Coasting energy recovery system and coasting energy recovery method

Abstract

The present application relates to a coasting energy recovery system (10), comprising: a target energy recovery calculation unit (1), the target energy recovery calculation unit (1) calculating the coasting power that currently needs to be recovered based on the expected deceleration; a recovery capacity calculation unit (2), the recovery capacity calculation unit (2) calculating the coasting power that can currently be recovered in consideration of the current recovery capacity of the vehicle; a comparison unit (3), the comparison unit (3) comparing the coasting power that needs to be recovered with the coasting power that can be recovered and outputting a comparison result; and a decision unit (4), the decision unit (4) acquiring the comparison result and triggering the vehicle's braking system to perform braking when the coasting power that needs to be recovered is greater than the coasting power that can be recovered.

Description

Technical Field

[0001] The present application relates to the recovery of vehicle coasting energy, and in particular, to a vehicle coasting energy recovery system and a coasting energy recovery method. Background Art

[0002] Currently, in the electric vehicle sector, energy recovery technology is often used to recapture energy during coasting or braking to achieve more efficient energy utilization. Because the amount of energy that can be recovered depends not only on the vehicle's mechanical energy but also on the SOC of the vehicle's drive battery, the characteristics of the motor itself, and other factors, existing technologies typically only recapture a small amount of mechanical energy during coasting to ensure a safe coasting distance and a pleasant driving experience (slowly decelerating during coasting). This approach can prevent significant changes in the driver's driving experience during the coasting phase due to certain motor characteristics or the battery's charge storage state. Summary of the Invention

[0003] The purpose of this application is to solve or alleviate the problems existing in the prior art to a certain extent.

[0004] According to a first aspect of the present application, a coasting energy recovery system is provided, comprising:

[0005] a target energy recovery calculation unit, wherein the target energy recovery calculation unit calculates the current coasting power that needs to be recovered based on the expected deceleration;

[0006] a recovery capability calculation unit configured to calculate the current recoverable coasting power while taking into account the current recovery capability of the vehicle;

[0007] a comparing unit, the comparing unit comparing the glide power that needs to be recovered with the glide power that can be recovered, and outputting a comparison result; and

[0008] A decision unit is configured to obtain the comparison result and trigger a braking system of the vehicle to perform braking when the coasting power that needs to be recovered is greater than the coasting power that can be recovered.

[0009] According to a second aspect of the present application, a coasting energy recovery method is proposed, comprising:

[0010] Obtaining the current coasting power that needs to be recovered based on the expected deceleration;

[0011] Calculate the current coasting power that can be recovered while taking into account the vehicle's current recovery capability;

[0012] comparing the glide power that needs to be recovered with the glide power that can be recovered; and

[0013] A trigger instruction is output when the coasting power that needs to be recovered is greater than the coasting power that can be recovered.

[0014] According to a third aspect of the present application, a computer device is proposed, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the gliding energy recovery method as described in any embodiment of the present application when executing the program.

[0015] According to a fourth aspect of the present application, a computer-readable storage medium is proposed, on which a computer program is stored, characterized in that the program is executed by a processor to implement the steps of the coasting energy recovery method as described in any embodiment of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The disclosure of the present invention will become more easily understood with reference to the accompanying drawings. It will be readily understood by those skilled in the art that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0017] Figure 1 schematically illustrates a coasting energy recovery system disclosed in the present application; and

[0018] Figure 2 The coasting energy recovery method disclosed in this application is schematically shown. DETAILED DESCRIPTION

[0019] First refer to the attached Figure 1 , which exemplarily shows a module diagram of the coasting energy recovery system disclosed in this application. It should be noted that the modules in the module diagram in this application are only for illustrating the different functional modules of the system, and do not represent that it is constructed as different hardware in the hardware field. In other words, multiple modules may constitute a hardware in the actual hardware system, or a module may be composed of multiple hardware in the actual hardware system. Specifically, Figure 1The coasting energy recovery system includes a target energy recovery calculation unit 1, a recovery capacity calculation unit 2, a comparison unit 3, and a decision unit 4. When the vehicle enters a coasting state, the target energy recovery calculation unit 1 calculates the coasting power that the vehicle currently needs to recover based on the vehicle's expected deceleration. The recovery capacity calculation unit 2 calculates the coasting power that the vehicle can currently recover based on the vehicle's current state or coasting energy recovery capacity. The comparison unit 3 compares the coasting power that needs to be recovered and the coasting power that can be recovered, respectively, calculated by the target energy recovery calculation unit 1 and the recovery capacity calculation unit 2, and generates a comparison result. Within the scope of the present application, the comparison unit 3 may directly output the comparison result to the decision unit 4, or may selectively output the comparison result to the decision unit 4, for example, only when the coasting power that needs to be recovered is greater than the coasting power that can be recovered. Upon obtaining the comparison result, the decision unit 4 triggers the vehicle's braking system to apply braking if the coasting power that needs to be recovered is greater than the coasting power that can be recovered. Through the coasting energy recovery system 10 disclosed in the present application, the vehicle can, unlike traditional coasting energy recovery methods, fully recover coasting energy as much as possible when the vehicle's recovery capacity allows, and use the braking system to supplement insufficient deceleration when the vehicle's recovery capacity is insufficient. This not only improves the vehicle's coasting energy recovery rate, but also ensures that the driver feels a stable vehicle deceleration during coasting (avoiding the situation where the vehicle's actual deceleration is reduced due to insufficient coasting energy recovery).

[0020] Within the scope of the present application, the recuperation capacity calculation unit 2 must consider the recuperation capacity of the vehicle's relevant components or mechanisms, including the drive motor's speed, the power battery's state of charge (SOC), and the power battery's temperature, when calculating the vehicle's current actual recyclable coasting power. As is well known to those skilled in the art, the drive motor's external characteristics determine its speed, which in turn affects its output torque. Consequently, different motor speeds result in different output torques (and therefore different recoverable coasting torques). Furthermore, since the vehicle's coasting energy is recovered into the power battery, the power battery's state of charge determines whether it can currently receive the required coasting energy. Furthermore, when recovering coasting energy, the power battery's current temperature must also be considered to prevent charging when the battery temperature is too high, which could adversely affect its service life or safety. Optionally, the drive motor's current operating temperature can also be considered when calculating the vehicle's current actual recyclable coasting power, thereby ensuring safe operation and maintaining the drive motor's service life. Optionally, the vehicle's current recuperation capacity also takes into account any faults in the drive motor and / or power battery. This ensures that in the event of a failure of the drive motor and / or the power battery, the decision unit 4 can make a corresponding decision to ensure that the vehicle can coast to a stop safely.

[0021] In some embodiments of the present application, when the coasting power to be recovered is greater than the recoverable coasting power, decision unit 4 triggers the vehicle's braking system to output braking torque to compensate for the shortfall in the recoverable coasting power relative to the required coasting power, thereby ensuring that the vehicle achieves its desired deceleration. Because this situation often requires the braking system to quickly build brake pressure, the braking system can be configured to utilize its electric braking component to compensate for the shortfall in deceleration when decision unit 4 triggers the braking system. Furthermore, compared to traditional hydraulic braking, electric braking also offers advantages in terms of vehicle NVH. Therefore, using electric braking to compensate for deceleration can further improve the driver's driving experience during the coasting phase.

[0022] In some embodiments of the present application, the aforementioned expected deceleration can be set to a predetermined deceleration of the vehicle during coasting conditions. In other words, the expected deceleration is a fixed value and is a configuration of the vehicle itself. Within the scope of the present application, due to the use of a coasting energy recovery system, the expected deceleration is greater than that of conventional coasting energy recovery. In other words, the greater expected deceleration referred to in the present application represents the potential for greater coasting energy recovery.

[0023] The present application also relates to a coasting energy recovery method, comprising the following steps:

[0024] Obtaining the current coasting power that needs to be recovered based on the expected deceleration (S1);

[0025] Calculating the current coasting power that can be recovered by taking into account the current recovery capability of the vehicle (S2);

[0026] comparing the coasting power that needs to be recovered with the coasting power that can be recovered (S3); and

[0027] When the coasting power that needs to be recovered is greater than the coasting power that can be recovered, a trigger instruction is output ( S4 ).

[0028] In some embodiments of the present application, the step (S2) of calculating the recyclable coasting power considers the following factors: the current speed of the vehicle's drive motor, the state of charge of the power battery, and the temperature of the power battery. Specifically, as described above, the current speed of the drive motor, the state of charge of the power battery, and the temperature of the power battery affect the actual amount of coasting energy that the vehicle can currently recycle.

[0029] In some embodiments of the present application, when the coasting power required to be recovered is greater than the coasting power that can be recovered, the trigger command is output to supplement the shortfall between the coasting power that can be recovered and the coasting power required to be recovered. For example, a trigger command can be output to the vehicle's braking system, causing the braking system to output braking torque to supplement the shortfall between the coasting power that can be recovered and the coasting power required to be recovered, thereby ensuring that the vehicle achieves its desired deceleration. Of course, this application also includes implementations in which trigger commands are output to actuators in other vehicles to supplement deceleration.

[0030] In some embodiments of the present application, the desired deceleration is set to a predetermined deceleration for the vehicle during coasting. In other words, the desired deceleration is a fixed value and is configured by the vehicle itself. Within the scope of the present application, the desired deceleration can be greater than the desired deceleration for conventional coasting regenerative braking.

Claims

1. A coasting energy recovery system (10), comprising: A target energy recovery calculation unit (1), wherein the target energy recovery calculation unit (1) calculates the current coasting power that needs to be recovered based on the expected deceleration; A recovery capability calculation unit (2), wherein the recovery capability calculation unit (2) calculates the current recoverable coasting power while taking into account the current recovery capability of the vehicle; A comparison unit (3), wherein the comparison unit (3) compares the glide power that needs to be recovered with the glide power that can be recovered, and outputs a comparison result; as well as A decision unit (4) is configured to obtain the comparison result and trigger a braking system of the vehicle to perform braking when the coasting power to be recovered is greater than the coasting power that can be recovered. The expected deceleration is set as a predetermined deceleration of the vehicle under coasting conditions.

2. The coasting energy recovery system (10) according to claim 1, characterized in that The current recovery capability of the vehicle is determined by taking into account the following factors: the current rotation speed of the vehicle's drive motor, the charge state of the power battery, and the temperature of the power battery.

3. The coasting energy recovery system (10) according to claim 2, characterized in that The current temperature of the drive motor is also taken into consideration for the current recovery capability of the vehicle.

4. The coasting energy recovery system (10) according to claim 1, characterized in that The decision unit (4) triggers the vehicle's braking system to supplement the shortfall of the recoverable coasting power relative to the recoverable coasting power when the coasting power required to be recovered is greater than the recoverable coasting power.

5. The coasting energy recovery system (10) according to claim 4, characterized in that The vehicle's braking system uses an electric braking mechanism to supplement the missing portion.

6. The coasting energy recovery system (10) according to claim 2, characterized in that The current recovery capability of the vehicle is also considered in terms of failure of the drive motor and / or the power battery.

7. A coasting energy recovery method, characterized in that: include: Obtaining a current coasting power that needs to be recovered based on an expected deceleration (S1), wherein the expected deceleration is set to a predetermined deceleration of the vehicle under a coasting condition; Calculating the current coasting power that can be recovered by taking into account the current recovery capability of the vehicle (S2); comparing the glide power that needs to be recovered with the glide power that can be recovered (S3); and When the coasting power that needs to be recovered is greater than the coasting power that can be recovered, a trigger instruction is output (S4).

8. The coasting energy recovery method according to claim 7, characterized in that: In the step ( S2 ) of calculating the recoverable coasting power, the following factors are considered, including: the current rotation speed of the vehicle's drive motor, the charge state of the power battery, and the temperature of the power battery.

9. The coasting energy recovery method according to claim 7, characterized in that: When the coasting power required to be recovered is greater than the recoverable coasting power, the trigger instruction is output to supplement the shortfall of the recoverable coasting power relative to the required coasting power.

10. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the coasting energy recovery method according to any one of claims 7 to 9 are implemented.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the steps of the coasting energy recovery method according to any one of claims 7 to 9.

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