Thermal protection control method for automatic transmission box or stepless transmission box

Abstract

The invention discloses a thermal protection control method for an automatic transmission box or a stepless transmission box, belonging to the field of transmission box thermal protection control, wherein a control mechanism comprises a transmission box control unit TCU which carries out communication through a whole vehicle CAN bus, an engine management system EMS and an instrument board module ICM. The thermal protection control method for the automatic transmission box or the stepless transmission box comprises the following control steps of measuring the temperature of oil for the transmission box; comparing the measured temperature of the oil for the transmission box with a set high-temperature threshold; and when the temperature of the oil for the transmission box is higher or lowerthan a corresponding high-temperature threshold, executing a corresponding protection step. The technical scheme provided by the embodiment of the invention has the advantages that through coordination work of the TCU, the EMS and the ICM, a system can carry out operations of warning, fan operation, speed ratio control, torque restriction and the like in time, thereby efficiently preventing the temperature of the oil for the transmission box from rising too fast or too high in time and supplying reliable protection to normal work of a transmission box transmission mechanism and a hydraulic system.

Description

technical field [0001] The invention relates to the technical field of thermal protection control of automobile transmissions, in particular to a thermal protection control method for automatic transmissions or continuously variable transmissions. Background technique [0002] With the rapid development of electronic technology and automatic control technology, high-performance automotive automatic transmissions are constantly being pushed to the market by domestic and foreign automobile manufacturers. The feeling of "fun" and the performance of low fuel consumption and low emission have gradually been recognized, and the loading rate of automatic transmissions in the market is getting higher and higher, and the scope of use is becoming wider and wider. [0003] In an automotive automatic transmission composed of a hydraulic torque converter and a gear planetary system or a pulley transmission mechanism, the automatic transmission oil (ATF for short) not only plays the role ...

AI Technical Summary

Problems solved by technology

When the automatic transmission vehicle is driven for a long time under high temperature or a large slope, the automatic transmission system maintains high-load operation, and the ATF oil temperature rises to high temperature too quickly, resulting in poor lubrication of the transmission mechanism and excessive leakage of the hydraulic system, reducing the The working oil pressure of the clutch and transmission system is damaged, resulting in abnormal gear shifting, steel belt slipping and other faults

Repeatedly doing so can cause irreparable damage to key components such as clutch friction plates or metal belts, which not only brings large economic losses to customers, but also affects the safety and controllability of the entire vehicle during driving.

[0004] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the existing automatic transmission or continuously variable transmission oil, when driving for a long time under the conditions of high temperature or a large slope, the oil The temperature is easy to rise too fast, which will cause the car to malfunction and damage, and affect the safety and handling of the car

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