Equipment and method for controlling high-pressure common rail system of diesel engine

Abstract

The invention discloses equipment and a method for controlling a high-pressure common rail system of a diesel engine. The equipment comprises a working condition parameter acquisition device, a controlled quantity confirmation device and a driving signal confirmation device, wherein the working condition parameter acquisition device is used for acquiring working condition parameters related to the high-pressure common rail system; the controlled quantity confirmation device is coupled to the working condition parameter acquisition device and is used for confirming the controlled quantity used for controlling the high-pressure common rail system according to the working condition parameter, the target value of the intracavity fuel pressure of a high-pressure common rail pipe and a control module designed on the basis of a physical model of the system, wherein the controlled quantity is the equivalent cross-sectional area of a solenoid valve of a flow-measurement unit; and the driving signal confirmation device is coupled to the controlled quantity confirmation device and is used for confirming a driving signal, which is used for driving the flow-measurement unit, according to the confirmed controlled quantity. According to the implementation mode, the invention is suitable for the work processes of the system under any working conditions, more precise injection pressure and the rapid response can be realized, the deviation between the rail pressure and the target value of the rail pressure is reduced, the demarcated workload can be reduced and the functions of the system are improved.

Description

technical field [0001] The present invention generally relates to the technical field of diesel engines, and more particularly relates to an apparatus and method for controlling a high-pressure common rail system of a diesel engine. Background technique [0002] With the increasingly serious energy crisis, various energy-saving technologies have become the focus of attention of the internal combustion engine industry around the world. It is also for this reason that diesel engines are receiving more and more attention. Diesel engines have many advantages over gasoline engines: lower exhaust emissions, better acceleration at lower speeds, lower average fuel consumption and more driving pleasure. However, compared with gasoline engines, emission control of diesel engines is another difficulty. In order to meet emission standards, high-pressure common rail technology has become a hot spot in the industry. [0003] In the existing high-pressure common-rail fuel injection syst...

AI Technical Summary

Problems solved by technology

In addition, based on the existing PID control strategy, under certain operating conditions of the engine, there will be a large deviation between the actual value of the rail pressure and the target value of the rail pressure, which leads to the actual injection of fuel in the fuel injection system. There is a large error between the fuel injection quantity and the target fuel injection quantity, which directly affects the power of the engine and the consistency of fuel injection of each cylinder

Images