Steering energy-saving control method and system

Abstract

The invention discloses a steering energy-saving control method and system.The method comprises the steps that under the condition that an enabling condition is met, a steering energy-saving control step is executed, and the steering energy-saving control step comprises the steps that a first limiting coefficient is determined according to the vehicle speed, the steering angle of a steering wheel and the steering torque; determining the conversion weight of a load switch according to light, medium and heavy load switch signals of the cab; determining a load signal according to the real load of the vehicle and the load switch conversion weight; determining a second limiting coefficient according to the load signal; determining the heating degree according to the steering motor temperature, and determining a third limiting coefficient according to the heating degree; and the initial rotating speed of the electric steering pump is multiplied by the first limiting coefficient, the second limiting coefficient and the third limiting coefficient to obtain the output rotating speed of the electric steering pump. The driving state of the vehicle is judged through vehicle signals and subjective input information of a driver, and then the rotating speed of a steering pump is limited to achieve the purpose of reducing energy consumption of the whole vehicle.

Description

Technical Field

[0001] This application belongs to the technical field of power control of the three-electric systems of new energy vehicles, and relates to a steering energy-saving control method and system, specifically to a steering energy-saving control method and system applicable to new energy electric vehicles. Background Art

[0002] The current development and popularization of new energy electric vehicles have become a major trend, with the new energy penetration rate continuously increasing and users' attention to new energy vehicles also growing continuously. Range anxiety is a major pain point restricting the development of new energy electric vehicles. Limited by the bottleneck in battery technology, the current mainstream power lithium batteries are relatively heavy, have a long charging time, and their capacity and output power will be greatly reduced at low ambient temperatures; the energy consumption burden of the whole vehicle will increase during high-speed driving and in high-temperature weather (limited by the cooling requirements of vehicle components); and the operating efficiency of the motor and battery will be greatly reduced.

[0003] Therefore, how to improve the driving range of new energy electric vehicles is an important goal for major mainstream manufacturers at present. Summary of the Invention

[0004] Objective: In view of at least one of the above technical problems, this application provides a steering energy-saving control method and system to reduce steering energy consumption and thus extend the driving range.

[0005] Technical Solution: To solve the above technical problems, the technical solution adopted in this application is as follows: In the first aspect, a steering energy-saving control method is provided, including: When the enabling condition is met, execute the steering energy-saving control step, and the steering energy-saving control step includes: Determine the first limiting coefficient according to the vehicle speed, the steering wheel steering angle, and the steering torque; Determine the load switch conversion weight according to the light, medium, and heavy load switch signals in the cab; determine the load signal according to the actual load of the vehicle and the load switch conversion weight; determine the second limiting coefficient according to the load signal; Determine the degree of heat absorption according to the temperature of the steering motor, and determine the third limiting coefficient according to the degree of heat absorption; Multiply the initial speed of the electric power steering pump by the first limiting coefficient, the second limiting coefficient, and the third limiting coefficient to obtain the output speed of the electric power steering pump.

[0006] In some embodiments, determining the first limiting coefficient according to the vehicle speed, the steering wheel steering angle, and the steering torque includes: If the vehicle speed is in the low-speed stage, the first limiting coefficient is K11; If the vehicle speed is in the medium-speed stage, the first limiting coefficient is K12; If the vehicle speed is in the high-speed stage, and the steering wheel steering angle is greater than or equal to the set angle or the steering torque is greater than or equal to the set torque value, the first limiting coefficient is K11; If the vehicle speed is in the high-speed stage, the steering wheel steering angle is less than the set angle and the steering torque is less than the set torque value, the first limiting coefficient is K13; Where K11, K12, and K13 are the values of the first limiting coefficient, and 0 < K13 < K12 < K11 ≤ 1.

[0007] In some embodiments, determining the load switch conversion weight according to the light, medium, and heavy load switch signals of the cab includes: When the light, medium, and heavy load switch of the cab is in the light load state, the load switch conversion weight is the maximum load value × a; When the light, medium, and heavy load switch of the cab is in the medium load state, the load switch conversion weight is the maximum load value × b; When the light, medium, and heavy load switch of the cab is in the heavy load state, the load switch conversion weight is the maximum load value × c; Where a, b, and c are switch conversion coefficients, and 0 < a < b < c < 1.

[0008] In some embodiments, determining the load signal according to the actual vehicle load and the load switch conversion weight includes: Load signal = actual vehicle load × W1 + load switch conversion weight × W2; Where W1 and W2 are weight coefficients, and W1 + W2 = 1.

[0009] In some embodiments, determining the second limiting coefficient according to the load signal includes: If 0 ≤ load signal ≤ 30% of the maximum load, the load signal is in the light load state, and the second limiting coefficient is K21; If 30% of the maximum load < load signal ≤ 60% of the maximum load, the load signal is in the medium load state, and the second limiting coefficient is K22; If 60% of the maximum load < load signal, the load signal is in the heavy load state, and the second limiting coefficient is K23; Where K21, K22, and K23 are the values of the second limiting coefficient, and 0 < K23 < K22 < K21 ≤ 1.

[0010] In some embodiments, determining the degree of heat absorption according to the temperature T of the steering motor includes: Normal heat absorption: T ≤ T1; First-level heat absorption: T1 < T ≤ T2 or when decreasing from T2 < T ≤ T3 to T ≤ T1; Second-level heat absorption: T2 < T ≤ T3 or when decreasing from T3 < T ≤ T4 to T ≤ T2; Third-level heat absorption: T > T4.

[0011] In some embodiments, determining the third limiting coefficient according to the degree of heat absorption includes: If the degree of heat absorption is normal heat absorption, the third limiting coefficient is K31; If the degree of heat absorption is first-level heat absorption, the third limiting coefficient is K32; If the degree of heat absorption is second-level heat absorption, the third limiting coefficient is K33; If the degree of heat absorption is third-level heat absorption, the third limiting coefficient is K34; Where K31, K32, K33, and K34 are the values of the third limiting coefficient, and 0 ≤ K34 < K33 < K32 < K31 ≤ 1.

[0012] In some embodiments, the initial rotational speed of the electric power steering pump is 1500 rpm.

[0013] In some embodiments, the enabling conditions need to simultaneously satisfy (1) to (5): (1) The whole vehicle is in a normal high-voltage state; (2) The current gear is not in N gear; (3) The handbrake is released; (4) The steering motor has no third-level fault; (5) The steering motor is in an enabled state.

[0014] In a second aspect, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the method is implemented.

[0015] In a third aspect, a controller is provided, including a processor and a storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the method.

[0016] In a fourth aspect, a steering energy-saving control system is provided, including the controller described above.

[0017] In a fifth aspect, a new energy electric vehicle is provided, configured with the controller or the steering energy-saving control system described above.

[0018] Beneficial effects achieved by the present application compared with the prior art: In the present application, by monitoring vehicle speed, gear position, temperature of the steering pump of the electric power steering system (EPS), handbrake, light / medium / heavy load switch in the cab, actual vehicle load, steering wheel angle, and steering torque of the steering wheel, a light / medium / heavy load mapping signal of the vehicle is obtained by comprehensively considering the subjective load demand of the driver and the actual vehicle load, and a second limiting coefficient is calculated; combining the first limiting coefficient determined based on vehicle speed, steering torque of the steering wheel, and steering angle of the steering wheel and the third limiting coefficient determined based on the temperature of the steering motor; multiplying with the initial rotational speed of the electric steering pump to obtain the optimized output rotational speed of the electric steering pump, that is, the driving state of the vehicle is judged based on vehicle signals and the subjective input information of the driver, and then the rotational speed of the steering pump is limited to achieve the purpose of reducing the overall vehicle energy consumption. The rotational speed of the EPS steering pump is reasonably adjusted to avoid unnecessary energy consumption, thereby extending the cruising range. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic flow diagram of the steering energy-saving control method for the embodiments of the present application. Detailed Embodiments

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation on the present application and its application or use.

[0022] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indication will also change accordingly. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0023] In addition, terms such as "first", "second", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood through specific circumstances.

[0025] To solve the problems of empty hitting and insufficient striking force that occur when a new energy electric vehicle breaks, this application provides a steering energy-saving control method and system.

[0026] Embodiment 1: As Figure 1 shown, this application provides a steering energy-saving control method, including: When the enabling conditions are met, execute the steering energy-saving control steps, and the steering energy-saving control steps include: Determine a first limit coefficient according to the vehicle speed, the steering angle of the steering wheel, and the steering torque; Determine the load switch conversion weight according to the light, medium, and heavy load switch signals in the cab; determine the load signal according to the actual load of the vehicle and the load switch conversion weight; determine a second limit coefficient according to the load signal; Determine the degree of heat absorption according to the temperature of the steering motor, and determine a third limit coefficient according to the degree of heat absorption; Multiply the initial speed of the electric power steering pump by the first limit coefficient, the second limit coefficient, and the third limit coefficient to obtain the output speed of the electric power steering pump.

[0027] The following details the specific steps.

[0028] In some embodiments, the enabling conditions need to simultaneously meet (1) to (5): (1) The whole vehicle is in a normal state of being powered on; (2) The current gear is not in N gear; (3) The handbrake is released; (4) The steering motor has no level 3 faults; (5) The steering motor is in an enabled state.

[0029] It should be noted that only when the above enabling conditions are met can the following steering energy-saving control actions be triggered.

[0030] S1. Determine the first limiting coefficient according to the vehicle speed, the steering angle of the steering wheel, and the steering torque.

[0031] In some embodiments, S1 specifically includes: If the vehicle speed is in the low-speed stage, the first limiting coefficient is K11 (such as 100%); If the vehicle speed is in the medium-speed stage, the first limiting coefficient is K12 (such as 97%); If the vehicle speed is in the high-speed stage, and the steering angle of the steering wheel is greater than or equal to the set angle (such as 40 degrees) or the steering torque is greater than or equal to the set torque value (which can be set according to specific circumstances), the first limiting coefficient is K11 (such as 100%); If the vehicle speed is in the high-speed stage, the steering angle of the steering wheel is less than the set angle (such as 40 degrees) and the steering torque is less than the set torque value, the first limiting coefficient is K13 (such as 94%); Where K11, K12, and K13 are the values of the first limiting coefficient, and 0 < K13 < K12 < K11 ≤ 1.

[0032] In this embodiment, the vehicle speed is divided into 3 stages according to the vehicle speed limit range of commercial vehicles: Low-speed stage: 0 ≤ V ≤ 30 km / h; Medium-speed stage: 30 < V ≤ 60 km / h; High-speed stage: 60 < V ≤ 100 km / h.

[0033] S2. Determine the load switch conversion weight according to the light, medium, and heavy load switch signals of the cab; determine the load signal according to the actual vehicle load and the load switch conversion weight; determine the second limiting coefficient according to the load signal.

[0034] In this step, the actual vehicle load is obtained by real-time monitoring of the vehicle weight through the electric power steering system EBS, and the light, medium, and heavy load switch signals of the cab are collected. Taking the maximum load value as a reference, the load signal is designed by comprehensively considering the driver's subjective requirements (i.e., the load switch conversion weight) and the actual vehicle load.

[0035] In some embodiments, S2 specifically includes: S21. Obtain the actual vehicle load and the light, medium, and heavy load switch signals of the cab; S22. Determine the load switch conversion weight according to the light, medium, and heavy load switch signals of the cab, specifically including: When the light, medium, and heavy load switch of the cab is in the light load state, the load switch conversion weight is the maximum load value × a (such as 15%); When the light / medium / heavy load switch in the cab is set to medium load, the conversion weight of the load switch is the maximum load value × b (e.g., 45%); When the light / medium / heavy load switch in the cab is set to heavy load, the conversion weight of the load switch is the maximum load value × c (e.g., 80%); Where a, b, and c are switch conversion coefficients, and 0 < a < b < c < 1.

[0036] S23. Determine the load signal based on the actual vehicle load and the conversion weight of the load switch, specifically including: Load signal = actual vehicle load × W1 (e.g., 60%) + conversion weight of the load switch × W2 (e.g., 40%); where W1 and W2 are weight coefficients, and W1 + W2 = 1.

[0037] S24. Determine the second limit coefficient based on the load signal, specifically including: If 0 ≤ load signal ≤ 30% of the maximum load, the load signal is for light load, and the second limit coefficient is K21 (e.g., 100%); If 30% of the maximum load < load signal ≤ 60% of the maximum load, the load signal is for medium load, and the second limit coefficient is K22 (e.g., 97%); If 60% of the maximum load < load signal, the load signal is for heavy load, and the second limit coefficient is K23 (e.g., 94%); Where K21, K22, and K23 are the values of the second limit coefficient, and 0 < K23 < K22 < K21 ≤ 1.

[0038] S3. Determine the degree of heat absorption based on the temperature of the steering motor, and determine the third limit coefficient based on the degree of heat absorption. The degree of heat absorption includes normal heat absorption, first-level heat absorption, second-level heat absorption, and third-level heat absorption.

[0039] S31. Determine the degree of heat absorption based on the temperature T of the steering motor, including: Normal heat absorption: T ≤ T1; First-level heat absorption: T1 < T ≤ T2 or when it drops from T2 < T ≤ T3 to T ≤ T1; Second-level heat absorption: T2 < T ≤ T3 or when it drops from T3 < T ≤ T4 to T ≤ T2; Third-level heat absorption: T > T4. (In this embodiment, T1 is, for example, 110°C, T2 is, for example, 120°C, T3 is, for example, 130°C, and T4 is, for example, 140°C).

[0040] S32. Determine the third limit coefficient based on the degree of heat absorption, including: If the degree of heat absorption is normal heat absorption, the third limit coefficient is K31 (e.g., 100%); If the degree of heat absorption is first-level heat absorption, the third limit coefficient is K32 (e.g., 96%); If the heating degree is the second - level heating, the third limiting coefficient is K33 (such as 93%); If the heating degree is the third - level heating, the third limiting coefficient is K34 (such as 0%); Where K31, K32, K33, and K34 are the values of the third limiting coefficient, and 0 ≤ K34 < K33 < K32 < K31 ≤ 1.

[0041] S4. Multiply the initial speed of the electric power steering pump by the first limiting coefficient, the second limiting coefficient, and the third limiting coefficient to obtain the output speed of the electric power steering pump.

[0042] In this embodiment, the initial speed of the electric power steering pump is 1500 rpm.

[0043] Embodiment 2: The embodiment of the present application provides a computer - readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method is implemented.

[0044] Embodiment 3: The embodiment of the present application provides a controller, including a processor and a storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the method.

[0045] Embodiment 4: The embodiment of the present application provides a steering energy - saving control system, including the controller described above.

[0046] Embodiment 5: The embodiment of the present application provides a new - energy electric vehicle, configured with the controller or the steering energy - saving control system.

[0047] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer - usable storage media (including but not limited to disk memory, CD - ROM, optical memory, etc.) containing computer - usable program code.

[0048] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing device generate a means for implementing the functions specified in one or more flows and / or blocks. Figure 1 one or more flows and / or blocks Figure 1 or a means for implementing the functions specified in one or more blocks.

[0049] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction means that implements the functions specified in one or more flows and / or blocks. Figure 1 one or more flows and / or blocks Figure 1 or a means for implementing the functions specified in one or more blocks.

[0050] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flows and / or blocks. Figure 1 one or more flows and / or blocks Figure 1 or a means for implementing the functions specified in one or more blocks.

[0051] The above is only the preferred embodiment of the present application. It should be noted that for those of ordinary skill in the art of this technology, those skilled in the art should understand that without departing from the principles and spirit of the present application, there will be various changes and improvements, and these improvements should also be regarded as the protection scope of the present application and are not limited by the above embodiments.

Claims

1. A steering energy-saving control method, characterized in that, Including: When the enabling condition is met, execute the steering energy-saving control step, and the steering energy-saving control step includes: Determine the first limiting coefficient according to the vehicle speed, the steering wheel steering angle, and the steering torque; Determine the load switch conversion weight according to the light, medium, and heavy load switch signal of the cab; determine the load signal according to the actual vehicle load and the load switch conversion weight; determine the second limiting coefficient according to the load signal; Determine the degree of heat absorption according to the temperature of the steering motor, and determine the third limiting coefficient according to the degree of heat absorption; Multiply the initial speed of the electric power steering pump by the first limiting coefficient, the second limiting coefficient, and the third limiting coefficient to obtain the output speed of the electric power steering pump.

2. The steering energy-saving control method according to claim 1, characterized in that, Determining the first limiting coefficient according to the vehicle speed, the steering wheel steering angle, and the steering torque includes: If the vehicle speed is in the low-speed stage, the first limiting coefficient is K11; If the vehicle speed is in the medium-speed stage, the first limiting coefficient is K12; If the vehicle speed is in the high-speed stage, and the steering wheel steering angle is greater than or equal to the set angle or the steering torque is greater than or equal to the set torque value, the first limiting coefficient is K11; If the vehicle speed is in the high-speed stage, the steering wheel steering angle is less than the set angle and the steering torque is less than the set torque value, the first limiting coefficient is K13; Where K11, K12, and K13 are the values of the first limiting coefficient, and 0 < K13 < K12 < K11 ≤ 1.

3. The steering energy-saving control method according to claim 1, wherein Determining the load switch conversion weight according to the light, medium, and heavy load switch signal of the cab includes: When the light, medium, and heavy load switch of the cab is in the light load state, the load switch conversion weight is the maximum load value × a; When the light, medium, and heavy load switch of the cab is in the medium load state, the load switch conversion weight is the maximum load value × b; When the light, medium, and heavy load switch of the cab is in the heavy load state, the load switch conversion weight is the maximum load value × c; Where a, b, and c are switch conversion coefficients, and 0 < a < b < c < 1; And / or, determining the load signal according to the actual vehicle load and the load switch conversion weight includes: Load signal = actual vehicle load × W1 + load switch conversion weight × W2; Where W1 and W2 are weight coefficients, and W1 + W2 = 1; And / or, determining the second limiting coefficient according to the load signal includes: If 0 ≤ load signal ≤ 30% of the maximum load, the load signal is in the light load state, and the second limiting coefficient is K21; If 30% of the maximum load < load signal ≤ 60% of the maximum load, the load signal is in the medium load state, and the second limiting coefficient is K22; If 60% of the maximum load < load signal, the load signal is in the heavy load state, and the second limiting coefficient is K23; Where K21, K22, and K23 are the values of the second limiting coefficient, and 0 < K23 < K22 < K21 ≤ 1.

4. The steering energy-saving control method according to claim 1, characterized in that, Determining the degree of heat absorption according to the temperature T of the steering motor includes: Normal heat absorption: T ≤ T1; First-level heat absorption: T1 < T ≤ T2 or when it drops from T2 < T ≤ T3 to T ≤ T1; Second-level heat absorption: T2 < T ≤ T3 or when it drops from T3 < T ≤ T4 to T ≤ T2; Third-level heat absorption: T > T4; And / or, determining the third limiting coefficient according to the degree of heat absorption includes: If the degree of heat absorption is normal heat absorption, the third limiting coefficient is K31; If the degree of heat absorption is first-level heat absorption, the third limiting coefficient is K32; If the heating level is the second - level heating, the third limiting coefficient is K33; If the heating level is the third - level heating, the third limiting coefficient is K34; Where K31, K32, K33, and K34 are the values of the third limiting coefficient, and 0 ≤ K34 < K33 < K32 < K31 ≤ 1.

5. The steering energy-saving control method according to claim 1, wherein The initial rotational speed of the electric power steering pump is 1500 rpm.

6. The steering energy-saving control method according to claim 1, characterized in that, The enabling conditions need to satisfy (1) to (5) simultaneously: (1) The vehicle is in a normal high - voltage state; (2) The current gear is not in N gear; (3) The handbrake is released; (4) The steering motor has no third - level faults; (5) The steering motor is in an enabled state.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 1 to 6.

8. A controller, characterized in that, It includes a processor and a storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the method described in any one of claims 1 to 6.

9. A steering energy-saving control system, characterized in that, It includes the controller described in claim 8.

10. A new energy electric vehicle, characterized in that, It is configured with the controller described in claim 8 or the steering energy - saving control system described in claim 9.

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