Programmable logic control device for automobile transmission case with manual gearshift

Abstract

The invention provides a programmable logic control device of hand-operated shift vehicle speed change box, which comprises a shift operation rod, a switch sensor, a CPLD main control module, an electric control shift valve, the A cylinder and the B cylinder. Wherein, the switch sensor comprises stage switch sensors and cylinder positioned switch sensors, while the stage switch sensors are mounted at the each stage of vehicle shift operation rod base to connect the power resource and the CPLD main control module; the CPLD main control module is connected to the drive coil of electric control shift valve; the electric control shift valve is connected to the A cylinder and the B cylinder; the A and B cylinders are individually connected to the speed change gear device of speed change box; the cylinder positioned switch sensors are mounted at the outer walls of A cylinder and B cylinder to connect the power resource and the CPLD main control module; the speed sensor is mounted inside the speed change box to connect the CPLD main control module. The invention uses the 7064S CPLD in MAXII system of Altera Company as the main control module which has simple structure, easy operation, high control speed, stable operation and stronger anti-disturb ability.

Description

technical field [0001] The invention relates to automobile gearbox equipment, in particular to a programmable logic control device for a manual shift gearbox and a shift control method thereof. Background technique [0002] Existing trucks such as buses, coaches and commercial trucks, due to their flat-top car structure, have established conditions for installing the transmission in space, that is, the transmission must be moved to a place far away from the driver's seat, especially when When the car has an engine under the compartment or a rear engine, the distance between the transmission and the driver's seat is relatively long, and in the transmission with mechanical shifting, the structure of the shift lever system is complicated, the power transmission distance is long, and it is difficult to shift gears accurately. The inter-stress effect is large, and the mutual wear is also large. [0003] The gear shift control of the domestic hydraulic power shift gearbox is usua...

AI Technical Summary

Problems solved by technology

The disadvantage of the above-mentioned mechanical shifting is that when using the handle to push the manual hydraulic shifting valve, it generally requires about 30N of force, and the labor intensity of the driver's hand is very high.

[0004] At present, there are also a small number of gearbox electronic control devices designed for this type of rear engine using a general-purpose single-chip microcomputer (such as MCS51, etc.), but experiments have shown that the gearbox electronic control device designed with a single-chip microcomputer uses a single-chip microcomputer. The working environment of the electronic control device is relatively harsh. In addition, the single-chip microcomputer runs through the program. The bad working environment will easily cause the single-chip microcomputer to be disturbed and the program will run away. This phenomenon will lead to incorrect gear shifting. It is absolutely not allowed to have incorrect gear shifting in a car, because if the gear shifting is incorrect, it will cause damage to mechanical devices such as gearbox gears, and it will cause serious traffic accidents if it is serious.

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