Integrated valve actuating mechanism used for engine driving and braking condition, and its control method

Abstract

The invention discloses an integrated valve drive mechanism used for the driving and braking working conditions of an engine, and a control method thereof; the integrated valve drive mechanism comprises a mechanical drive device and a controller; the mechanical drive device comprises a swing arm, a swing arm shaft, a sliding piston / one-way valve and an electromagnetic braking valve; the controller is used to collect the braking shift signal, and the rotating speed signal and the exhaust reference signal of the engine; according to the rotating speed signal of the engine and the shift signal of a shift selecting handle, the valve timing and the lift range expected valves in the pressure reduction braking and the normal exhaust phases of all cylinders are determined, the current working section of a cam is judged, a control signal is output to regulate the starting pressure of the electromagnetic braking valve. When the valve drive mechanism disclosed by the invention is used, only a pressure reduction braking molded line is needed to be added on the exhaust cam of the prior engine, the normal exhaust molded line does not need to be changed, so that the size of the cam is reduced; the valve time and lift range of the valve can be automatically regulated according to different working conditions, so as to improve the performance of the engine under the driving and the braking working conditions.

Description

technical field [0001] The invention relates to a valve drive mechanism and a control method of an engine capable of realizing decompression braking, in particular to an integrated valve drive mechanism and a control method that can be used in both engine drive and brake conditions. Background technique [0002] When the engine decompression retarder is performing decompression braking, it temporarily converts the engine into an air compressor to assist the main braking system of the car in braking. The braking power of a properly designed engine decompression retarder is basically equal to the driving power, and may even exceed the driving power. [0003] With the development of technology and the requirements of the market, in order to improve the performance of the engine retarder, reduce the number and size of parts and reduce the weight of the engine, people began to try to integrate the retarder parts with the existing parts of the engine. A typical method is to add a...

AI Technical Summary

Problems solved by technology

[0012] (1) The cam profile is complex. In addition to the decompression braking profile, part of the normal exhaust profile is invalid, and the radial dimension of the normal exhaust profile needs to be increased

[0013] (2) When the engine brakes, the valve timing and lift cannot be automatically adjusted according to the working conditions

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