Combustion chamber air interchanger without disturbance to three-way catalyst and oxygen sensor

Abstract

The invention discloses a combustion chamber air interchanger without disturbance to a three-way catalyst and an oxygen sensor. The air interchanger comprises a combustion chamber composed of a piston with motion close to an upper dead center, an air cylinder, a cylinder cover and an air pumping mechanism or an air blow mechanism. An air feeding mechanism and an air exhaust mechanism are communicated with an air inlet and an air outlet of the combustion chamber through an air inlet tube and an air outlet tube. The three-way catalyst and the oxygen sensor are arranged in the air outlet tube, and the oxygen sensor is connected with a computer through a line to control the oil spray amount of an oil injector. In an exhaust stroke of a motor, the air pumping mechanism pumps residual waste air from the combustion chamber when the air exhaust mechanism closes the air outlet in advance and opens an air inlet valve, or the air blow mechanism blows away residual waste air from the combustion chamber when the air exhaust mechanism closes the air outlet in advance and the air feeding mechanism opens the air inlet in advance. According to the non-interface air interchanger, operation environments of the three-way catalyst and the oxygen sensor are not affected while the waste air is exhausted, the operation efficacy of the three-way catalyst is maintained, instructions of the oxygen sensor are not interfered, and normal operation conditions of the motor is guaranteed.

Description

(1) Technical field: [0001] The invention relates to the electric injection engine technology, in particular to a combustion chamber ventilating device which does not interfere with the operation of a three-way catalytic converter and an oxygen sensor. (2) Background technology: [0002] With the development of automobile industry technology, the engine has entered the EFI era from the carburetor era. In order to obtain a high exhaust purification rate, the EFI engine can reduce carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides in the exhaust. components (NOx) and other harmful components, to reduce exhaust pollution, it is necessary to use the three-way catalytic converter for secondary combustion and element decomposition. , HC and NOx purification capabilities will drop sharply. In order to effectively use the three-way catalytic converter, the air-fuel ratio must be precisely controlled so that it is always close to the theoretical air-fuel ratio, and the meas...

AI Technical Summary

Problems solved by technology

[0009] The positive effect of the scavenging method is: by cleaning the engine exhaust, the high-temperature oxygen-free exhaust gas is evacuated, the temperature before the intake of the cylinder is reduced, the air density and oxygen content of the new air are increased, and the fuel combustion efficiency and engine power are improved; The negative effect of the scavenging method is: the temperature of the three-way catalytic converter in the exhaust gas and the oxygen content in the exhaust gas are changed, resulting in a decrease in the efficiency of the three-way catalytic converter, and the oxygen sensor sends out wrong instructions, resulting in errors in fuel injection volume and duration, making the engine not working properly

Images