www.public4you.fora.pl

njlpkhgea

Automobile exhaust gas recirculation system and improvement of the application

Load conditions,[link widoczny dla zalogowanych], a large impedance through the throttle valve. And the engine speed corresponding to the inspiratory impedance (pump depletion) produces reactive fuel consumption. Pump to reduce engine wear and tear, usually increasing the throttle opening of the proper mixture of gas combustion in the thin and large load setting in the suction side of the EGR valve control number. High EGR rates in order to maintain stability even under conditions of combustion, eliminating EGR on the power, the negative economic effects,[link widoczny dla zalogowanych], often using a number of rapid combustion of the measures. Not only to strengthen the mixture inside the cylinder turbulence intensity and the ignition energy, while direct injection of fuel into the combustion chamber, high-precision control of combustion, etc., should be improved to maximize. Figure 1 Relationship between air-fuel ratio and exhaust components of the new EGR system 3 Improved Special lean mixture in the combustion mode, the catalyst for NO reduction usually can not function effectively, it is more and more important way by EGR. Figure 2 shows Mitsubishi's GDI engine in the automotive industry to reduce the effect of NO. EGR rate of 30% (up to the original engine is only about 20%). 3.1 GDI engine in the original problem in the system to reduce harmful gas and the fuel economy of dual purpose, the need for more so than the original implementation within the EGR control. However, when the throttle opening in the large negative pressure produced by smaller, can not run a large range of proper and efficient operation of EGR valve. Figure 3 Figure 3 shows the negative control type EGR system vacuum La. 0z car and loop pressure control system (EGR valve with a membrane-type throttle downstream of the negative pressure inside the suction tube as the driving source) is not applicable. New EGR Valve, \type EGR valve source. Figure 4. 3.2 Stepper Motor EGR valve EGR valve as the characteristics of actuators, stepper motors are ideal. And linear solenoid valves and DC servo motor drive comparison,[link widoczny dla zalogowanych], it has the following advantages: (1) driving force is relatively large, the control flow driven by a linear solenoid valve 3-4 times; (2) in the exhaust pulse, etc. under the influence of external forces, the valve opening to maintain the stability of the good; (3) Needless to position detection control,[link widoczny dla zalogowanych], and low cost; (4) compared with the negative control, the system structure is simple. Table 1, its population out of gasoline engine EGR valve with a stepper motor type of the performance parameters. 1 capsule-type EGR valve stepper motor performance of the engine for the common engine for the C-D1 model PMPM motor 4848 motor torque financial poles / NmO. o35O. Power Consumption / w13192 stroke / mm58.5 maximum flow / L · rainI1200800 minimum resolution Fu / L-rain49 accuracy /% 883.3 New motor-driven control valve device we can see from Table l,[link widoczny dla zalogowanych], direct injection gasoline engine valves and usually use the ECR comparison engines, EGR valve flow is 4 times the latter. As the need for greater driving force, the motor will need more power and size in order to prevent the shut valve exhaust gas leakage. Figure 5, a new type of motor drive to improve the control valve. In the exhaust channel and suction channel opening and closing the valve between the valve shaft fixed. Off valve in the direction of the valve shaft by suction on the closing spring; in the direction of opening the valve by opening the valve spring to push down the motor shaft, structure, close the valve spring force in the opposite direction to accelerate the addition of spring. Open the valve spring to open the valve under the direction of thrust and speed up the spring in the direction of the suction valve closure force is balanced, which reduces the stepper motor in the open valve when the driving force necessary, and in the spring and close the valve after the accelerated Isolation valves to ensure that the power off valve. This improvement has been made in the United States Patent (Patent No. 5,351,935). The motor-driven control valve device using only a small motor to close the valve with enough force. 4 Conclusion Figure 5 the new Motor-driven control valve EGR technology, for improving automobile emission pollution has played a positive effect, with the social aspects of environmental protection and energy conservation requirements of continuous improvement, the technology has been improved, negative pressure control type EGR system can not meet the requirements, instead of the new motor drive control EGR system to make up for the lack of the former, with good prospects for the use of