Method capable of realizing unloading during engine braking and engine starting and stopping

Abstract

The invention relates to a method capable of realizing unloading when an engine is braked or the engine is started or stopped, which is composed of a servovalve mechanism and an oil circuit controlling mechanism and is characterized in that the servovalve mechanism comprises a locknut, a stop collar, a stretching screw, a piston, a check ring and a piston spring; and the oil circuit controlling mechanism comprises a solenoid valve, a control valve, a control valve clamp spring, a control valve return spring and a braced frame. The stop collar, the piston, the check ring and the piston spring move downward under the function of oil pressure to push a slide valve on an engine valve bridge in order to open an exhaust valve about 1 mm before the engine is started. Under the two conditions that the engine is started or stopped, the initial resistance of the compression stroke can be reduced when the engine is started, the resisting moment is decreased when a starting engine rotates a crankshaft and the service life of the starting engine is prolonged; under the condition of braking, the exhaust value is opened at an angle before a top dead center is compressed, and the engine which is equivalent to an air compressor consumes kinetic energy to slow a vehicle in order to achieve the braking effect. The invention has the advantages of simple structure and control system and high response speed; and the engine consumes the least energy in the whole starting process, which improves the economy of the whole engine.

Description

technical field [0001] The invention relates to a method capable of realizing engine braking and unloading when the engine starts and stops, and belongs to the field of engine braking and maintenance. Background technique [0002] As the total mass of modern vehicles is increasing and the vehicle speed is increasing, relying solely on the vehicle's own main braking system can no longer meet the braking requirements of the vehicle under high-speed and heavy-load conditions. In addition, the existing engine uses a traditional starter motor in the starting process. When the engine is frequently stopped / started, the starting is unstable, and the starter needs to overcome the maximum resistance torque, which reduces the life of the starter. Contents of the invention [0003] The purpose of the present invention is to provide a method that can realize engine braking and unloading when the engine starts and stops, which can reduce the starting torque, prolong the life of the star...

AI Technical Summary

Problems solved by technology

[0002] As the total mass of modern vehicles is increasing and the vehicle speed is increasing, relying solely on the vehicle's own main braking system can no longer meet the braking requirements of the vehicle under high-speed and heavy-load conditions.

In addition, the existing engine uses a traditional starter motor during the starting process. When the engine is frequently stopped / started, the start is unstable, and the starter needs to overcome the maximum resistance torque, which reduces the life of the starter.

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