Engine exhaust brake control system and control method

Abstract

The invention discloses an engine exhaust brake control system and a control method. According to the invention, in the automatic exhaust brake opening control process, under the brake state and the condition that a clutch is not separated, a control unit is used for collecting an engine rotation speed and a brake disc temperature signal, when the engine rotation speed is lower than a set limiting value and the brake disc temperature exceeds a set limiting value, the control unit controls an electromagnetic valve to act, so as to realize automatic closing of a butterfly valve; in the pressure regulation feedback control process, after the butterfly valve is closed, the control unit collects an exhaust pipe back pressure signal, and when the exhaust pipe back pressure exceeds a limiting value, the control unit controls the butterfly valve to be opened, and after the pressure is reduced, the automatic exhaust brake opening control process is performed again; in the automatic exhaust brake completing process, when the control unit collects any signal that a driver steps on a clutch pedal or an accelerator pedal or the driver loosens a brake pedal, the butterfly valve is opened, and the exhaust brake is ended. According to the invention, automatic control about exhaust brake is realized, the control accuracy is high, secondary opening of an exhaust valve is avoided, and the braking efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of modern traffic, and relates to an auxiliary braking system, in particular to an engine exhaust control system and a control method. Background technique [0002] When the car is driving up and downhill or on highways and city streets, it often needs to perform frequent braking of different intensities. In order to avoid the braking performance degradation or failure caused by the temperature rise of the braking system, many vehicles are currently equipped with auxiliary brakes. braking system to help the vehicle slow down or maintain a steady speed, thereby improving braking efficiency. [0003] The existing exhaust auxiliary brake adopts switch control. When the driver presses the switch button, the solenoid valve works, so that the exhaust brake cylinder pushes the rocker arm, drives the butterfly valve to close, and the exhaust brake is turned on. Working light. Because this traditional mechanism req...

AI Technical Summary

Problems solved by technology

[0004] When the traditional exhaust auxiliary brake is working, due to the closure of the exhaust butterfly valve, the back pressure in the exhaust pipe will gradually increase, and finally it will overcome the spring preload and open the exhaust valve, resulting in the phenomenon of secondary opening of the exhaust valve. , which reduces the auxiliary braking efficiency and shortens the service life of the exhaust valve components

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