Turbocharged engine and its control method and control device
A turbocharger and engine technology, applied in engine control, combustion engine, engine components, etc., can solve problems such as serious pressure relief noise, and achieve the effects of reducing pressure relief noise, preventing surge, and reducing air pressure
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no. 1 example
[0087] An embodiment of the present invention provides a turbocharged engine, referring to figure 1 Shown, comprise: intake pipe 1, exhaust pipe 2, and turbocharger 3, turbocharger 3 comprises impeller 3a and turbine 3b that are coaxially connected, and impeller 3a is arranged in intake pipe 1, and turbine 3b is located at Inside the exhaust pipe 2.
[0088] The exhaust pipe 2 is communicated with a first pressure relief pipe 4, along the exhaust direction ( figure 1 Middle solid line shaded arrow indicates direction), one end of the first pressure relief pipe 4 communicates with the exhaust pipe 2 at the upstream of the turbine 3b, and the other end communicates with the exhaust pipe 2 at the downstream of the turbine 3b. A first pressure relief valve 5 is arranged in the first pressure relief pipe 4 . In this embodiment, the first pressure relief valve 5 is an electronically controlled valve.
[0089] When the first pressure relief valve 5 is opened, part of the exhaust g...
no. 2 example
[0100] The embodiment of the present invention also provides a control method for the turbocharged engine of the first embodiment, refer to figure 2 and combine figure 1 As shown, the control method includes:
[0101] Judging whether the pressure of the intake pipe 1 of the engine in the area downstream of the impeller 3a exceeds the preset pressure;
[0102] When the pressure in the area downstream of the impeller 3a exceeds the preset pressure, an opening command is sent to control the opening of the first pressure relief valve 5;
[0103] When the pressure in the area downstream of the impeller 3a does not exceed the preset pressure, a closing instruction is sent to control the closing of the first pressure relief valve 5 .
[0104] Wherein, in the engine equipped with turbocharger 3, the impeller 3b is installed in the intake pipe 1, and then the intake pipe 1 is divided into two parts, one part is located upstream of the impeller 3a along the intake direction, and the ...
no. 3 example
[0142] The difference between the present embodiment and the second embodiment is that when judging whether the pressure of the intake pipe 1 of the engine in the area downstream of the impeller 3a exceeds the preset pressure, the judging basis is different.
[0143] refer to Figure 4 , in this embodiment, when judging whether the pressure of the intake pipe 1 of the engine in the area downstream of the impeller 3a exceeds the preset pressure, the judging basis includes:
[0144] S21: Obtain the current air flow demand of the engine intake pipe 1;
[0145] S22: Obtain the current air flow of the intake pipe 1 downstream of the impeller 3a;
[0146] S23: Determine whether the current air flow is greater than the air flow requirement:
[0147] When the judgment result of S23 is yes, enter S24: determine that the pressure of the intake pipe 1 of the engine in the area downstream of the impeller 3a exceeds the preset pressure;
[0148] When the determination result of S23 is n...
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