Preheating method and preheating system for cold start of engine

Abstract

The invention discloses a preheating method and a preheating system for the cold start of an engine. The preheating method includes the steps of monitoring the external work environment temperature of an automobile engine in real time, and comparing the external work environment temperature with a lower preset temperature value and a higher preset temperature value; if the external work environment temperature is larger than the higher preset temperature value, starting the engine directly; if the external work environment temperature is smaller than or equal to the higher preset temperature value and larger than the lower preset temperature value, heating intake air and fuel oil of the engine for second scheduled time and then starting the engine; and if the external work environment temperature is smaller than or equal to the lower preset temperature value, heating engine oil and a coolant liquid of the engine for first scheduled time, and determining whether the engine oil temperature is larger than or equal to an engine oil expected value, if yes, starting the engine, or otherwise, heating the intake air and the fuel oil of the engine for the second scheduled time and then starting the engine. The preheating system is simple in structure and high in heating efficiency.

Description

technical field [0001] The invention relates to the field of engines, in particular to an engine cold start preheating method and a preheating system. Background technique [0002] Improper cold start of the engine has great harm to the fuel consumption, performance, life and environment of the engine, which is mainly reflected in the following points: 1) The temperature of the engine body and various components is low, and part of the fuel in the oil-air mixture sticks to the manifold, On the intake port, more fuel injection is required to compensate, which increases the fuel consumption of the engine. 2) Low-temperature starting oil has low temperature and high viscosity, which increases the starting resistance torque and has stricter requirements on the starter and battery; at the same time, the movement pairs cannot be lubricated in a timely and effective manner, which increases wear and shortens the service life. 3) Accelerate the wear of the cylinder wall and reduce t...

AI Technical Summary

Problems solved by technology

[0002] Improper cold start of the engine has great harm to the fuel consumption, performance, life and environment of the engine, which is mainly reflected in the following points: 1) The temperature of the engine body and various components is low, and part of the fuel in the oil-air mixture sticks to the manifold, On the intake port, more fuel injection is required to compensate, which increases engine fuel consumption

2) Low-temperature starting oil has low temperature and high viscosity, which increases the starting resistance torque and has stricter requirements on the starter and battery; at the same time, the movement pairs cannot be lubricated in time and effectively, which will aggravate wear and reduce service life

3) Accelerate the wear of the cylinder wall and reduce the service life; the worn metal chips will fall into the oil pan, shortening the oil replacement cycle; and the combustion chamber is prone to air leakage

4) The air intake and fuel temperature are low, the atomization effect is poor, the combustion is not complete or even flameout, resulting in high hydrocarbon (HC) emissions

Existing automobile engines generally heat the coolant or engine oil of the automobile engine by setting a preheating device to achieve cold start; time, which increases both mechanical loss and cost

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