Inner combustion engine fuel supercritical ejection system and controlling method

Abstract

The invention discloses an inner combustion engine fuel supercritical ejection system and a controlling method. The system mainly comprises an oil inlet pipe, an oil return pipe, an electromagnetic flow valve, a high-pressure oil pump, an ECU, a heat exchanger, a normally closed safety valve, a pressure sensor, heater wire, a pressure stabilizing cavity, a temperature sensor, an oil spraying device, a first one-way valve, a second one-way valve, a fuel filter, an oil tank and other structures. On the basis of existing high-pressure common-rail oil supplying system, a shell-and-tube heat exchanger is added in a gas exhaust pipe for recovering heat in tail gas and for conducting initial heating of fuel; and the method that the ECU is arranged for controlling heating power of the heater wireto realize auxiliary heating is adopted, so the fuel in the pressure stabilizing cavity reaches a supercritical status. The system can make full use of the heat in the tail gas and realize auxiliary heating through flexible electric heating system, and the system is more energy-saving, high-efficiency and stable.

Description

technical field [0001] The present invention relates to an internal combustion engine fuel supercritical injection system, in particular to an internal combustion engine fuel supercritical injection system and a control method. Background technique [0002] Supercritical refers to the state in which the temperature and pressure of a substance exceed its critical pressure and critical temperature at the same time. A fluid in this state has a viscosity much lower than its liquid state and a diffusion coefficient much greater than its liquid state. The combustion of an internal combustion engine is an irreversible process in which the fuel-air mixture formed by liquid fuel is ignited in a suitable thermodynamic state through high-pressure injection and other means, and the chemical energy of the fuel is converted into heat energy. For modern engines, the speed is high and the combustion reaction time is short, and the combustion process is controlled by the fuel injection atom...

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Problems solved by technology

However, domestic research on supercritical injection of reciprocating piston internal combustion engines is less. The existing patent CN107806386A uses electric heating to make the fuel reach the critical temperature. When the temperature is too high, the temperature control strategy of cooling water cooling is adopted. In general, the temperature control strategy of using high-grade electric energy for heating combined with cooling water will inevitably lead to irrational use of energy

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