Engine and cold starting system and cold starting method thereof

Abstract

The invention provides an engine and a cold starting system and a cold starting method thereof, which do not need any auxiliary starting equipment, and the cold starting system has a simple structure, is easy to implement, and can rapidly and stably implement cold starting. The cold starting system comprises an air cylinder with an intake valve and an exhaust valve, the exhaust valve communicates with an exhaust pipe, the exhaust pipe communicates with a return pipe through a switch, and the return pipe communicates with the intake valve; during starting, the exhaust pipe communicates with the return pipe through the switch, so that exhausted unburnt gas flows back into the air cylinder via the return pipe. The method includes the following steps: gas entering the air cylinder is compressed; the compressed exhausted unburnt gas is led into the air cylinder again, and is compressed again in the next operating cycle; when internal temperature is not lower than the burning point of diesel oil, the oil is injected into the air cylinder to start the engine. Since the unburnt gas which is compressed once flows back into the air cylinder and compressed again, the internal temperature reaches the burning point of the diesel oil, and thereby the rapid cold starting of the engine is realized.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an engine cold start system and method. The invention also relates to an engine having the above-mentioned cold start system. Background technique [0002] Under normal circumstances, the start of an engine at an ambient temperature below minus 8°C is called a cold start. The low-temperature cold start systems commonly used for engines in the prior art mainly include three types, which are the use of auxiliary equipment to preheat the intake air, and the use of Auxiliary equipment preheated coolant type and direct injection of flammable starting fluid type. [0003] The use of auxiliary equipment to preheat the intake air type cold start system is to directly heat the fresh air entering the engine to increase the temperature of the combustion chamber. Specifically, there are two types of auxiliary equipment preheating intake air cold start systems. One uses auxiliary equipment ...

AI Technical Summary

Problems solved by technology

On the one hand, the low-temperature starting fluid is usually filled in a pressure tank, which is prone to deflagration when it encounters high temperature, so it is dangerous to carry it on the vehicle, and the deflagration is often accompanied by the phenomenon of "lack of cylinder", which will damage the crank connecting rod mechanism, etc. The moving parts produce a large mechanical impact; on the other hand, starting fluid is often used to support combustion, and the combustion condition in the cylinder will deteriorate within a short period of time after the diesel engine is started, which will easily cause carbon deposits in the combustion chamber; moreover, if the starting fluid is used for a long time Start-up will lead to certain failures in the fuel system, and the fuel injectors and fuel injection pumps must be calibrated; in addition, this kind of starting fluid is easy to volatilize and produce toxic gases, and frequent use will inevitably damage human health

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