SU717389A1 - Four-cycle engine starting method - Google Patents

Description

, - one . . , The invention relates to internal combustion engines, namely four-stroke diesel engines. Methods are known for starting the internal combustion engine, by compressed air into the working cylinder is supplied at the time of the end of the suction stroke. The disadvantage of this method is a sharp increase in the operation of the charge compression during the compression stroke, which leads to a deceleration of the frequency of rotation of the motor shaft. As a result, engine starting becomes impossible. The aim of the invention is to reduce the engine start time and reduce the flow of compressed air. This is achieved in that, according to the proposed method, compressed air is fed into the working cylinder at the beginning of the all-in-all stroke. To start the engine, use the expansion air of the start-up air during the suction stroke. For its implementation, starting devices, HQ without starting valves, are used. However, the engine must be additionally equipped with an uncoupling device for disconnecting the cylinder head from the intake manifold for the duration of the suction channels. The intake air is supplied during the suction stroke. It begins after 5 rotations of the engine shaft after TDC and ends 70-80 after TDC. After that, the starting air expands in the working cylinder during 50-6 ° rotation of the shaft. The start-up-air expansion work is expended on unwinding the engine / motor shaft, which leads to an increase in charge compression temperature and engine warm-up. When a certain level of compression temperature is reached, conditions for stable combustion of fuel are created, and the engine begins to work. Using the proposed starting method, a four-stroke internal combustion engine allows to reduce the starting time and consumption of starting

3 7173894

air, ensure reliability and vary-compressed air in a working tsipinir,

the safety of the starter and, by the fact that,

simplify the design Radovkilindva .; with chain shortened time

Fbrmul aaaaerv and reduce the consumption of compressed air

The way a piece of chetyrehtak db -§ ha, it is served in the initial period

gatypay, eklyulyutsyutsya in the supply-.tacta suction.

Claims (1)

F δ r m u l & inventions A method for starting a four-stroke engine consisting in ^: “compressed air into a working cylinder, © • characterized by * that, in order to reduce start-up time and reduce the consumption of compressed air, it is supplied in the initial period Suction stroke.