CN112895907A - Energy recovery control system and method for vehicle - Google Patents
Energy recovery control system and method for vehicle Download PDFInfo
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- CN112895907A CN112895907A CN202110220667.2A CN202110220667A CN112895907A CN 112895907 A CN112895907 A CN 112895907A CN 202110220667 A CN202110220667 A CN 202110220667A CN 112895907 A CN112895907 A CN 112895907A
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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
- B60L7/18—Controlling the braking effect
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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
- 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
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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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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The present disclosure provides an energy recovery control system of a vehicle, the control system including: a distance sensor configured to monitor a distance to a forward target; a vehicle speed sensor configured to monitor a vehicle speed; a battery management system configured to monitor a remaining capacity of a battery; an energy recovery system configured to perform energy recovery in an on state to charge the battery; a controller in real-time communication with the distance sensor, the speed sensor, and the battery management system, configured to: controlling the energy recovery system to be in an open state in response to detecting that the distance is less than or equal to a preset distance threshold; estimating the remaining duration of the energy recovery system which is continuously in the opening state at present based on the distance and the vehicle speed; and controlling the current of the energy recovery system for charging the battery based on the residual electric quantity and the residual time length. The embodiment of the disclosure can improve the recovery rate of vehicle energy recovery.
Description
Technical Field
The disclosure relates to the field of new energy automobiles, in particular to an energy recovery control system and method of a vehicle.
Background
With the rapid development of the new energy automobile industry, the energy recovery system is arranged in the automobile to save energy consumption, so that the energy recovery system has important application significance. In the prior art, the vehicle only uses the driver's active braking alone as the only way to turn on the energy recovery system. This results in energy recovery that is too dependent on the actuation and duration of the brake pedal, and low recovery rates.
Disclosure of Invention
An object of the present disclosure is to provide an energy recovery control system and method for a vehicle, which can improve the recovery rate of vehicle energy recovery.
According to an aspect of an embodiment of the present disclosure, there is disclosed an energy recovery control system of a vehicle, the control system including:
a distance sensor configured to monitor a distance between the vehicle and a forward target object;
a vehicle speed sensor configured to monitor a vehicle speed of the vehicle;
a battery management system configured to monitor a remaining capacity of a battery of a vehicle;
an energy recovery system configured to perform energy recovery in an on state to charge the battery;
a controller in real-time communication with the distance sensor, the speed sensor, and the battery management system, configured to:
controlling the energy recovery system to be in an open state in response to detecting that the distance is less than or equal to a preset distance threshold;
estimating the remaining duration of the energy recovery system which is continuously in the opening state at present based on the distance and the vehicle speed;
and controlling the current of the energy recovery system for charging the battery based on the residual electric quantity and the residual time length.
In an exemplary embodiment of the present disclosure, the pedal sensor includes:
a brake pedal sensor configured to monitor a first stroke of a brake pedal of a vehicle;
an accelerator pedal sensor configured to monitor a second stroke of an accelerator pedal of the vehicle;
the controller is configured to:
predicting the remaining duration based on the distance, the vehicle speed and the first stroke;
or estimating the remaining time length based on the distance, the vehicle speed and the second stroke.
In an exemplary embodiment of the present disclosure, the controller is configured to:
and when the first stroke is greater than 0 and the second stroke is greater than or equal to 0, estimating the remaining time length based on the distance, the vehicle speed and the first stroke.
In an exemplary embodiment of the present disclosure, the controller is configured to:
determining a first acceleration of the vehicle based on the first trip;
and estimating the remaining duration based on the distance, the vehicle speed and the first acceleration.
In an exemplary embodiment of the present disclosure, the controller is configured to:
determining a second acceleration of the vehicle based on the second trip;
and estimating the remaining time length based on the distance, the vehicle speed and the second acceleration.
In an exemplary embodiment of the present disclosure, the controller is further configured to: controlling the energy recovery system to be in an on state in response to detecting that the first stroke is greater than 0.
In an exemplary embodiment of the present disclosure, the controller is configured to:
estimating a first current which should be output by the energy recovery system in the process that the energy recovery system increases the residual electric quantity to a preset target electric quantity by the residual time;
determining a second current which can be received by the battery at the highest under the current residual capacity;
and controlling the energy recovery system to charge the battery by taking a low current as an upper current limit, wherein the low current is the lowest current of the first current and the second current.
In an exemplary embodiment of the present disclosure, the controller is configured to:
subtracting the residual electric quantity from the target electric quantity to obtain a difference electric quantity;
and dividing the difference electric quantity by the remaining time length to obtain the first current.
In an exemplary embodiment of the present disclosure, the control system further includes: a target speed sensor in real-time communication with the controller configured to monitor a speed of movement of the forward target;
the controller is configured to:
monitoring the relative speed between the vehicle and the front target object based on the vehicle speed and the moving speed;
and estimating the residual time length based on the distance and the relative speed.
According to an aspect of an embodiment of the present disclosure, there is disclosed an energy recovery control method of a vehicle, the method including:
monitoring the distance between the vehicle and a front target object, the vehicle speed of the vehicle and the residual electric quantity of the battery;
in response to detecting that the distance is smaller than or equal to a preset distance threshold, controlling the energy recovery system to be in an on state, wherein the energy recovery system performs energy recovery in the on state to charge a battery of the vehicle;
estimating the remaining duration of the energy recovery system which is continuously in the opening state at present based on the distance and the vehicle speed;
and controlling the current of the energy recovery system for charging the battery based on the residual electric quantity and the residual time length.
In the embodiment of the disclosure, the energy recovery system is started when the vehicle and the front target object are controlled to approach to a certain distance through monitoring of the distance, so that the energy recovery is avoided depending on the braking judgment of a driver. Under the condition that a driver does not brake the vehicle, energy recovery can be carried out in advance, so that the recovery rate of the energy recovery of the vehicle is improved; and the current fed back to the battery is controlled by combining the vehicle speed and the residual electric quantity, so that the reasonability of battery charging in the energy recovery process can be ensured.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a flowchart of an energy recovery control method of a vehicle according to one embodiment of the present disclosure.
FIG. 2 shows a basic structural schematic of a vehicle according to one embodiment of the present disclosure.
FIG. 3 shows a line drawing for energy recovery by the energy recovery system according to one embodiment of the present disclosure.
FIG. 4 shows a flow diagram of energy recovery control according to one embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more example embodiments. In the following description, numerous specific details are provided to give a thorough understanding of example embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, steps, and so forth. In other instances, well-known structures, methods, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The present disclosure provides an energy recovery control system for a vehicle, which is mainly used for controlling the start of the energy recovery system in the vehicle and the current level fed back to a battery after the start. Generally, a battery of a vehicle is a power battery pack formed by a plurality of power batteries.
Specifically, the control system provided by the present disclosure mainly includes: the vehicle-mounted controller comprises a distance sensor, a vehicle speed sensor, a battery management system, an energy recovery system and a controller.
The distance sensor is used for monitoring the distance between the vehicle and a front target object. The front object may be a moving object (e.g., a traveling vehicle or a pedestrian) or a stationary object (e.g., a stationary vehicle or a stationary brake). The distance sensor is typically a radar provided on the vehicle. It will be appreciated that for safety reasons, the driver must generally brake the vehicle before it contacts the forward object.
The vehicle speed sensor is used for monitoring the vehicle speed of the vehicle. The vehicle speed sensor may be a wheel speed sensor provided on the vehicle, or may be a radar provided on the vehicle.
The battery management system is used for monitoring the residual capacity of the battery. It should be noted that, in addition to monitoring the remaining power of the battery, the battery management system may also be used to monitor battery states of the battery, such as voltage, charge/discharge current, cell temperature, and cell voltage.
The energy recovery system is used for energy recovery in an on state to charge a battery of a vehicle. Generally, energy recovery performed by an energy recovery system mainly converts thermal energy generated by a vehicle in a braking process into mechanical energy and then into electric energy, and feeds back the electric energy to a battery, thereby achieving an energy recovery effect.
The controller is used as a core scheduling component of the control system, is communicated with each sensor or subsystem in real time, monitors the distance between the controller and a front target object, the vehicle speed and the residual electric quantity of the battery through each sensor or subsystem in real time, and controls the energy recovery system to be started and the current fed back to the battery after the energy recovery system is started based on the monitored data.
Fig. 1 illustrates an energy recovery control method of a vehicle provided by the present disclosure. Referring to fig. 1, a control process of the controller for the energy recovery system in the embodiment of the present disclosure is described.
In the embodiment of the disclosure, the controller monitors the distance S between the vehicle and the front target object through the distance sensor. In response to detecting that the spacing S is equal to or less than the preset distance threshold S0(S0 is generally set as a safe spacing during vehicle travel), the controller controls the energy recovery system to be in an on state.
In the embodiment of the disclosure, once the controller detects that the distance S is less than or equal to S0, the controller may turn on the energy recovery system even if the braking signal is not detected (i.e., even if the driver does not brake the vehicle), so that the energy recovery system operates in advance to recover energy.
In the embodiment of the disclosure, in the process of energy recovery when the energy recovery system is in the on state, the controller may also estimate the remaining duration T of the energy recovery system continuing to be in the on state in real time based on the distance S and the vehicle speed V monitored by the vehicle speed sensor. It can be understood that, in the limit condition of the non-avoidance, the vehicle will stop completely at the moment of meeting with the front target object, and when the vehicle stops completely, no energy can be recovered by the energy recovery system, so the upper limit of the remaining time length T is the time length taken for the vehicle to meet with the front target object from the current time.
Therefore, the controller further controls the current fed back to the battery when the energy recovery system charges the battery in real time based on the remaining time length T and the remaining power soc (state of charge) of the battery monitored by the battery management system, so as to ensure reasonable charging of the battery in real time.
Therefore, in the embodiment of the disclosure, the energy recovery system is started when the vehicle is controlled to approach to the front target object to a certain distance through monitoring of the distance, so that the energy recovery is prevented from being dependent on braking judgment of a driver. Under the condition that a driver does not brake the vehicle, energy recovery can be carried out in advance, so that the recovery rate of the energy recovery of the vehicle is improved; and the current fed back to the battery is controlled by combining the vehicle speed and the residual electric quantity, so that the reasonability of battery charging in the energy recovery process can be ensured.
In one embodiment, the controller is configured to: and dividing the distance by the vehicle speed to obtain the remaining time length.
In this embodiment, when the energy recovery system is in the on state, the controller divides the monitored distance S between the vehicle and the front target object by the vehicle speed V, and estimates the remaining duration T of the current energy recovery system continuing to be in the on state.
It should be noted that the embodiment is only an exemplary illustration, and should not limit the function and the scope of the disclosure.
In one embodiment, the controller is configured to: and subtracting a preset minimum safe distance from the distance, and dividing the distance by the vehicle speed to obtain the remaining duration.
In this embodiment, the predetermined minimum safe distance S1 is generally less than the distance S between the moving vehicle and the forward object. When the energy recovery system is in an open state, the controller subtracts S1 from the monitored distance S between the vehicle and the front target object, then divides the S by the vehicle speed V, and estimates the remaining duration T of the current energy recovery system in the open state in real time.
It should be noted that the embodiment is only an exemplary illustration, and should not limit the function and the scope of the disclosure.
In one embodiment, the control system further includes a target speed sensor in real-time communication with the controller. The object speed sensor is used for monitoring the moving speed of the front object, so that the controller can monitor the moving speed of the front object through the object speed sensor.
Further, when the energy recovery system is in an on state, the controller monitors a relative speed between the vehicle and the front object based on the monitored vehicle speed of the vehicle and the movement speed of the front object; and further estimating the remaining duration of the current energy recovery system in the continuously opened state in real time based on the monitored distance between the vehicle and the front target object and the relative speed.
The embodiment has the advantages that the estimation accuracy of the residual time length is improved by further combining the moving speed of the front target object to estimate the residual time length, so that the reasonability of the subsequent current feedback is improved.
It should be noted that the embodiment is only an exemplary illustration, and should not limit the function and the scope of the disclosure.
In one embodiment, the control system further includes a pedal sensor in real-time communication with the controller. The pedal sensor is used for monitoring the stroke of the pedal of the vehicle, so that the controller can monitor the stroke of the pedal of the vehicle through the pedal sensor. As can be appreciated, the pedal of the vehicle is mainly used for the driver to perform acceleration control or deceleration control on the vehicle; the longer the pedal stroke, the faster the acceleration or deceleration; the shorter the pedal stroke, the slower the acceleration or deceleration.
Furthermore, when the energy recovery system is in the open state, the controller estimates the remaining duration of the energy recovery system in the open state in real time based on the monitored distance from the front target object, the vehicle speed and the pedal stroke.
Wherein the pedal sensor includes a brake pedal sensor and an accelerator pedal sensor that are in real-time communication with the controller, respectively. The brake pedal sensor is used for monitoring a first stroke of a brake pedal of the vehicle, so that the controller monitors the first stroke of the brake pedal through the brake pedal sensor; the accelerator pedal sensor is used for monitoring a second stroke of an accelerator pedal of the vehicle, so that the controller monitors the second stroke of the accelerator pedal through the accelerator pedal sensor.
It will be appreciated that in most cases, the brake pedal and the accelerator pedal will not be actuated simultaneously. Therefore, when the brake pedal acts, the controller estimates the remaining time length T of the current energy recovery system in the opening state in real time based on the monitored distance S between the vehicle and the front target object, the vehicle speed V of the vehicle and the first stroke L1 of the brake pedal; when the accelerator pedal acts, the controller estimates the remaining time T of the current energy recovery system in an opening state in real time based on the monitored distance S, the vehicle speed V and the second stroke L2 of the accelerator pedal.
In one embodiment, the action of the brake pedal is given a high priority, and the action of the accelerator pedal is given a low priority. That is, the brake pedal may act simultaneously with the accelerator pedal; and when the brake pedal and the accelerator pedal act simultaneously (i.e., the first stroke L1 of the brake pedal is greater than 0, and the second stroke L2 of the accelerator pedal is also greater than 0), the controller estimates the remaining time period T based on the spacing S, the vehicle speed V, and the first stroke L1 of the brake pedal.
Obviously, when only the brake pedal is actuated (i.e., the first stroke L1 of the brake pedal is greater than 0 and the second stroke L2 of the accelerator pedal is equal to 0), the controller also estimates the remaining time period T based on the spacing S, the vehicle speed V, and the first stroke L1 of the brake pedal.
In this embodiment, the controller estimates the remaining time period T based on the spacing S, the vehicle speed V, and the first stroke L2 of the accelerator pedal only when the brake pedal is not actuated (i.e., when the first stroke L1 of the brake pedal is equal to 0).
The embodiment has the advantages that the energy recovery system is controlled in a mode of priority of the braking signals, and the strong control right of the braking signals on the energy recovery is ensured.
In one embodiment, the controller determines a first acceleration a1 of the vehicle based on the monitored first stroke L1 of the brake pedal. The magnitude of the first acceleration a1 is positively correlated with the length of the first stroke L1. Furthermore, the controller may apply a kinematic theorem to process the monitored space S, the vehicle speed V and the first acceleration a1, and estimate the remaining duration T of the current energy recovery system continuously in the on state in real time.
In one embodiment, the controller determines a second acceleration a2 of the vehicle based on the monitored second travel L2 of the accelerator pedal. The magnitude of the second acceleration a2 is positively correlated with the length of the second stroke L2. Furthermore, the controller may apply a kinematic theorem to process the monitored space S, the vehicle speed V and the second acceleration a2, and estimate the remaining duration T of the current energy recovery system continuously in the on state in real time. Wherein the direction of the first acceleration a1 is opposite to the direction of the second acceleration a 2.
In an embodiment, the controller is further configured to: and controlling the energy recovery system to be in an open state in response to detecting that the first stroke is greater than 0.
In this embodiment, the controller controls the energy recovery system to be in the on state when the controller detects that the distance S between the vehicle and the front object is less than or equal to the distance threshold value S0, and also controls the energy recovery system to be in the on state when the controller detects the brake pedal action (i.e., the first stroke L1 of the brake pedal is greater than 0).
The embodiment has the advantages that the energy recovery can be carried out in response to the braking signal, and also can be carried out in advance when no braking signal exists, so that the recovery rate of the energy recovery is improved while the basic user requirements of the energy recovery are ensured.
In an embodiment, after the controller estimates the remaining time period T during which the current energy recovery system is continuously in the on state, the controller further estimates a first current I1 to be output to the battery if the energy recovery system is to just increase the remaining power soc to the preset target power Q0 within the remaining time period T in combination with the monitored remaining power soc of the battery. The target electric quantity Q0 may be an electric quantity of 100% of the battery capacity or an electric quantity of less than 100% of the battery capacity according to the application demand.
The controller also determines the second current I2 that the battery can receive the highest current at the present remaining charge soc.
Furthermore, if I1 is smaller than I2, the controller controls the current energy recovery system to charge the battery with I1 as the upper current limit, that is, the current when the current energy recovery system charges the battery cannot exceed I1; if I1 is larger than I2, the controller controls the current energy recovery system to charge the battery with I2 as the upper current limit, namely, the current when the current energy recovery system is controlled to charge the battery cannot exceed I2; if I2 equals I2, the controller controls the current energy recovery system to charge the battery with either I1 or I2 as the upper current limit.
In one embodiment, the controller subtracts residual electric quantity soc from target electric quantity Q0 to obtain difference electric quantity Q1; the difference electric quantity Q1 is divided by the remaining time period T to estimate a first current I1.
It should be noted that the embodiment is only an exemplary illustration, and should not limit the function and the scope of the disclosure. According to a specific management strategy for the battery, the process of obtaining the first current through the difference electric quantity and the remaining time length can be adjusted accordingly, for example: and dividing the difference electric quantity into different sections, and adjusting functions or function parameters adopted by different sections for obtaining the first current according to the physical characteristics of the battery.
Fig. 2 shows a basic structural diagram of a vehicle according to an embodiment of the present disclosure.
Referring to fig. 2, in this embodiment, the components related to energy recovery in the vehicle are mainly: MCU (Microcontroller Unit), VCU (Vehicle Control Unit), CRBS (cooperative Energy Recovery System), BMS (Battery management System), power Battery, millimeter-wave radar, brake pedal, and accelerator pedal.
The millimeter wave radar is mainly used for monitoring the distance between a vehicle and a front target object and the speed of the vehicle.
BMS are mainly used to manage the batteries of vehicles, for example: charge management and discharge management.
The CRBS is mainly used to convert thermal energy generated when the vehicle is decelerated or braked into mechanical energy, and then into electrical energy, and feed back the electrical energy to the power battery through the BMS. The CRBS is turned on and the magnitude of the feedback current is mainly controlled by the VCU.
Fig. 3 shows a line drawing of energy recovery by the energy recovery system according to an embodiment of the present disclosure.
Referring to fig. 3, in this embodiment, the abscissa of fig. 3 is a time axis, and the ordinate is a current value. The area enclosed by the abscissa and the ordinate, shown by the lines in the figure, represents the recovered energy.
The process of the current value from-90 to-20 indicates that the vehicle is in a sliding or decelerating state, and the intensity of energy recovery is gradually reduced; the abrupt change occurring around the time axis 2.0 is caused by the difference in the intensity of energy recovery; the process that the current value is continuously increased from-20 indicates that the vehicle is in a remarkable deceleration state, and the intensity of energy recovery is gradually increased.
FIG. 4 shows a flow chart of energy recovery control of an embodiment of the present disclosure.
Referring to fig. 4, in this embodiment, the energy recovery is controlled by the vehicle control unit VCU.
During the running process of the vehicle, the millimeter wave radar on the vehicle monitors the distance between the vehicle and a front target object. And when the distance is less than or equal to the preset safety distance 150M, the VCU controls the energy recovery system to be started in advance, and energy recovery is carried out in advance. When the distance is larger than 150M, the VCU controls the energy recovery system to be started after detecting the braking signal, and the duration of the braking signal is used as the energy recovery duration.
After the energy recovery system is started in advance, if the brake pedal does not act (namely the brake pedal stroke L1 is equal to 0), the VCU estimates the remaining time T of the current energy recovery by combining the accelerator pedal stroke L2, the distance S between the vehicle and the front target object and the current vehicle speed V; if the brake pedal is actuated (i.e., the brake pedal travel L2 is greater than 0 and not equal to 0), VCU estimates the remaining time period T in conjunction with the spacing S and the vehicle speed V.
The remaining power soc of the power battery is divided into sub-intervals in advance, and the soc of each sub-interval corresponds to a maximum receivable current I2, so that a current matrix describing the corresponding relation between the soc sub-interval and I2 is obtained.
After the energy recovery system is started, the VCU reads the residual electric quantity soc of the current power battery through the battery management system EMS, and estimates the current I1 which is output to the battery if the residual electric quantity soc is just improved to the preset target electric quantity within the residual time T by combining the estimated residual time T. And comparing the I1 with the current matrix so as to determine the current fed back to the power battery when the current energy is recovered.
It should be noted that the embodiments shown in fig. 2, fig. 3 and fig. 4 are only exemplary illustrations, and should not limit the function and the scope of the disclosure.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (10)
1. An energy recovery control system of a vehicle, characterized by comprising:
a distance sensor configured to monitor a distance between the vehicle and a forward target object;
a vehicle speed sensor configured to monitor a vehicle speed of the vehicle;
a battery management system configured to monitor a remaining capacity of a battery of a vehicle;
an energy recovery system configured to perform energy recovery in an on state to charge the battery;
a controller in real-time communication with the distance sensor, the speed sensor, and the battery management system, configured to:
controlling the energy recovery system to be in an open state in response to detecting that the distance is less than or equal to a preset distance threshold;
estimating the remaining duration of the energy recovery system which is continuously in the opening state at present based on the distance and the vehicle speed;
and controlling the current of the energy recovery system for charging the battery based on the residual electric quantity and the residual time length.
2. The control system of claim 1, further comprising:
a brake pedal sensor configured to monitor a first stroke of a brake pedal of a vehicle;
an accelerator pedal sensor configured to monitor a second stroke of an accelerator pedal of the vehicle;
the controller is configured to:
predicting the remaining duration based on the distance, the vehicle speed and the first stroke;
or estimating the remaining time length based on the distance, the vehicle speed and the second stroke.
3. The control system of claim 2, wherein the controller is configured to:
and when the first stroke is greater than 0 and the second stroke is greater than or equal to 0, estimating the remaining time length based on the distance, the vehicle speed and the first stroke.
4. The control system of claim 2, wherein the controller is configured to:
determining a first acceleration of the vehicle based on the first trip;
and estimating the remaining duration based on the distance, the vehicle speed and the first acceleration.
5. The control system of claim 2, wherein the controller is configured to:
determining a second acceleration of the vehicle based on the second trip;
and estimating the remaining time length based on the distance, the vehicle speed and the second acceleration.
6. The control system of claim 2, wherein the controller is further configured to: controlling the energy recovery system to be in an on state in response to detecting that the first stroke is greater than 0.
7. The control system of claim 1, wherein the controller is configured to:
estimating a first current which should be output by the energy recovery system in the process that the energy recovery system increases the residual electric quantity to a preset target electric quantity by the residual time;
determining a second current which can be received by the battery at the highest under the current residual capacity;
and controlling the energy recovery system to charge the battery by taking a low current as an upper current limit, wherein the low current is the lowest current of the first current and the second current.
8. The control system of claim 7, wherein the controller is configured to:
subtracting the residual electric quantity from the target electric quantity to obtain a difference electric quantity;
and dividing the difference electric quantity by the remaining time length to obtain the first current.
9. The control system of claim 1, further comprising: a target speed sensor in real-time communication with the controller configured to monitor a speed of movement of the forward target;
the controller is configured to:
monitoring the relative speed between the vehicle and the front target object based on the vehicle speed and the moving speed;
and estimating the residual time length based on the distance and the relative speed.
10. An energy recovery control method of a vehicle, characterized by comprising:
monitoring the distance between the vehicle and a front target object, the vehicle speed of the vehicle and the residual electric quantity of the battery;
in response to detecting that the distance is smaller than or equal to a preset distance threshold, controlling the energy recovery system to be in an on state, wherein the energy recovery system performs energy recovery in the on state to charge a battery of the vehicle;
estimating the remaining duration of the energy recovery system which is continuously in the opening state at present based on the distance and the vehicle speed;
and controlling the current of the energy recovery system for charging the battery based on the residual electric quantity and the residual time length.
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