Turbocharged gasoline engine system with pulse width regulating valve and method for controlling supercharging pressure

Abstract

A turbocharged gasoline engine system with a pulse widening valve and a method for controlling the supercharging pressure, which is to control the supercharging pressure entering the actuator by adding a pulse widening valve to the turbocharged gasoline engine system, The added pulse width control valve has three gas circuit interfaces a, b, c and an electrical signal interface d, the gas circuit interface at the a end is connected with the outlet pipe of the turbocharger compressor, and the air circuit interface at the b end is connected with the air intake of the actuator The port c is connected, the c-end gas circuit port is connected with the intake pipe of the turbocharger compressor, and the electrical signal port d is connected with the engine ECU signal output port. The engine ECU receives the detection signals from the intercooler pressure sensor, intercooler temperature sensor, throttle position sensor, engine speed sensor, engine exhaust temperature sensor, and engine exhaust manifold oxygen content sensor, and then sends the duty ratio signal to the pulse width adjustment The valve controls the boost pressure entering the actuator to achieve the purpose of regulating the waste gas bypass volume.

Description

Technical field [0001] The invention relates to the technical field of gasoline engine turbochargers, in particular to a turbocharged gasoline engine system with a pulse widening valve and a method for controlling the boost pressure of an entering actuator by using a pulse widening valve. Background technique [0002] According to statistics from the automotive industry, the European gasoline engine turbocharging technology market share has been steadily increasing year by year since 2004. In 2004, the market share of turbocharged gasoline engines was only 10%. After just four years, the market share of turbocharged gasoline engines has soared to 21% in 2008 and is expected to increase to 30% by 2011. This shows that turbocharged gasoline engines have gradually replaced naturally aspirated gasoline engines in the market and have become the mainstream of engine technology development. [0003] The traditional turbocharged gasoline engine adds a turbocharger to the existing gasoline...

AI Technical Summary

Problems solved by technology

[0013] 2. In the calibration, the boost pressure of some operating conditions at the torque point will be close to the rated point boost pressure, or even higher than the rated point boost pressure. The waste gas bypass technology cannot flexibly control the turbo boost pressure according to the engine design point. It cannot meet the torque demand of the entire working point, it can only reduce the engine power and economic indicators, and affect the promotion of turbocharging technology on gasoline engines

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