) and is configured to match the load working condition selected by the multi-gear switch (1) with a preset working condition-brake feedback parameter corresponding relation so as to obtain the brake feedback parameter of the vehicle under the current load working condition, and the vehicle is enabled to carry out brake energy recovery according to the determined brake feedback parameter.
Description
Technical Field
The disclosure relates to the technical field of automobile energy recovery, in particular to an electric automobile braking energy recovery device and method and an electric automobile.
Background
A large amount of kinetic energy is lost in the braking process of the automobile and converted into heat energy, if part of the kinetic energy is recycled in a braking energy feedback mode, the electric energy consumption can be saved, the endurance mileage of the pure electric automobile can be improved, and the braking energy feedback is reasonably utilized and is an effective method.
The current braking energy feedback mode is simple, especially under the condition that some electric vehicle brake pedals do not have a brake pedal angle analog quantity sensor, the electric vehicle brake pedals can only be selectively switched on and off through a brake switch, the setting and the change interval of the feedback parameter values are severely limited, and the feedback braking effect of the vehicle under the conditions of different loads, gradients and treading depths cannot be more suitable for the driving requirements of a driver, the feedback power and the torque.
In this way, a calibration parameter which is relatively compromised can be usually selected only for the vehicle through a calibration mode, and the adaptability of the brake feedback to full load, no load and various working conditions is insufficient, so that various problems such as insufficient brake risk, too hard braking, discomfort, weak feedback effect and the like can be caused.
Disclosure of Invention
The embodiment of the disclosure provides an electric automobile braking energy recovery device and method and an electric automobile, which can enhance the braking energy recovery effect of the electric automobile.
The first aspect of the present disclosure provides an electric vehicle braking energy recovery device, including:
the multi-gear switch is provided with at least two gears and is configured to select different load working conditions of the vehicle by receiving external operation, the at least two gears correspond to different load working condition grades one by one, and load intervals corresponding to different load working conditions are different; and
and the vehicle control unit is electrically connected with the multi-gear switch and is configured to match the load working condition selected by the multi-gear switch with a preset working condition-brake feedback parameter corresponding relation so as to obtain the brake feedback parameter of the vehicle under the current load working condition, and the vehicle is enabled to carry out brake energy recovery according to the determined brake feedback parameter.
In some embodiments, the different load conditions include a first load condition, a second load condition, and a third load condition, the first load condition corresponding to a first load interval, the second load condition corresponding to a second load interval, and the third load condition corresponding to a third load interval; wherein the minimum value of the first load interval is smaller than the minimum value of the second load interval, and the maximum value of the first load interval is smaller than the maximum value of the second load interval; the minimum value of the second load interval is smaller than the minimum value of the third load interval, and the maximum value of the second load interval is smaller than the maximum value of the third load interval.
In some embodiments, the electric vehicle braking energy recovery device further comprises a message converter, and the multi-gear switch is connected with the vehicle control unit through the message converter; or
The switch contacts corresponding to at least two gears of the multi-gear switch are directly connected with at least two signal input interfaces of the vehicle controller in a one-to-one correspondence mode through hard wires.
In some embodiments, the vehicle control unit is configured to enable the vehicle to perform braking energy recovery according to the calibrated braking feedback parameters under the preset reference working condition under the condition that the multi-gear switching signal is not successfully received.
In some embodiments, the electric vehicle braking energy recovery device further comprises a motor controller configured to control the driving motor to operate in a generator mode to generate electric energy by regenerative braking of the kinetic energy of the vehicle for charging the power battery;
the vehicle control unit is configured to determine reasonable brake feedback parameters under the current load working condition by combining the running speed, the gradient and the battery state parameters of the vehicle and the preset limit brake feedback parameters in the motor controller on the basis of the current load working condition.
In some embodiments, the hybrid vehicle controller is configured to stop braking energy recovery in the event of an anti-lock braking system of the vehicle being activated.
The second aspect of the present disclosure provides an electric vehicle, including the braking energy recovery device of the electric vehicle of the above embodiment.
The third aspect of the present disclosure provides a method for recovering braking energy of an electric vehicle, including:
the method comprises the following steps that different load working conditions of a vehicle are selected by receiving external operation through a multi-gear switch, the multi-gear switch is provided with at least two gears, the at least two gears correspond to different load working condition grades one by one, and load intervals corresponding to different load working conditions are different; and
matching the load working condition selected by the multi-gear switch with a corresponding relation of preset working condition-brake feedback parameter through the vehicle controller so as to determine reasonable brake feedback parameter of the vehicle under the current load working condition;
and the vehicle recovers the braking energy according to the determined braking feedback parameters.
In some embodiments, the different load conditions include a first load condition, a second load condition, and a third load condition, the first load condition corresponding to a first load interval, the second load condition corresponding to a second load interval, and the third load condition corresponding to a third load interval; wherein the minimum value of the first load interval is smaller than the minimum value of the second load interval, and the maximum value of the first load interval is smaller than the maximum value of the second load interval; the minimum value of the second load interval is smaller than the minimum value of the third load interval, and the maximum value of the second load interval is smaller than the maximum value of the third load interval.
In some embodiments, further comprising:
and judging whether the vehicle controller successfully receives the multi-gear switching signal or not, and if not, enabling the vehicle to recover braking energy according to the calibrated braking feedback parameters under the preset reference working condition.
In some embodiments, the electric vehicle braking energy recovery method further comprises:
calibrating the corresponding relation between the working condition and the brake feedback parameter; and/or
And calibrating the brake feedback parameters under the preset reference working condition.
In some embodiments, on the basis of determining the reasonable brake feedback parameter of the vehicle under the current load condition according to the load condition, the method further comprises the following steps:
and determining reasonable brake feedback parameters under the current load working condition by combining the running speed, the gradient and the battery state parameters of the vehicle and the preset limit brake feedback parameters in the motor controller.
In some embodiments, the electric vehicle braking energy recovery method further comprises:
the braking energy recovery is stopped in the case where the antilock apparatus of the vehicle is activated.
Based on the technical scheme, the braking energy recovery device of the electric vehicle disclosed by the embodiment of the disclosure subdivides braking energy feedback and load working conditions, determines a more matched braking feedback parameter according to the current actual load working condition, can recycle the braking energy according to the actual working condition, enables the determination of the braking energy feedback to be more precise, can be suitable for the requirements of different load working conditions, increases the recovery effect of the braking energy, and can optimize the braking experience of a driver; in addition, because some electric automobiles are not provided with the brake pedal analog quantity sensor, the mode can replace a brake pedal analog quantity signal to reflect the requirement of a driver on the braking effect obtained by feedback braking to a certain extent, the fit between the actuating feedback effect and the load working condition when the brake pedal analog quantity signal does not exist can be increased, and the method is safer and more reliable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:
fig. 1 is a schematic view of an operating principle of some embodiments of the braking energy recovery device of the electric vehicle according to the present disclosure.
FIG. 2 is a schematic diagram illustrating an operation principle of another embodiment of the braking energy recovery device of the electric vehicle according to the present disclosure;
FIG. 3 is a schematic flow chart diagram illustrating some embodiments of a method for recovering braking energy from an electric vehicle according to the present disclosure;
FIG. 4 is a schematic flow chart of another embodiment of the braking energy recovery method for the electric vehicle according to the disclosure.
Detailed Description
The present disclosure is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.
The terms "first", "second", and the like in the present disclosure are merely for convenience of description to distinguish different constituent elements having the same name, and do not denote a sequential or primary-secondary relationship.
In the description of the present disclosure, the directions or positional relationships indicated by "up", "down", "left", "right", "front", "rear", "inner", and "outer" and the like are all defined based on the direction in which the operator sits in the cab, and are merely for convenience of description of the present disclosure, and do not indicate or imply that the device referred to must have a specific direction, be configured and operated in a specific direction, and therefore, should not be construed as limiting the scope of the present disclosure.
The inventor notices that the same braking energy feedback parameters are adopted no matter what working condition the electric automobile is under in the related technology, and the adaptability is poor. For example, when braking is performed under a heavy load condition, recoverable braking energy is more, so that braking energy feedback parameters are smaller, energy waste can be caused, when a driver steps on a brake pedal, in order to keep energy recovery capability and avoid being influenced by the braking effect of an air path or an oil path, insufficient braking can be caused by too low feedback parameters, the braking requirement is not met, traffic accidents easily occur, the driver can step on the brake pedal deeply to meet the braking effect, kinetic energy and vehicle speed of the vehicle can be reduced rapidly due to too strong braking of the air path or the oil path, kinetic energy which can be used for recovery is lost, or an energy feedback program is closed due to the fact that the driver steps on the brake pedal deeply to judge that the brake is emergency braking; or when the vehicle is braked under the condition of light load, the recoverable braking energy is less, but the set braking energy feedback parameter is larger, so that the discomfort is caused when the driver steps on the brake pedal because the feedback braking is too violent, and the vehicle is decelerated too fast.
In consideration of the problems existing in the conventional energy brake recovery of the electric automobile, the inventor thinks that the brake feedback parameters are determined according to the actual working condition of the electric automobile, so that the determination of the brake feedback parameters is closer to the actual condition, the recovery utilization rate of energy can be improved, the comfort during brake operation can be ensured, and the driving requirement is met.
Generally, the stepping depth of a brake pedal can reflect the recoverable braking energy, if an angle analog sensor is arranged on the brake pedal in a vehicle, the recoverable braking energy can be conveniently determined according to the detection value of the sensor, but the sensor is not arranged on a certain part of electric automobiles because the arrangement of the brake pedal analog sensor needs to be subjected to many certifications. In view of this situation, the inventor has noticed that the load of the electric vehicle has an important influence on the braking energy feedback.
Based on this idea, the present disclosure provides an electric vehicle braking energy recovery device, which in some embodiments, as shown in fig. 1 and 2, includes: a multi-gear switch 1 and a vehicle control unit 3.
The multi-gear switch 1 has at least two gears and is configured to select different load working conditions of the vehicle by receiving external operation, the at least two gears correspond to different load working condition grades one by one, and the load intervals corresponding to different load working conditions are different. For example, the multi-gear switch 1 may be disposed on an instrument desk of an electric vehicle, and a driver may select a suitable gear by operating the multi-gear switch 1 according to a current load condition of the vehicle when energy recovery of the vehicle is required. For example, the multi-position switch 1 may select a rocker switch, a rotary switch, or the like.
The vehicle control unit 3 is electrically connected with the multi-gear switch 1, and is configured to match the load working condition selected by the multi-gear switch 1 with a preset working condition-brake feedback parameter corresponding relation to obtain a brake feedback parameter of the vehicle under the current load working condition, and enable the vehicle to recover brake energy according to the determined brake feedback parameter. The corresponding relation between the working condition and the brake feedback parameter can be calibrated in advance through tests under different load working conditions, and the corresponding relation can be a function curve or a mapping table and the like. The brake feedback parameters include, but are not limited to, the negative torque provided by the vehicle controller to the motor controller (or some matching coefficient in the software related to the magnitude of the negative torque) and the power, voltage, current, torque, and rotational speed related parameters generated by the brake feedback, such as the components of the motor, the battery, the motor controller, the high-voltage lines and plug-ins, the high-voltage fuse and contactor, which can bear the feedback current.
When the motor controller is used for controlling the motor to perform feedback braking, the torque of feedback current is controlled, so that the negative torque does not exceed the bearing capacity of a transmission system, the feedback or braking requirements can be met, and the braking feedback voltage and current generated during the negative torque are within the current power bearing capacity of high-voltage loops and components such as the motor controller, the motor, a high-voltage power battery, a finished automobile high-voltage circuit, a finished automobile high-voltage connector, a finished automobile high-voltage contactor and a high-voltage fuse. The Vehicle controller 3 can control the whole Vehicle, and is a central control unit of the whole Vehicle of the electric Vehicle, which is called VCU for short, and is called "Vehicle control unit" for all.
According to the embodiment, the braking energy feedback and the load working conditions are subdivided, and the more matched braking feedback parameters are determined according to the current actual load working conditions, so that the braking energy can be recycled according to the actual working conditions, the determination of the braking energy feedback is more precise, the method can be suitable for the requirements of different load working conditions, and the recovery effect of the braking energy is improved; moreover, the braking energy recovery is closely related to the braking experience of the driver, so that the braking effect and safety can be improved, and the braking experience of the driver is optimized; in addition, because some brake pedals of the cab of the electric automobile are not provided with analog quantity sensors, the mode can replace a brake pedal analog quantity signal to reflect the requirement of a driver on the braking effect obtained by regenerative braking to a certain extent, and the braking energy generated during braking is larger under the condition of larger vehicle load, so that the fitness of the actuating regenerative effect and the load working condition can be improved without the brake pedal analog quantity signal, and the electric automobile is safer and more reliable.
In some embodiments, the different load conditions include a first load condition, a second load condition, and a third load condition, the first load condition corresponding to a first load interval, the second load condition corresponding to a second load interval, and the third load condition corresponding to a third load interval. Wherein the minimum value of the first load interval is smaller than the minimum value of the second load interval, and the maximum value of the first load interval is smaller than the maximum value of the second load interval; the minimum value of the second load interval is smaller than the minimum value of the third load interval, and the maximum value of the second load interval is smaller than the maximum value of the third load interval.
According to the parameters of the field test calibration load interval, adjacent intervals are possible to be just adjacent; or a certain range of boundary contact ratio exists between the adjacent sections, so that the corresponding load working conditions of the adjacent sections can be considered after the corresponding load working conditions are selected, and the adaptability is improved.
For example, the whole load condition of the electric vehicle can be divided by a first load condition, a second load condition and a third load condition, wherein the first load condition represents light load, the second load condition represents medium load, and the third load condition represents heavy load.
According to the embodiment, the electric automobile can be divided into three levels according to the load, more matched brake feedback parameters can be determined according to different load levels, the recovery effect of brake energy is improved, and the brake experience of a driver is optimized.
Optionally, the braking energy feedback parameter can be divided into two loading conditions or more than three loading conditions according to actual requirements, so that the determination of the braking energy feedback parameter is matched and attached to the actual conditions.
In some embodiments, as shown in fig. 1, the braking energy recovery device of the electric vehicle further includes a message converter 2, and the multi-gear switch 1 is electrically connected to the vehicle control unit 3 through the message converter 2. The message converter 2 may be, for example, a signal conversion box. Specifically, the multi-gear switch 1 includes at least two switch contacts K, the at least two switch contacts K correspond to the at least two gears one to one, respective first ends of the at least two switch contacts K are connected to the high level, respective second ends of the at least two switch contacts K are connected to the plurality of input interfaces of the message converter 2, and two output signal ports of the message converter 2 are connected to the whole deviceThe two signal input interfaces of the vehicle controller 3 are connected, and the message converter 2 is provided with a power port V and a grounding port VDD. Optionally, the respective first ends of the at least two switch contacts K are connected to a low-level or passive signal node, which is specifically determined by a hardware design manner of the vehicle controller or the signal conversion box.
In the embodiment, by arranging the message converter 2, the message converter 2 can transmit the selected gear signal to the vehicle control unit 3 by using a preset communication protocol under the condition that an input signal port of the vehicle control unit 3 is not sufficient or the number of gears of the multi-gear switch 1 is large, so that the brake energy recovery device has strong adaptability to different vehicles, and the original hardware circuit design state of the vehicle control unit 3 does not need to be changed.
In other embodiments, as shown in fig. 2, the switch contacts corresponding to at least two gears of the multi-gear switch 1 are directly connected with at least two signal input interfaces of the vehicle controller 3 in a one-to-one correspondence through hard wires. When one of the switch contacts K of the multi-gear switch 1 is turned on, a high-level signal is transmitted to a corresponding signal input port of the vehicle control unit 3. Optionally, when one of the switch contacts K in the multi-stage switch 1 is turned on, a low-level signal or a passive signal node may also be transmitted to a corresponding signal input port of the vehicle controller 3, which is specifically determined according to a hardware design manner of the vehicle controller or the signal conversion box.
The embodiment is suitable for being used under the condition that the signal input port of the vehicle control unit 3 is abundant, and the connection mode of the multi-gear switch 1 and the vehicle control unit 3 can be simplified.
In some embodiments, the vehicle control unit 3 is configured to enable the vehicle to perform braking energy recovery according to the calibrated braking feedback parameters under the preset reference condition if the multi-gear switch 1 signal is not successfully received. The preset reference working condition is a brake feedback parameter calibrated without considering different load working conditions, and a designer can perform test calibration according to requirements and then give a corresponding appropriate parameter.
According to the embodiment of the disclosure, because electronic devices such as the multi-gear switch 1 and the message converter 2 are added, connecting wires are also added, and the parts have the possibility of failure or invalidation, when the electronic devices or the connecting wires have failures and the vehicle control unit 3 fails to receive the selection signal of the multi-gear switch 1, the brake feedback parameters can be determined according to the condition that the multi-gear switch 1 is not set to select the load working condition, light load, half load and heavy load are not distinguished, so that the smooth operation of the energy recovery function can be ensured under any condition, although the optimal brake energy recovery effect can not be ensured under each working condition, the recovery function can be realized at least when the controller 3 fails to receive the multi-gear switch 1 signal. From this, vehicle control unit 3 will receive the operating mode information of four kinds of vehicles, include: and (3) heavy load, half load and light load or not distinguishing heavy load, half load and light load modes.
In some embodiments, the electric vehicle braking energy recovery device further comprises a Motor Controller (MCU) configured to control the driving motor to operate in a generator mode to generate electric energy from kinetic energy of the vehicle in regenerative braking for generating electricity to charge the power battery; the vehicle control unit 3 is configured to determine a brake feedback parameter under the current load condition by combining a running speed, a gradient, a battery state parameter of the vehicle and a preset limit brake feedback parameter in the motor controller based on the current load condition. The maximum allowable brake feedback current can reflect the maximum allowable brake feedback torque (namely, the negative torque) applied to the motor.
In this embodiment, when the corresponding relationship between the operating condition and the brake feedback parameter is calibrated, the brake feedback parameter of the actual vehicle needs to be calibrated through tests in combination with the running speed, the gradient and the battery state parameter of the vehicle and the limit brake feedback parameter that can be borne by the motor controller, the motor and the transmission system under the specific load operating condition.
According to the embodiment, on the basis of dividing the brake feedback parameters through the vehicle load working conditions, other working conditions influencing the brake feedback parameters are further comprehensively considered, so that the determination mode of the brake feedback parameters is more specifically divided, the brake feedback parameters are determined through comprehensive consideration of multiple factors, the brake feedback parameters can be matched and attached with the actual working conditions, the recovery effect of brake energy is improved, and the brake experience of a driver is further optimized.
In some embodiments, the vehicle control unit 3 is configured to stop the braking energy recovery in the case where an antilock device (various types of related braking antilock system such as ABS or EBS) of the vehicle is activated. When the vehicle has abnormal working conditions of sudden braking, serious unevenness of the ground, sideslip of a vehicle body, skidding of wheels, locking of the wheels, serious mismatching of wheel speeds and the like, the safety of vehicle running is preferentially ensured, the recovery of braking energy is temporarily stopped, and the interference of the recovery of the braking energy on the normal work of an anti-lock braking system of the vehicle is prevented.
Secondly, this disclosure still provides an electric automobile, including the electric automobile braking energy recovery unit of above-mentioned embodiment.
The electric automobile of the embodiment can recycle the braking energy according to the actual working condition, so that the determination of the braking energy feedback amount is more precise, the electric automobile can be suitable for the requirements of different load working conditions, the recovery effect of the braking energy is improved, and the braking experience of a driver can be optimized; in addition, because many electric automobile's brake pedal does not have analog quantity sensor, this kind of mode can replace brake pedal analog quantity signal to a certain extent to reflect the braking energy that can supply to retrieve, can increase actuation feedback effect and the laminating nature of load operating mode when not having brake pedal analog quantity signal, and is safe and reliable more.
Finally, the present disclosure also provides a method for recovering braking energy of an electric vehicle, as shown in fig. 3, in some embodiments, the method includes:
101, receiving external operation through a multi-gear switch 1 to select different load working conditions of a vehicle, wherein the multi-gear switch 1 is provided with at least two gears, the at least two gears correspond to different load working condition grades one by one, and load intervals corresponding to different load working conditions are different; and
102, matching the load working condition selected by the vehicle controller 3 according to the multi-gear switch 1 with a preset corresponding relation between the working condition and a brake feedback parameter to determine a reasonable brake feedback parameter of the vehicle under the current load working condition;
and 103, enabling the vehicle to recover the braking energy according to the determined braking feedback parameters.
Wherein, the steps 101-103 are executed sequentially. The braking energy recovery method of the embodiment can recycle the braking energy according to the actual working condition, so that the determination of the braking energy feedback amount is more precise, the braking energy recovery method can be suitable for the requirements of different load working conditions, the recovery effect of the braking energy is improved, and the braking experience of a driver can be optimized; in addition, because the electric automobile is not provided with the brake pedal analog quantity sensor generally, the mode can replace a brake pedal analog quantity signal to reflect recoverable brake energy to a certain extent, the fit between the actuation feedback effect and the load working condition when no brake pedal analog quantity signal exists can be increased, and the electric automobile is safer and more reliable.
In some embodiments, the different load conditions include a first load condition, a second load condition, and a third load condition, the first load condition corresponding to a first load interval, the second load condition corresponding to a second load interval, and the third load condition corresponding to a third load interval. Wherein the minimum value of the first load interval is smaller than the minimum value of the second load interval, and the maximum value of the first load interval is smaller than the maximum value of the second load interval; the minimum value of the second load interval is smaller than the minimum value of the third load interval, and the maximum value of the second load interval is smaller than the maximum value of the third load interval. According to the embodiment, the electric automobile can be divided into three levels according to the load, more matched brake feedback parameters can be determined according to different load levels, the recovery effect of brake energy is improved, and the brake experience of a driver is optimized.
In some embodiments, as shown in fig. 4, the method for recovering braking energy of an electric vehicle further includes:
104, judging whether the vehicle controller 3 successfully receives the multi-gear switch 1 signal, if not, executing a step 105, and if so, executing a step 102;
and 105, recovering the braking energy of the vehicle according to the braking feedback parameters calibrated under the preset reference working condition.
According to the embodiment, when the vehicle control unit 3 fails to receive the selection signal of the multi-gear switch 1 due to the fact that the electronic devices such as the multi-gear switch 1 and the message converter 2 or the connecting wires are in failure, the brake feedback parameters can be determined according to the condition that the multi-gear switch 1 is not set to select the load working condition, and light load, half load and heavy load are not distinguished, so that smooth energy recovery can be guaranteed under any condition.
In some embodiments, the electric vehicle braking energy recovery method further comprises:
calibrating the corresponding relation between the working condition and the brake feedback parameter; and/or
And calibrating the brake feedback parameters under the preset reference working condition.
The result of the embodiment after the test calibration is performed can be stored in the vehicle control unit 3, so that the brake feedback parameter can be quickly obtained through the table look-up or function mapping relationship after the load working condition is selected through the multi-gear switch 1.
In some embodiments, on the basis of determining a reasonable braking feedback parameter of the vehicle under the current load condition according to the load condition, the braking energy recovery method for the electric vehicle further includes:
and determining reasonable brake feedback parameters under the current load working condition by combining the running speed, the gradient and the battery state parameters of the vehicle and the preset limit brake feedback parameters in the motor controller.
In this embodiment, when the corresponding relationship between the operating condition and the brake feedback parameter is calibrated, the brake feedback parameter of the actual vehicle needs to be calibrated through tests in combination with the running speed, the gradient and the battery state parameter of the vehicle and the limit brake feedback parameter that can be borne by the motor controller, the motor and the transmission system under the specific load operating condition.
According to the embodiment, on the basis of dividing the brake feedback parameters through the vehicle load working conditions, other working conditions influencing the brake feedback parameters are further comprehensively considered, so that the determination mode of the brake feedback parameters is more specifically divided, the brake feedback parameters are determined through comprehensive consideration of multiple factors, the brake feedback parameters can be matched and attached with the actual working conditions, the recovery effect of brake energy is improved, and the brake experience of a driver is further optimized.
In some embodiments, the electric vehicle braking energy recovery method further comprises:
the energy recovery is stopped when an anti-lock brake system (various related brake anti-lock systems such as ABS or EBS) of the vehicle is activated.
When the vehicle has abnormal working conditions of sudden braking, serious unevenness of the ground, sideslip of a vehicle body, skidding of wheels, locking of the wheels, serious mismatching of wheel speeds and the like, the safety of vehicle running is preferentially ensured, the recovery of braking energy is temporarily stopped, and the interference of the recovery of the braking energy on the normal work of an anti-lock braking system of the vehicle is prevented.
The embodiments provided by the present disclosure are described in detail above. The principles and embodiments of the present disclosure are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present disclosure. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present disclosure without departing from the principle of the present disclosure, and such improvements and modifications also fall within the scope of the claims of the present disclosure.
Claims (13)
1. A braking energy recovery device of an electric automobile is characterized in that,
the multi-gear switch (1) is provided with at least two gears and is configured to select different load working conditions of the vehicle by receiving external operation, the at least two gears correspond to different load working condition grades one by one, and load intervals corresponding to different load working conditions are different; and
and the vehicle control unit (3) is electrically connected with the multi-gear switch (1) and is configured to match the load working condition selected by the multi-gear switch (1) with a preset working condition-brake feedback parameter corresponding relation so as to obtain a brake feedback parameter of the vehicle under the current load working condition, and the vehicle is enabled to carry out brake energy recovery according to the determined brake feedback parameter.
2. The electric vehicle braking energy recovery device of claim 1, wherein the different load conditions include a first load condition, a second load condition, and a third load condition, the first load condition corresponding to a first load interval, the second load condition corresponding to a second load interval;
wherein the minimum value of the first load interval is smaller than the minimum value of the second load interval, and the maximum value of the first load interval is smaller than the maximum value of the second load interval; the minimum value of the second load interval is smaller than the minimum value of the third load interval, and the maximum value of the second load interval is smaller than the maximum value of the third load interval.
3. The electric vehicle braking energy recovery device according to claim 1, further comprising a message converter (2), wherein the multi-gear switch (1) is connected with the vehicle control unit (3) through the message converter (2); or
The switch contacts corresponding to the at least two gears of the multi-gear switch (1) are directly connected with the at least two signal input interfaces of the vehicle control unit (3) in a one-to-one correspondence manner through hard wires.
4. The braking energy recovery device of an electric vehicle according to claim 1, wherein the vehicle control unit (3) is configured to enable the vehicle to perform braking energy recovery according to the braking feedback parameters calibrated under the preset reference condition if the multi-gear switch (1) signal is not successfully received.
5. The electric vehicle braking energy recovery device of claim 1, further comprising a motor controller configured to control the driving motor to operate in a generator mode to generate electric energy from kinetic energy of the vehicle in a regenerative automatic manner for powering the power battery;
the vehicle control unit (3) is configured to determine reasonable brake feedback parameters under the current load working condition by combining the running speed, the gradient and the battery state parameters of the vehicle and the preset limit brake feedback parameters in the motor controller on the basis of the current load working condition.
6. The electric vehicle braking energy recovery device according to claim 1, wherein the vehicle control unit (3) is configured to stop braking energy recovery in case of a start of an anti-lock braking device of the vehicle.
7. An electric vehicle, characterized by comprising the braking energy recovery device of the electric vehicle as claimed in any one of claims 1 to 6.
8. A method for recovering braking energy of an electric automobile is characterized by comprising the following steps:
the method comprises the following steps that different load working conditions of a vehicle are selected by receiving external operation through a multi-gear switch (1), wherein the multi-gear switch (1) is provided with at least two gears, the at least two gears correspond to different load working condition grades one by one, and load intervals corresponding to different load working conditions are different; and
matching the load working condition selected by the multi-gear switch (1) with a preset corresponding relation between the working condition and the brake feedback parameter through the vehicle controller (3) to determine a reasonable brake feedback parameter of the vehicle under the current load working condition;
and the vehicle recovers the braking energy according to the determined braking feedback parameters.
9. The electric vehicle braking energy recovery method of claim 8, wherein the different load conditions include a first load condition, a second load condition, and a third load condition, the first load condition corresponding to a first load interval, the second load condition corresponding to a second load interval, and the third load condition corresponding to a third load interval;
wherein the minimum value of the first load interval is smaller than the minimum value of the second load interval, and the maximum value of the first load interval is smaller than the maximum value of the second load interval; the minimum value of the second load interval is smaller than the minimum value of the third load interval, and the maximum value of the second load interval is smaller than the maximum value of the third load interval.
10. The electric vehicle braking energy recovery method of claim 8, further comprising:
and judging whether the vehicle control unit (3) successfully receives the multi-gear switch (1) signal, and if not, enabling the vehicle to carry out braking energy recovery according to the calibrated braking feedback parameters under the preset reference working condition.
11. The electric vehicle braking energy recovery method of claim 10, further comprising:
calibrating the corresponding relation between the working condition and the brake feedback parameter; and/or
And calibrating the brake feedback parameters under the preset reference working condition.
12. The electric vehicle braking energy recovery method of claim 8, further comprising, on the basis of determining a reasonable braking feedback parameter of the vehicle under the current load condition according to the load condition:
and determining reasonable brake feedback parameters under the current load working condition by combining the running speed, the gradient and the battery state parameters of the vehicle and the preset limit brake feedback parameters in the motor controller.
13. The electric vehicle braking energy recovery method of claim 8, further comprising:
the braking energy recovery is stopped in the case where the antilock apparatus of the vehicle is activated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011230129.3A CN112193076A (en) | 2020-11-06 | 2020-11-06 | Electric automobile braking energy recovery device and method and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011230129.3A CN112193076A (en) | 2020-11-06 | 2020-11-06 | Electric automobile braking energy recovery device and method and electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112193076A true CN112193076A (en) | 2021-01-08 |
Family
ID=74034104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011230129.3A Pending CN112193076A (en) | 2020-11-06 | 2020-11-06 | Electric automobile braking energy recovery device and method and electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112193076A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114228499A (en) * | 2021-12-09 | 2022-03-25 | 华人运通(上海)云计算科技有限公司 | Electric automobile control method |
| CN115489323A (en) * | 2022-11-17 | 2022-12-20 | 潍柴动力股份有限公司 | Braking energy recovery method and device and vehicle |
-
2020
- 2020-11-06 CN CN202011230129.3A patent/CN112193076A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114228499A (en) * | 2021-12-09 | 2022-03-25 | 华人运通(上海)云计算科技有限公司 | Electric automobile control method |
| CN115489323A (en) * | 2022-11-17 | 2022-12-20 | 潍柴动力股份有限公司 | Braking energy recovery method and device and vehicle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103231658B (en) | Electrobus brake system and control method thereof | |
| CN110877529A (en) | Pure electric vehicle and energy recovery control method and control system thereof | |
| CN107662500A (en) | Pure electric automobile electrification control method and pure electric automobile | |
| CN102050029B (en) | Method and device for recycling energy of pure electric automobile | |
| CN107323270B (en) | Electric automobile and energy feedback method and system thereof | |
| CN102700419B (en) | Parallel-type braking energy recovery system and control method thereof | |
| CN102390331A (en) | Entire vehicle controller integrated with battery management system for pure electric automobile | |
| JP2001169405A (en) | Brake for vehicle | |
| CN109849933B (en) | Method and device for determining driver demand torque, vehicle and readable storage medium | |
| CN108430823A (en) | Regenerative brake control device for electro-motive vehicle | |
| KR20090023629A (en) | Redundant hardware architecture for the control signal stage of the braking system of a vehicle in which all the wheels are connected to at least one rotary electrical machine | |
| CN106671790A (en) | Controller, method and system for vehicle braking energy feedback and automobile | |
| CN104716703A (en) | Battery discharge device with self-adjusting resistance | |
| CN101973269B (en) | Control system for mine electric wheel dump truck by using fieldbus technology | |
| CN105437983A (en) | Vehicle system and method for adapting lift pedal regeneration | |
| CN112193076A (en) | Electric automobile braking energy recovery device and method and electric automobile | |
| CN115384319A (en) | Pure electric vehicle safety control method and system | |
| CN108082007B (en) | Vehicle operation condition switching method and device and automobile | |
| KR101541711B1 (en) | Vehicle and braking control method thereof | |
| CN213920684U (en) | Electric automobile braking energy recovery device and electric automobile | |
| CN112319206B (en) | Hybrid power system, control method thereof and vehicle | |
| CN116946093A (en) | Braking control method and system | |
| CN203902318U (en) | Vehicle control unit of electric vehicle | |
| CN105523025A (en) | Control system for at least one electric motor, usable as a generator, of a vehicle; and braking system for a vehicle | |
| JP2000085568A (en) | Parking brake machine for automobile and its operating method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |