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Torque control method and system for electric power-assisted transport vehicle

A technology of torque control and electric power assist, which is applied in the field of torque control methods and systems for electric power-assisted transport vehicles, can solve problems such as complex calculation of torque control methods, achieve good steering control road feeling, and solve the effects of complex calculations

Inactive Publication Date: 2020-04-17
HENAN BENMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a torque control method for an electric power-assisted transport vehicle, which is used to solve the problem of complex calculation in the existing torque control method

Method used

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  • Torque control method and system for electric power-assisted transport vehicle
  • Torque control method and system for electric power-assisted transport vehicle
  • Torque control method and system for electric power-assisted transport vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) When turning, detect the torque of the steering wheel; the torque sensor 2 detects the torque of the steering wheel in real time, and the control unit receives the torque sensor of the steering wheel;

[0031] 2) Judgment: If the current torque is less than the first set torque value, the power assist characteristic of the power assist motor is zero; if the current torque is greater than the first set torque value and less than the second set torque value, the power assist motor The boost characteristic of the motor increases with the increase of the current torque. If the current torque is greater than the second set torque value, the boost characteristic of the boost motor is a constant value; combined with the judgment of the boost characteristic curve, the current boost current I , the power assist characteristic curve function is:

[0032]

[0033] Among them, T d0 is the first set torque value, and the first set torque value represents the corresponding ste...

Embodiment 2

[0038] 1) When turning, detect the torque of the steering wheel; the torque sensor 2 detects the torque of the steering wheel in real time, the vehicle speed sensor Va detects the current vehicle speed, and the control unit receives the signals detected by the steering wheel torque sensor and the speed sensor;

[0039] 2) Judgment: If the current torque is less than the first set torque value, the power assist characteristic of the power assist motor is zero; if the current torque is greater than the first set torque value and less than the second set torque value, the power assist motor The boost characteristic of the motor increases with the increase of the current torque. If the current torque is greater than the second set torque value, the boost characteristic of the boost motor is a constant value; combined with the judgment of the boost characteristic curve, the current boost current I ,Such as figure 2 As shown, the assist characteristic curve function is:

[0040] ...

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Abstract

The invention relates to a torque control method and system for an electric power-assisted transport vehicle. When the vehicle steers, the torque of a steering wheel is detected, a signal is transmitted to a controller, the controller correspondingly controls the motor after analysis and processing, and the torque output by the motor is transmitted to a gear and rack steering gear through a speedreducing mechanism and finally output to a turning wheel through a transmission shaft. Specifically, a linear power-assisted characteristic curve is adopted and comprises three areas, namely, a non-power-assisted area, a power-assisted change area and a power-assisted constant area; when the vehicle is parked, steered at a low speed or steered during medium-high speed driving, the running speed ofthe vehicle is detected by a running speed sensor, the detected signals are transmitted to the control unit to have corresponding assistance characteristics, and different assistance currents are applied to the motor to change the rotating speed of the motor, so that the variability of the torque during steering is achieved, and good steering control road feel is guaranteed. The problem that an existing torque control method is complex in calculation is solved.

Description

technical field [0001] The invention belongs to the technical field of automobile steering, and in particular relates to a torque control method and system for an electric power-assisted transport vehicle. Background technique [0002] At present, most automobiles still use the hydraulic power steering system (HPS). The power assist characteristics of the steering system are fixed, that is, the power steering power is not adjusted correspondingly with the change of vehicle speed. Electric power steering (EPS) and electrohydraulic power steering (EHPS) can make the car light when steering at low speeds and stable at high speeds. However, due to their limited power, they are not suitable for heavy vehicles with large front axle loads. The driver's steering feel and road feel at various vehicle speeds depend on the power assist characteristics of ECHPS, and the power assist characteristics of ECHPS at various vehicle speeds are related to the structural parameters of the rotary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/04
CPCB62D5/046
Inventor 吕振伟豆中旭朱永智王红军
Owner HENAN BENMA
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