Engine energy comprehensive utilization system and control method

Abstract

The invention discloses a comprehensive energy utilization system for an engine and a control method. The engine is cooled by an organic working medium; the organic working medium is preheated in an engine body; an evaporator is used for transmitting exhaust energy of the engine to the preheated organic working medium, so that the organic working medium is changed into high-temperature and high-pressure gas; by use of an expander, the high-temperature and high-pressure gas is expanded to work; a power coupling device is used for coupling the output shaft work of the expander with the output shaft work of the engine, so that common driving is carried out on a vehicle to enable the vehicle to drive; a crankshaft of the engine drives a working medium pump to pressurize a low-pressure liquid organic working medium into a high-pressure liquid organic working medium, so that a condensing fan is controlled by the temperature, serving as a feedback signal, of the organic working medium at an outlet of an engine cooling water jacket; an electromagnetic three-way valve controls the flowing direction of the organic working medium, and openness and closing of a power coupling device are controlled by taking the rotating speed of the engine and the quasi shaft work of the expander as feedback signals. The organic working medium is used for absorbing the heat dissipating capacity and the exhaust energy of the engine body and converting the heat dissipating capacity and the exhaust energy into power for output, so that high-efficiency utilization of combustion energy of engine fuel is realized.

Description

technical field [0001] The invention belongs to the technical field of energy comprehensive utilization, and relates to an engine energy comprehensive utilization system and a control method. The system uses organic working fluid (non-azeotropic mixed working fluid) as the cooling medium of the engine, absorbs the heat emitted by the engine body, and transfers the exhaust energy of the engine to the organic working medium through the evaporator, so that the organic working medium becomes high temperature and high pressure Gas, the energy of the organic working medium is converted into shaft work output through the expander, and the output shaft of the expander is coupled with the output shaft of the engine to realize the comprehensive utilization of energy, and the comprehensive energy of the engine is adjusted according to the operating status of the engine, evaporator and organic working medium Take advantage of the operating state of the system. Background technique [0...

AI Technical Summary

Problems solved by technology

Using the organic Rankine cycle system to recover the waste heat energy of the engine is currently an ideal way, but it is still in the research stage, and there are problems such as complex structure, power consumption of the working medium pump, and how to use the converted power.

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