An electric power steering pump control method and system

Abstract

The application discloses a kind of electric power steering pump control method and system, belong to automobile steering technical field, method includes: the vehicle state is defined by the vehicle signal read;According to vehicle state configuration corresponding electric power steering pump operating mode: when vehicle is in shutdown state, set electric power steering pump is in shutdown mode, does not carry out power output;When vehicle is in parking state, set electric power steering pump after delay preset time, enter shutdown mode;When vehicle is in straight-ahead state, set electric power steering pump is in low power speed mode;When vehicle is in low-speed turning state, set electric power steering pump is in rated power speed mode;When vehicle is in high-speed turning state, set electric power steering pump is in low power speed mode.The application solves the problem that driver drives vehicle, the difference requirement of low speed and high speed steering sense is difficult to meet.

Description

Technical Field

[0001] This invention relates to the field of automotive steering technology, and in particular to an electric steering pump control method and system. Background Technology

[0002] Traditional gasoline-powered vehicles use a steering pump as the power source for steering, driven by the engine. Current new energy electric trucks use an electric motor as the core power source, without a pre-installed power take-off port for the steering pump. Therefore, the steering system of new energy electric vehicles uses an electric steering pump for power. Current electric steering pumps operate at a constant speed and flow rate, meaning they run at maximum speed and rated flow rate at all vehicle speeds and steering angles.

[0003] The resulting impacts include two aspects: firstly, it fails to meet the driver's subjective driving needs for different steering sensations at low and high speeds (lighter steering at low speeds and more stable steering at high speeds); secondly, it negatively affects energy consumption, impacting the vehicle's range. Furthermore, the current electric power steering pump's start / stop is controlled by handbrake signals, gear signals, and vehicle speed signals. If the parking action is not fully completed (steering wheel not returned to center), the electric power steering pump is prone to stopping, and the hand force cannot overcome the ground's return torque, causing the steering wheel to turn rapidly, resulting in a steering wheel kickback and affecting the driving experience. Summary of the Invention

[0004] The purpose of this invention is to provide an electric power steering pump control method and system. By reading vehicle signals to define the vehicle state, and then configuring a corresponding electric power steering pump operating mode for that vehicle state, this method can meet the driver's needs for different steering sensations at low and high speeds, and achieve the goals of reducing energy consumption and increasing driving range. This invention is achieved through the following technical solutions.

[0005] In a first aspect, the present invention provides an electric power steering pump control method, comprising: The vehicle status is defined by reading the vehicle signals; the vehicle status includes stopped status, parked status, straight-ahead status, low-speed turning status and high-speed turning status. Configure the corresponding electric power steering pump operating mode according to the overall vehicle status: When the vehicle is in a stopped state, the electric power steering pump is set to stop mode and does not output power. When the vehicle is in a parked state, the electric power steering pump is set to enter the stop mode after a preset delay of 5 seconds from the previous working mode. When the vehicle is in a straight-line state, the electric power steering pump is set to low power speed mode. When the vehicle is in a low-speed turning state, the electric power steering pump is set to the rated power speed mode. When the vehicle is in a high-speed turning state, the electric power steering pump is set to a low-power speed mode.

[0006] Optionally, the vehicle signals include gear position signal, handbrake signal, ignition signal, vehicle speed signal, and steering wheel angle signal.

[0007] Optionally, the vehicle state may also include a transition state from a low-speed turning state to a high-speed turning state.

[0008] Optionally, it can be determined whether the gear position signal is N or P and whether the handbrake signal is engaged. If none of these conditions are met, it can be determined whether there is an ignition signal. If there is no ignition signal, the vehicle status is defined as a stopped state.

[0009] Optionally, if the gear signal is N or P and the handbrake signal is engaged, and there is an ignition signal, then determine whether the current vehicle speed is 0. If the current vehicle speed is 0, then define the vehicle status as parked.

[0010] Optionally, if the current vehicle speed is not 0, determine whether the current steering wheel angle is greater than or equal to a preset angle of 30°. If it is greater than or equal to, determine whether the current vehicle speed is less than or equal to a first preset speed of 30 km / h. Otherwise, define the vehicle state as a straight-going state.

[0011] Optionally, if the current vehicle speed is less than or equal to the first preset speed of 30 km / h, the vehicle state is defined as a low-speed turning state; otherwise, it is determined whether the current vehicle speed is greater than the second preset speed of 50 km / h.

[0012] Optionally, if the current vehicle speed is greater than the second preset speed of 50 km / h, the vehicle state is defined as a high-speed turning state; otherwise, the vehicle state is defined as a transition state from a low-speed turning state to a high-speed turning state.

[0013] Optionally, when the vehicle is transitioning from a low-speed turning state to a high-speed turning state, the electric power steering pump is set to transition from the rated power speed mode to the low power speed mode.

[0014] Secondly, the present invention provides an electric power steering pump control system, comprising: The reading module is used to define the vehicle status by reading the vehicle signals; wherein, the vehicle status includes stopped status, parked status, straight-ahead status, low-speed turning status and high-speed turning status; The operating mode configuration module is used to configure the corresponding operating mode of the electric power steering pump according to the vehicle status: When the vehicle is in a stopped state, the electric power steering pump is set to stop mode and does not output power. When the vehicle is in a parked state, the electric power steering pump is set to enter the stop mode after a preset delay of 5 seconds from the previous working mode. When the vehicle is in a straight-line state, the electric power steering pump is set to low power speed mode. When the vehicle is in a low-speed turning state, the electric power steering pump is set to the rated power speed mode. When the vehicle is in a high-speed turning state, the electric power steering pump is set to a low-power speed mode.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The electric power steering pump control method introduced in this invention defines the vehicle state by reading vehicle signals, and then configures a corresponding electric power steering pump operating mode for the vehicle state: For the parking state, the electric power steering pump is set to enter a stop state after a 5-second delay, allowing the driver sufficient time to straighten the wheels or remove their hands from the steering wheel, preventing hand slippage; For the straight-driving state, the electric power steering pump is set to a low-power speed mode, which can reduce energy consumption and increase driving range; For the low-speed turning state, the electric power steering pump is set to a rated power speed mode, which can ensure that the driver's hand strength is light when turning the steering wheel, without fatigue, and improve the driving experience; For the high-speed turning state, the electric power steering pump is set to a low-power speed mode, which can ensure that the driver's steering wheel is relatively stable and avoids deviation with the slightest touch; For the transition state from low speed to high speed, the electric power steering pump is set to a transition mode from rated power speed mode to low power speed mode, adapting to the driver's sensory needs. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic flowchart of an electric steering pump control method in one embodiment of the present invention. Figure 2 The diagram shown is a flowchart illustrating the process of determining the vehicle status and configuring the corresponding working mode in one embodiment of the present invention. Detailed Implementation

[0017] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details. In this description, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0018] Example 1 This embodiment describes a control method for an electric power steering pump, such as... Figure 1 As shown, it includes the following: The vehicle status is defined by reading the vehicle signals; the vehicle status includes stopped status, parked status, straight-ahead status, low-speed turning status and high-speed turning status. Configure the corresponding electric power steering pump operating mode according to the overall vehicle status: When the vehicle is in a stopped state, the electric power steering pump is set to stop mode and does not output power. When the vehicle is in a parked state, the electric power steering pump is set to enter the stop mode from the previous working mode after a preset delay time. When the vehicle is in a straight-line state, the electric power steering pump is set to low power speed mode. When the vehicle is in a low-speed turning state, the electric power steering pump is set to the rated power speed mode. When the vehicle is in a high-speed turning state, the electric power steering pump is set to a low-power speed mode.

[0019] Example 2 Based on Example 1, this example describes the specific implementation process of an electric power steering pump control method, such as... Figure 2 As shown, it specifically includes the following: In one specific embodiment of the present invention, the vehicle signals include gear position signal, handbrake signal, ignition signal, vehicle speed signal, and steering wheel angle signal.

[0020] In one specific embodiment of the present invention, the vehicle state also includes a transition state from a low-speed turning state to a high-speed turning state.

[0021] In one specific embodiment of the present invention, it is first determined whether the gear signal is N or P and whether the handbrake signal is engaged. If none of these conditions are met, it is determined whether there is an ignition signal. If there is no ignition signal, the vehicle state is defined as a stopped state.

[0022] When the vehicle is stopped, the electric power steering pump is stationary and no operation is required. The electric power steering pump is set to stop mode and does not output power.

[0023] If the gear signal is N or P and the handbrake signal is engaged, and there is an ignition signal, then determine if the current vehicle speed is 0. If the current vehicle speed is 0, then define the vehicle status as parked.

[0024] When the vehicle is parked, the power steering pump stops working, immediately eliminating the power assist. If the wheels are in a turning position after losing power assist, the steering system will be unable to overcome the self-centering torque generated by the vehicle's weight. This will cause the steering wheel to turn rapidly, posing a risk to the driver's safety. To address this, a 5-second delay is set to allow the driver sufficient time to straighten the wheels or remove their hands from the steering wheel, preventing the steering wheel from kicking back. Therefore, when the vehicle is parked, the power steering pump is set to switch from the previous operating mode to the shutdown mode after a 5-second delay.

[0025] If the current vehicle speed is not 0, determine whether the current steering wheel angle is greater than or equal to the preset angle of 30°. If it is greater than or equal to, determine whether the current vehicle speed is less than or equal to the first preset speed of 30km / h. Otherwise, define the vehicle state as straight driving state.

[0026] When the vehicle is traveling straight, the wheels are in the center position, the drop arm is in its initial position, the torque transmission efficiency is at its highest, and the driver only makes small (≤±15°) steering wheel corrections. In this state, the vehicle's flow and torque demands are minimal. The electric power steering pump, operating at low power, can meet the driver's steering assist needs. Compared to continuous rated power output, this reduces energy consumption and increases driving range. Therefore, when the vehicle is traveling straight, the electric power steering pump is set to a low-power speed mode.

[0027] If the current vehicle speed is less than or equal to the first preset speed of 30 km / h, the vehicle state is defined as a low-speed turning state; otherwise, it is determined whether the current vehicle speed is greater than the second preset speed of 50 km / h.

[0028] When the vehicle is turning at low speed, often in situations such as stopping, making U-turns, or changing lanes in traffic jams, the driver's need for steering is more focused on ease of use. Therefore, the vehicle outputs its rated power flow and pressure in this state to ensure that the steering wheel is easy to handle, does not tire the hands, and enhances the driving experience.

[0029] If the current vehicle speed is greater than the second preset speed of 50 km / h, the vehicle state is defined as a high-speed turning state; otherwise, the vehicle state is defined as a transition state from a low-speed turning state to a high-speed turning state.

[0030] When the vehicle is transitioning from a low-speed turning state to a high-speed turning state, considering the change in vehicle speed and in order to adapt to the driver's driving sensory needs, the electric power steering pump is set to transition from the rated power speed mode to the low power speed mode.

[0031] When the vehicle is in a high-speed turning state, the vehicle is turning at a high speed. Considering that the steering action will cause the vehicle to tilt, the driver's steering needs are more focused on stability. Therefore, the vehicle outputs flow and pressure according to the rated power in this state to ensure that the steering wheel is easy to handle.

[0032] Example 3 This embodiment describes an electric power steering pump control system, including: The reading module is used to define the vehicle status by reading the vehicle signals; wherein, the vehicle status includes stopped status, parked status, straight-ahead status, low-speed turning status and high-speed turning status; The operating mode configuration module is used to configure the corresponding operating mode of the electric power steering pump according to the vehicle status: When the vehicle is in a stopped state, the electric power steering pump is set to stop mode and does not output power. When the vehicle is in a parked state, the electric power steering pump is set to enter the stop mode after a preset delay of 5 seconds from the previous working mode. When the vehicle is in a straight-line state, the electric power steering pump is set to low power speed mode. When the vehicle is in a low-speed turning state, the electric power steering pump is set to the rated power speed mode. When the vehicle is in a high-speed turning state, the electric power steering pump is set to a low-power speed mode.

[0033] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A control method for an electric power steering pump, characterized in that, include: The vehicle status is defined by reading the vehicle signals; the vehicle status includes stopped status, parked status, straight-ahead status, low-speed turning status and high-speed turning status. Configure the corresponding electric power steering pump operating mode according to the overall vehicle status: When the vehicle is in a stopped state, the electric power steering pump is set to stop mode and does not output power. When the vehicle is in a parked state, the electric power steering pump is set to enter the stop mode from the previous working mode after a preset delay time. When the vehicle is in a straight-line state, the electric power steering pump is set to low power speed mode. When the vehicle is in a low-speed turning state, the electric power steering pump is set to the rated power speed mode. When the vehicle is in a high-speed turning state, the electric power steering pump is set to a low-power speed mode.

2. The electric power steering pump control method according to claim 1, characterized in that, The vehicle signals include gear position signal, handbrake signal, ignition signal, vehicle speed signal, and steering wheel angle signal.

3. The electric power steering pump control method according to claim 1, characterized in that, The vehicle state also includes the transition state from low-speed turning to high-speed turning.

4. The electric power steering pump control method according to claim 3, characterized in that, Determine whether the gear position signal is N or P and whether the handbrake signal is engaged. If none of these conditions are met, determine whether there is an ignition signal. If there is no ignition signal, define the vehicle status as stopped.

5. The electric power steering pump control method according to claim 3, characterized in that, If the gear signal is N or P and the handbrake signal is engaged, and there is an ignition signal, then determine if the current vehicle speed is 0. If the current vehicle speed is 0, then define the vehicle status as parked.

6. The electric power steering pump control method according to claim 5, characterized in that, If the current vehicle speed is not 0, determine whether the current steering wheel angle is greater than or equal to the preset angle. If it is greater than or equal to the preset angle, determine whether the current vehicle speed is less than or equal to the first preset speed. Otherwise, define the vehicle state as straight driving state.

7. The electric power steering pump control method according to claim 6, characterized in that, If the current vehicle speed is less than or equal to the first preset speed, the vehicle state is defined as a low-speed turning state; otherwise, it is determined whether the current vehicle speed is greater than the second preset speed.

8. The electric power steering pump control method according to claim 7, characterized in that, If the current vehicle speed is greater than the second preset speed, the vehicle state is defined as a high-speed turning state; otherwise, the vehicle state is defined as a transition state from a low-speed turning state to a high-speed turning state.

9. The electric power steering pump control method according to claim 8, characterized in that, When the vehicle is transitioning from a low-speed turning state to a high-speed turning state, the electric power steering pump is set to transition from the rated power speed mode to the low power speed mode.

10. An electric power steering pump control system, characterized in that, include: The reading module is used to define the vehicle status by reading the vehicle signals; wherein, the vehicle status includes stopped status, parked status, straight-ahead status, low-speed turning status and high-speed turning status; The operating mode configuration module is used to configure the corresponding operating mode of the electric power steering pump according to the vehicle status: When the vehicle is in a stopped state, the electric power steering pump is set to stop mode and does not output power. When the vehicle is in a parked state, the electric power steering pump is set to enter the stop mode from the previous working mode after a preset delay time. When the vehicle is in a straight-line state, the electric power steering pump is set to low power speed mode. When the vehicle is in a low-speed turning state, the electric power steering pump is set to the rated power speed mode. When the vehicle is in a high-speed turning state, the electric power steering pump is set to a low-power speed mode.

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