Semi-intelligent differential lock closed-loop control system and method based on differential lock controller

Abstract

The invention discloses a semi-intelligent differential lock closed-loop control system and method based on a differential lock controller. The method includes the following steps: step S1, collecting the vehicle speed signal in real time, the steering wheel angle signal output by the steering angle sensor, the wheel The inter-wheel / inter-axle differential lock switch signal output by the inter-axle / inter-axle differential lock switch and the ON gear power switch signal output by the ON gear switch; step S2, based on the collected vehicle speed signal and the steering wheel angle signal output by the steering angle sensor , When the inter-wheel / inter-axle differential lock switch signal output by the inter-wheel / inter-axle differential lock switch and the ON gear power switch signal output by the ON gear switch all meet the opening conditions of the inter-wheel / inter-axle differential lock, the drive inter-wheel The inter-axle differential lock solenoid valve controls the work of the inter-wheel / inter-axle differential lock and outputs the inter-wheel / inter-axle differential lock working status indication signal to the instrument to light up the inter-wheel / inter-axle differential lock working indicator in the instrument lamp.

Description

technical field [0001] The invention relates to the technical field of differential lock control, in particular to a semi-intelligent differential lock closed-loop control system and method based on a differential lock controller. Background technique [0002] The differential lock is also called the differential lock. The function of the differential lock is to lock the differential housing and the half shaft together when a driving wheel slips, so that the differential loses its differential effect and can transfer all the torque. onto the other drive wheel. The differential lock solves the problem of power transmission when the car slips on one side, that is, to lock the differential, so that the differential no longer works, and the driving wheels on the left and right sides can get the same torque . [0003] At present, there are basically three types of differential lock control systems: [0004] 1. Whether the differential lock works is directly turned on and off b...

AI Technical Summary

Problems solved by technology

[0004] 1. Whether the differential lock works is directly turned on and off by the switch. The disadvantages of this type of differential lock are as follows: when the differential lock is turned on, there is no working status prompt. When the driver forgets to close the differential lock, the differential lock will work for a long time, and the vehicle When turning, it will cause the axle to hit teeth, and even cause a safety accident

[0005] 2. The Chinese patent application number 201511002591.7 discloses an intelligent control system for differential locks of heavy trucks, which relies on the CAN and LIN bus systems of the vehicle to realize signals such as vehicle speed, wheel speed, key switch and differential lock switch. The intelligent control of the differential lock is realized through a special control strategy and algorithm. The control system is a non-full intelligent differential lock control system. The input conditions of the control system do not consider the steering signal. If the vehicle speed is less than 10km / h and the driver intends to turn, if the differential lock is still working at this time, the control system cannot control the differential lock to automatically quit working, which may cause the axle internal differential. The transmission or half shaft is damaged, and the system does not set the maximum working time of the differential lock. Working for a long time at low speed will also cause the gear oil temperature to rise rapidly and the axle housing to heat up.

However, this control system only considers the vehicle speed, steering wheel angle and left and right wheel speed difference as the conditions for opening and closing the differential lock. It will not be able to control the differential lock to automatically exit, the differential lock will keep working for a long time, the temperature of the gear oil will rise rapidly, and the axle housing will heat up, etc.

The system also does not take into account that if the differential lock is stuck, unable to quit work and other failures, no alarm is set to remind the driver

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