Simulation torque sensor based on NE555 design for EPS

Abstract

The invention discloses a simulation torque sensor based on NE555 design for an EPS. Comprising two circuit systems, each of the two circuit systems comprises an NE555 chip, second pins of the two NE555 chips are electrically connected with a diode D2 and a diode D4 respectively, one end of the diode D2 is electrically connected with a resistor R2, one end of the diode D4 is electrically connected with a resistor R6, one end of the resistor R2 is electrically connected with an RV1A potentiometer, and the other end of the resistor R2 is electrically connected with a resistor R7. One end of the resistor R6 is electrically connected with an RV1B potentiometer, one end of the RV1A potentiometer is electrically connected with a resistor R1, and one end of the RV1B potentiometer is electrically connected with a resistor R5; square waves with adjustable duty ratio can be output by adjusting the potentiometer, a torque sensor signal is simulated, the EPS enters a power-assisted working state, the tedious process of frequently changing EPS controller programs in the testing process and the disassembling and assembling process are avoided, the structural quality of the EPS controller is protected, and the service life of EPS controller hardware is prolonged.

Description

technical field [0001] The invention belongs to the technical field of torque sensors for EPS, in particular to an analog torque sensor for EPS designed based on NE555. Background technique [0002] During the testing process of EPS (electric power steering) controller, such as life test, temperature test, vibration test, EMC test, etc., it is necessary for the EPS controller to drive the motor to rotate to judge whether the EPS controller is working normally. In the prior art, it is generally possible to test by modifying the EPS controller program and changing it to the rotation program. This method needs to reprogram the EPS controller. For the EPS controller without CAN communication function, the heat sink of the controller needs to be disassembled. Program programming can only be performed after dismantling the controller. This method is time-consuming and laborious. Repeated dismantling of the controller will cause irreversible damage to the sealing of the controller....

AI Technical Summary

Problems solved by technology

In the prior art, it is generally possible to test by modifying the EPS controller program and changing it to the rotation program. This method needs to reprogram the EPS controller. For the EPS controller without CAN communication function, the heat sink of the controller needs to be disassembled. Program programming can only be performed after dismantling the controller. This method is time-consuming and labor-intensive. Repeatedly dismantling the controller for many times will cause irreversible damage to the sealing of the controller.

[0003] Traditional torque sensor integration and EPS assembly mechanical structure, bulky and not easy to carry

In the test of brushless EPS products, it is necessary to use the hand force applied to the input shaft or use a special test bench to judge whether the EPS product is working normally, which is time-consuming and laborious

When collecting the PWM waveform of the EPS controller drive motor, the current situation should be connected to the test bench. The operator turns the steering wheel with one hand and uses the oscilloscope probe to detect the test points of the EPS controller, which is inconvenient to operate.

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