Adaptive parking control method for new energy commercial vehicles based on EPB

Abstract

The present invention discloses an adaptive parking control method for new energy commercial vehicles based on EPB, comprising: an EPB controller calculating a required parking brake force; when the brake pedal is not fully depressed, the EPB controller selecting one of the required parking brake force and the maximum parking brake force as the parking brake force for parking based on the relationship between the required parking brake force and the maximum parking brake force; when the brake pedal is fully depressed, the EPB controller selecting one of the required parking brake force, the fully loaded ramp parking force, and the maximum parking brake force as the parking brake force for parking based on the relationship between the required braking force, the fully loaded ramp parking force, and the maximum parking brake force. The adaptive parking control method for new energy commercial vehicles based on EPB of the present invention obtains the parking brake force based on the real-time driving braking force, is completely unrelated to the vehicle's empty or full-load state and the road slope conditions at the time, and adaptively matches the different parking torques required by commercial vehicles of different tonnages.

Description

Technical Field

[0001] The present invention relates to the field of automobile electronic parking technology, and in particular to an adaptive parking control method for a new energy commercial vehicle based on EPB. Background Art

[0002] With the rapid development of electrification and intelligent vehicles, EPB (Electronic Hydraulic Braking System) has become a standard feature in passenger cars. With the younger generation of commercial vehicle drivers and the rapid development of commercial vehicles, EPB is also becoming increasingly popular among commercial vehicle drivers. A key function of EPB is hill start assist. When the EPB controller detects that the driving force is greater than the parking force, EPB releases the parking brake, allowing the vehicle to start, eliminating the safety hazard of rolling after starting.

[0003] Because the front and rear axle loads of passenger cars vary little between unloaded and fully loaded, calibrating the hill start function based on the fully loaded state can meet the need for smooth starting on slopes from unloaded to fully loaded. For commercial vehicles, the front and rear axle loads vary significantly between unloaded and fully loaded. When unloaded, the front axle load is heavier than the rear axle load, while when fully loaded, the rear axle load is heavier than the front axle load. When calibrating the EPB hill start function, to eliminate the risk of slipping after starting, the vehicle is generally calibrated based on the fully loaded state. Different slopes are selected from small to large, such as 0%, 10%, and 20%, and the required parking torque and starting torque at these slopes are calibrated. When the starting torque reaches the set parking torque, EPB releases the parking torque. Interpolation is used for other slopes to achieve the perfect function from the smallest to the largest slope. This method uses the fully loaded vehicle state as the calibration object, resulting in a smaller starting torque required when the vehicle is unloaded than when it is fully loaded at the same slope. However, due to the limited EPB calibration function, the starting release torque of the entire vehicle is much greater than the required torque, causing the unloaded vehicle to jerk when starting, affecting driving safety to a certain extent, and at the same time wasting the output torque of the motor to a certain extent.

[0004] Therefore, there is an urgent need for an adaptive parking control method for new energy commercial vehicles based on EPB. Summary of the Invention

[0005] The purpose of the present invention is to provide an adaptive parking control method for new energy commercial vehicles based on EPB to solve the above-mentioned problems in the prior art and avoid the forward rushing problem in the starting phase of conventional commercial vehicles with EPB.

[0006] The present invention provides an adaptive parking control method for a new energy commercial vehicle based on EPB, which includes:

[0007] The EPB controller calculates the required parking brake force;

[0008] When the brake pedal is not fully depressed, the EPB controller selects one of the required parking brake force and the maximum parking brake force as the parking brake force for parking according to the relationship between the required parking brake force and the maximum parking brake force;

[0009] When the brake pedal is fully depressed, the EPB controller selects one of the required parking brake force, the fully loaded hill parking force, and the maximum parking brake force as the parking brake force for parking according to the relationship among the required parking brake force, the fully loaded hill parking force, and the maximum parking brake force.

[0010] In the above-mentioned adaptive parking control method for new energy commercial vehicles based on EPB, preferably, the EPB controller calculates the required parking brake force, specifically including:

[0011] The EPB controller collects the master cylinder pressure signal;

[0012] The EPB controller calculates the required parking brake force according to the master cylinder pressure signal.

[0013] The adaptive parking control method for new energy commercial vehicles based on EPB as described above, wherein preferably, when the brake pedal is not fully depressed, the EPB controller selects one of the required parking braking force and the maximum parking braking force as the parking braking force for parking based on the relationship between the required parking braking force and the maximum parking braking force, specifically including:

[0014] If the required parking brake force is less than or equal to the maximum parking brake force, the EPB controller will park the vehicle according to the required parking brake force.

[0015] If the required parking brake force is greater than the maximum parking brake force, the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller.

[0016] As described above, in the EPB-based adaptive parking control method for new energy commercial vehicles, preferably, when the EPB controller parks the vehicle according to the required parking braking force, the vehicle can be parked and started smoothly.

[0017] As described above, in the EPB-based adaptive parking control method for new energy commercial vehicles, preferably, when the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller, the EPB controller sends an alarm signal to remind the driver.

[0018] The adaptive parking control method for new energy commercial vehicles based on EPB as described above, wherein preferably, when the brake pedal is fully depressed, the EPB controller selects one of the required parking braking force, the fully loaded ramp parking force, and the maximum parking braking force as the parking braking force for parking based on the relationship among the required parking braking force, the fully loaded ramp parking force, and the maximum parking braking force, specifically including:

[0019] If the required parking brake force is less than or equal to the fully loaded hill parking force, the EPB controller will park the vehicle according to the required parking force;

[0020] If the fully loaded ramp calibrated force ≤ required parking force < maximum parking force, the EPB controller will park the vehicle according to the fully loaded ramp parking force;

[0021] If the required parking brake force is greater than the maximum parking brake force, the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller.

[0022] As described above, in the EPB-based adaptive parking control method for new energy commercial vehicles, preferably, when the EPB controller parks according to the required parking force or the fully loaded slope parking force, the vehicle can park and start smoothly.

[0023] As described above, in the EPB-based adaptive parking control method for new energy commercial vehicles, preferably, when the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller, the EPB controller sends an alarm signal to remind the driver.

[0024] The present invention provides an adaptive parking control method for new energy commercial vehicles based on EPB. The method obtains the parking braking force based on the real-time driving braking force, which is completely unrelated to the empty or full-load state of the vehicle and the slope conditions of the road. The method can adaptively match the different parking torques required by commercial vehicles of different tonnages, thereby maximally ensuring the parking force required for the entire vehicle to park on a slope, and avoiding the jerking and sliding of the vehicle when starting on a slope due to the empty or full-load state of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0026] Figure 1 A flowchart of an embodiment of the EPB-based adaptive parking control method for new energy commercial vehicles provided by the present invention;

[0027] Figure 2 This is a logic diagram of an embodiment of the adaptive parking control method for new energy commercial vehicles based on EPB provided by the present invention when the brake pedal is not fully depressed;

[0028] Figure 3 This is a logic diagram of an embodiment of the adaptive parking control method for new energy commercial vehicles based on EPB provided by the present invention when the brake pedal is fully depressed. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure, its application, or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions, and numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0030] The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different parts. Terms such as "include" or "comprising" mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements. Terms such as "upper," "lower," and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0031] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intervening component between the specific component and the first component or the second component. When a specific component is described as being connected to another component, the specific component may be directly connected to the other component without an intervening component, or may not be directly connected to the other component but have an intervening component.

[0032] All terms (including technical or scientific terms) used in this disclosure have the same meaning as those understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, general dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined herein.

[0033] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0034] like Figure 1-Figure 3As shown, the adaptive parking control method for new energy commercial vehicles based on EPB provided in this embodiment includes the following steps during actual execution:

[0035] Step S1: The EPB controller calculates the required parking brake force.

[0036] In one embodiment of the adaptive parking control method for new energy commercial vehicles based on EPB of the present invention, step S1 may specifically include:

[0037] Step S11: The EPB controller collects a master cylinder pressure signal.

[0038] Step S12: The EPB controller calculates the required parking brake force according to the master cylinder pressure signal.

[0039] When the vehicle is parked on a slope, the EPB controller can collect the master cylinder pressure signal, calculate the driving braking force based on the pressure signal, and then convert it into the braking force required for parking, so as to perform slope parking.

[0040] Step S2: When the brake pedal is not fully depressed, the EPB controller selects one of the required parking braking force and the maximum parking braking force as the parking braking force for parking according to the relationship between the required parking braking force and the maximum parking braking force.

[0041] When the driver parks the vehicle on a slope with a certain inclination, the driver will normally step on the brakes, and after the vehicle stops, pull up to park. When parking the vehicle on a slope, based on driving habits, the driver will not press the brake pedal completely to the bottom, but can only step on it until the vehicle stops. In this driving state, the vehicle parked on the slope is parked according to one of the required parking brake force and the maximum parking brake force. When the EPB system is used for parking, the maximum parking force it can exert must be less than the maximum driving brake force of the vehicle. Based on this control strategy, EPB will encounter two states when converting the driving brake force, 1. The required parking brake force ≤ the maximum parking brake force; 2. The required parking brake force > the maximum parking brake force. See the judgment process. Figure 2 .

[0042] In one embodiment of the adaptive parking control method for new energy commercial vehicles based on EPB of the present invention, step S2 may specifically include:

[0043] Step S21: If the required parking brake force is less than or equal to the maximum parking brake force, the EPB controller parks the vehicle according to the required parking brake force.

[0044] When the EPB controller parks the vehicle according to the required parking brake force, the vehicle can be parked and started smoothly.

[0045] Step S22: If the required parking brake force is greater than the maximum parking brake force, the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller.

[0046] When the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller, the EPB controller sends an alarm signal to remind the driver.

[0047] Step S3: When the brake pedal is fully depressed, the EPB controller selects one of the required parking brake force, the fully loaded ramp parking force, and the maximum parking brake force as the parking brake force for parking according to the relationship among the required parking brake force, the fully loaded ramp parking force, and the maximum parking brake force.

[0048] At present, if the driver steps on the driving pedal deeply on a slope, and the driving force is far greater than the current parking force required to park on the slope, the EPB controller not only needs to work according to the maximum load, but also frequently reminds the driver, causing a certain panic. Based on this situation, the present invention, when controlling parking, not only judges the required parking force of the entire vehicle on the slope with the parking force converted by the driving braking force, but also compares it with the theoretical parking force of the fully loaded vehicle on the current slope. In order to ensure that a fully loaded vehicle can be effectively parked on a slope, the maximum parking force of the EPB must be greater than the fully loaded parking force of the vehicle on the slope. See the judgment process. Figure 3 .

[0049] In one embodiment of the adaptive parking control method for new energy commercial vehicles based on EPB of the present invention, step S3 may specifically include:

[0050] Step S31: If the required parking brake force is less than or equal to the fully loaded hill parking force, the EPB controller parks the vehicle according to the required parking force.

[0051] When the EPB controller parks the vehicle according to the required parking force, the vehicle can be parked and started smoothly.

[0052] Step S32: If the fully loaded ramp calibrated force ≤ the required parking force < the maximum parking force, the EPB controller parks the vehicle according to the fully loaded ramp parking force.

[0053] When the EPB controller parks the vehicle according to the fully loaded hill parking force, the vehicle can be parked and started smoothly.

[0054] Step S33: If the required parking brake force is greater than the maximum parking brake force, the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller.

[0055] When the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller, the EPB controller sends an alarm signal to remind the driver.

[0056] The EPB-based adaptive parking control method for new energy commercial vehicles provided in an embodiment of the present invention obtains the parking braking force based on the real-time driving braking force, and is completely unrelated to the vehicle's empty or full load status and the slope conditions of the road. It can adaptively match the different parking torques required by commercial vehicles of different tonnages, thereby maximally ensuring the parking force required for the entire vehicle on a slope, and avoiding the jerking and sliding when starting on a slope due to the empty or full load status of the vehicle.

[0057] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0058] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. An adaptive parking control method for new energy commercial vehicles based on EPB, characterized in that: include: The EPB controller calculates the required parking brake force; When the brake pedal is not fully depressed, the EPB controller selects one of the required parking brake force and the maximum parking brake force as the parking brake force for parking according to the relationship between the required parking brake force and the maximum parking brake force; When the brake pedal is fully depressed, the EPB controller selects one of the required parking brake force, the fully loaded hill parking force, and the maximum parking brake force as the parking brake force for parking the vehicle based on the relationship among the required parking brake force, the fully loaded hill parking force, and the maximum parking brake force. When the brake pedal is fully depressed, the EPB controller selects one of the required parking brake force, the fully loaded ramp parking force, and the maximum parking brake force as the parking brake force for parking the vehicle based on the relationship among the required parking brake force, the fully loaded ramp parking force, and the maximum parking brake force. Specifically, the method includes: If the required parking brake force is less than or equal to the fully loaded hill parking force, the EPB controller will park the vehicle according to the required parking force; If the fully loaded ramp calibrated force ≤ required parking force < maximum parking force, the EPB controller will park the vehicle according to the fully loaded ramp parking force; If the required parking brake force is greater than the maximum parking brake force, the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller.

2. The adaptive parking control method for new energy commercial vehicles based on EPB according to claim 1 is characterized in that: The EPB controller calculates the required parking brake force, specifically including: The EPB controller collects the master cylinder pressure signal; The EPB controller calculates the required parking brake force according to the master cylinder pressure signal.

3. The adaptive parking control method for new energy commercial vehicles based on EPB according to claim 1, characterized in that: When the brake pedal is not fully depressed, the EPB controller selects one of the required parking brake force and the maximum parking brake force as the parking brake force for parking according to the relationship between the required parking brake force and the maximum parking brake force, specifically including: If the required parking brake force is less than or equal to the maximum parking brake force, the EPB controller will park the vehicle according to the required parking brake force. If the required parking brake force is greater than the maximum parking brake force, the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller.

4. The adaptive parking control method for new energy commercial vehicles based on EPB according to claim 3 is characterized in that: When the EPB controller parks the vehicle according to the required parking brake force, the vehicle can be parked and started smoothly.

5. The adaptive parking control method for new energy commercial vehicles based on EPB according to claim 3 is characterized in that: When the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller, the EPB controller sends an alarm signal to remind the driver.

6. The adaptive parking control method for new energy commercial vehicles based on EPB according to claim 1, characterized in that: When the EPB controller parks the vehicle according to the required parking force or the fully loaded hill parking force, the vehicle can be parked and started smoothly.

7. The adaptive parking control method for new energy commercial vehicles based on EPB according to claim 1, characterized in that: When the EPB controller parks the vehicle according to the maximum parking brake force of the EPB controller, the EPB controller sends an alarm signal to remind the driver.

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