Ignition supercharging type engine braking method

Abstract

The invention discloses an ignition supercharging type engine braking method, and belongs to the technical field of engine braking. The method particularly comprises the following steps that 1, an electronic control unit sends out a signal to an engine supply system at an intake stroke stage, and combustible mixed gas serves as a working medium to be sucked into a cylinder; 2, a crankshaft position signal of a crankshaft sensor is collected through the electronic control unit, an instruction is given out to an ignition device after a compression stroke is started, the combustible mixed gas in the cylinder is ignited, and a fuel gas compression stage is conducted; 3, before a piston reaches top dead center at a compression stroke, the electronic control unit controls an electronic control unit to be switched on, gas in the cylinder is exhausted, and a working and exhausting stage is conducted. According to the ignition supercharging type engine braking method, the compression working medium is high-pressure gas obtained after combustion of the combustible mixed gas; compared with an air working medium, on the condition that the air inflow is the same, resistance can be greatly increased by controlling chemical and physical state changes of the gas intake working medium of the engine at different time and changing an ignition working medium, and therefore braking power is greatly increased.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of engine braking, and in particular relates to an ignition boost type engine braking method. [0003] Background technique: [0004] Based on the requirements of high-speed and efficient road transportation, the total mass of heavy-duty trucks is large, and the speed is getting higher and higher. When the whole vehicle is on a long slope with heavy loads, the main braking system of the vehicle itself cannot meet the requirements of the vehicle under high-speed and heavy-load conditions. braking requirements. In order to ensure the safety performance of the vehicle, an auxiliary braking device must be added. Engine braking is to use the mechanical loss, pumping loss and compression work of the engine to generate the braking function through the turning of the car to the engine, thereby increasing the braking power of the car. [0005] When the whole vehicle is going down long slopes, rugged mountain...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to make up for the shortage of the above-mentioned service braking power, and to provide a pressurized engine braking method that ignites the compressed working medium, which can be applied to ignition-type heavy-duty engines such as natural gas and gasoline; it is especially suitable for The total mass of the vehicle is large, and relying solely on the main brake of the vehicle itself cannot meet the braking requirements of the vehicle under high-speed and heavy-load conditions.

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