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engine control unit

A control device and engine technology, applied in engine control, engine components, combustion engines, etc., can solve problems such as turbo lag

Active Publication Date: 2022-04-19
SUBARU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Patent Document 3 describes that although the air bypass valve is opened when the target air flow rate through the throttle valve is below the surge generation upper limit flow rate, and the occurrence of surge is prevented when the air bypass valve is opened However, since there may be a problem of turbo lag at the time of re-acceleration due to the reduction in boost pressure, the period during which the air bypass valve is open is set to the minimum necessary

Method used

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Experimental program
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no. 1 approach ＞

[0076] Hereinafter, a first embodiment of an engine control device to which the present invention is applied will be described.

[0077] The engine control device according to the first embodiment is a device provided in a turbocharged gasoline engine mounted in an automobile such as a passenger car as a driving power source.

[0078] figure 1 It is a figure which schematically shows the structure of the engine provided with the engine control apparatus of embodiment.

[0079] Such as figure 1 As shown, the engine 1 is configured to include a main body 10 , an intake device 20 , an exhaust device 30 , a turbocharger 40 , a fuel supply device 50 , an engine control unit (ECU) 100 , and the like.

[0080] The main body 10 is the main unit of the engine 1 , for example, a four-stroke DOHC gasoline direct injection engine with horizontally opposed four cylinders.

[0081] The main body 10 is configured to include a crankshaft 11 , a cylinder block 12 , a cylinder head 13 , an i...

no. 1 approach

[0294] As described above, according to the first embodiment, the following effects can be obtained.

[0295] (1) When the target opening degree of the throttle valve 26 is fully opened, by keeping the throttle valve 26 fully open and closing the wastegate valve 44 , all the exhaust gas can be supplied to the turbine 42 for The compressor 41 can be driven, and the pre-rotation of the turbocharger 40 can be started to increase the rotation of the compressor 41 .

[0296] It should be noted that in general, when the throttle valve 26 is fully opened and the wastegate valve 44 is maintained in the closed state, although there is a possibility that the main body of the engine 1 will be charged due to excessive supercharging. Hardware such as the (main unit) 10 or the turbocharger 40 causes damage, but in the present invention, by opening the air bypass valve 24 and returning air from the downstream side of the compressor 41 to the upstream side, it is possible to Prevent excessiv...

no. 2 approach ＞

[0302] Next, a second embodiment of an engine control device to which the present invention is applied will be described.

[0303] The engine controlled by the engine control device of each embodiment described below has a hardware configuration common to that of the first embodiment, unless otherwise specified, and will be described below with the same reference numerals as those of the first embodiment.

[0304] The engine control device of the second embodiment is characterized in that, in the supercharging increase control, after the target opening degree of the throttle valve 26 becomes equal to or greater than the threshold value (the first condition is met), the air bypass valve 24 is opened to start the operation. Based on the elapsed time from the start, it is determined whether or not the engine speed Ne has reached the threshold value or more (satisfied the second condition).

[0305] Figure 6 It is a flowchart showing supercharging increase control in the engine ...

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Abstract

The present invention provides an engine control device capable of obtaining a characteristic that acceleration increases after acceleration starts. An engine control device (100) for controlling an engine includes: a turbocharger (40) having a turbine (42) and a compressor (41); A valve (24); a wastegate valve (44) provided in a flow path connecting the upstream side and the downstream side of the turbine; a throttle valve (26) arranged in an area on the downstream side of the compressor in the intake flow path ), the engine control device (100) is configured to execute the supercharging increase control: when the throttle valve is in the open state and the first condition is satisfied, the air bypass valve is in the open state and the wastegate valve is in the closed state , and then when the second condition is satisfied, the air bypass valve is closed and the wastegate valve is closed.

Description

technical field [0001] The present invention relates to an engine control device for controlling a turbocharged engine. Background technique [0002] A turbocharger is a supercharger that uses a turbine driven by exhaust gas from an engine to operate a compressor that compresses combustion air (fresh air). [0003] The turbine of the turbocharger is provided with a wastegate valve for the purpose of controlling supercharging, etc., and the wastegate valve opens and closes a flow path provided to bypass the turbine. [0004] In recent years, a technique in which the wastegate valve is an electric type and can control the opening degree arbitrarily has been popularized. [0005] In addition, in the compressor of the turbocharger, for the purpose of suppressing surge caused by suddenly closing the throttle valve from the supercharged state, an air bypass valve is provided, and the air bypass valve is opened and closed to bypass the compressor. The flow path set by the machine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B37/18F02B37/16F02D41/00
CPCF02B37/183F02B37/16F02D41/0007F02D2200/0404F02D2200/101F02D2200/60F02B37/186F02B37/24F02M26/50Y02T10/12
Inventor 村松幸之助金田知之
Owner SUBARU CORP