Expansion ratio adjustable pneumatic engine for automobile and its exhaust pressure control method

Abstract

The invention relates to a pneumatic engine for car use and discloses a pneumatic engine for car use with an adjustable expansion ratio and an exhaust pressure control method. According to the pneumatic engine for car use with the adjustable expansion ratio, compressed air is expanded in a cylinder so as to propel a piston and drive a crankshaft to rotate through a connecting rod and output rotating mechanical work to the outside. The pneumatic engine is characterized in that the pneumatic engine comprises an air inlet electromagnetic valve which is arranged in a cylinder air inlet pipe, an exhaust electromagnetic valve which is arranged in a cylinder exhaust pipe, a pressure sensor which is used for detecting the air pressure inside the cylinder, a photoelectric encoder which is used for detecting a crankshaft rotation angle, and a controller; and the controller makes a policy according to the cylinder air pressure detected by the pressure sensor and the crankshaft rotation angle of the photoelectric encoder, and sends a control signal of opening or closing to the air inlet electromagnetic valve and the exhaust electromagnetic valve. The pneumatic engine reduces the compressed air available energy loss caused by high pressure exhaust, thereby improving the energy conversion rate of the pneumatic engine.

Description

technical field [0001] The invention relates to a vehicle pneumatic engine, in particular to a vehicle pneumatic engine with an adjustable expansion ratio and a method for controlling the exhaust pressure thereof. Background technique [0002] The pneumatic engine is an important component of the power system of a zero-pollution, environment-friendly and energy-saving vehicle. Its function is to convert the effective energy of compressed air into the rotational mechanical energy required to drive the vehicle. [0003] Existing pneumatic motors for vehicles generally consist of parts such as a motor body, a pressure reducing valve, a flow regulating valve, an air storage tank and an air pipeline. The compressed air is stored in the air storage tank. When the air motor is working, the compressed air flows through the air pipeline, pressure reducing valve, flow regulating valve, air inlet, cylinder and exhaust port, and finally is discharged into the atmosphere. The pressure r...

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Problems solved by technology

[0006] In order to overcome the shortage of low effective energy utilization rate of the existing vehicle air engine due to decompression loss and exhaust loss, the present invention provides a vehicle air engine with adjustable expansion ratio, which can avoid the existing vehicle air engine. Effective energy loss of the engine in the decompression link and exhaust link, improving the energy conversion efficiency of the pneumatic engine

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