A commercial vehicle hydraulic automatic transmission integrated with an electronically controlled hydraulic retarder

Abstract

The invention discloses a commercial vehicle hydraulic automatic transmission where an electric control hydraulic retarder is integrated. The commercial vehicle hydraulic automatic transmission comprises a transmission casing, a power input device, at least one group of planetary gear trains, at least one group of rotating clutches and brake clutches, a hydraulic valve group, a solenoid valve group, at least one electric control unit, at least one group of sensors and the auxiliary brake device hydraulic retarder, wherein the transmission casing comprises a front part and a rear part; the power input device comprises a hydraulic torque converter; the at least one group of planetary gear trains are used for transmitting power; the at least one group of rotating clutches and the brake clutches are used for achieving gear shifting of the hydraulic automatic transmission; the hydraulic valve group and the solenoid valve group are used for controlling gear shifting and achieving an auxiliary braking function and quality; the at least one electric control unit is used for providing control signals and collecting various sensor signals; the at least one group of sensors are used for testing various state parameters of the hydraulic automatic transmission; and the auxiliary brake device hydraulic retarder is installed on the rear portion of the hydraulic automatic transmission. A high-performance controller of the hydraulic automatic transmission and a hydraulic system of the hydraulic automatic transmission are utilized to enable the hydraulic retarder to be in real-time reliable reasonable matching with the transmission, the cost is reduced, and running safety of a whole vehicle is improved.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a commercial vehicle hydraulic automatic transmission integrated with an electronically controlled hydraulic retarder. Background technique [0002] Commercial vehicles and engineering vehicles often work in different road environments. With the improvement of power system capabilities today, the load of commercial vehicles is increasing and the driving speed is increasing. However, the size of existing vehicles and the brake drum and The diameter of the tires remains unchanged, which places higher demands on the braking systems of commercial vehicles. For commercial vehicles such as passenger cars, as people pay more and more attention to safety, the installation of auxiliary braking devices other than service braking is also more and more necessary. [0003] Previous hydraulic automatic transmissions were usually mechanically controlled, with at most a small number of elec...

AI Technical Summary

Problems solved by technology

[0005] During the braking process of a car, most of the braking is adaptive braking, that is, the vehicle does not need to brake to stop, but to achieve the purpose of deceleration. The application of retarder braking instead of frequent braking of the brake can reduce the overheating of the main brake The danger of losing the braking effect in an emergency, and the danger of brake failure due to overheating of the brake disc or drum due to overheating of the brake disc or brake drum due to long-distance downhill deceleration while driving in mountainous areas, and a sharp drop in the friction coefficient of the brake pads

Frequent operations such as starting, shifting, and braking during the operation of urban buses have the greatest impact on the vehicle because of the high failure rate of clutches and brakes and short service life

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