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Equipment for controlling diesel engine

A technology for controlling equipment and diesel engines, applied in mechanical equipment, engine control, electrical control, etc., can solve the problems of time-consuming boost pressure, inability to protect the turbocharger, etc.

Inactive Publication Date: 2008-07-30
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, even if the above-mentioned fail-safe method limits the output by reducing the injection quantity, the state of high engine speed (such as the inertia state of gear meshing) will continue
Therefore, it still takes time for the boost pressure to actually decrease after the injection quantity has been reduced
Therefore, it may not be possible to achieve sufficient protection for the turbocharger

Method used

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  • Equipment for controlling diesel engine
  • Equipment for controlling diesel engine
  • Equipment for controlling diesel engine

Examples

Experimental program
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Embodiment Construction

[0015] Referring to FIG. 1 , the figure shows an air system of a diesel engine according to an embodiment of the present invention.

[0016] The diesel engine shown in FIG. 1 includes injectors 2 mounted on cylinder heads of individual cylinders 1 . High-pressure fuel supplied from the common rail is supplied into the combustion chamber 1 a inside the cylinder 1 via the injector 2 . An electronic control unit (ECU) 3 controls the injection timing and injection quantity of the injector 2 based on the rotation speed and load (accelerator position) of the diesel engine and the like.

[0017] The diesel engine shown in FIG. 1 has an EGR device (exhaust gas recirculation device) for recirculating part of the exhaust gas into the intake passage 4 and a variable geometry turbocharger (variable nozzle turbocharger). A diesel engine throttle valve 5 for adjusting the intake air volume is placed in the intake passage 4 .

[0018] The EGR device includes an EGR passage 7 for connecting...

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Abstract

The invention relates to a device which can protect the turbine supercharger, which is characterized in that if the actual boost pressure exceeds the preset second allowable upper limit boost pressure, then the electronic control unit (3) executes the second protection control for protection of the turbine supercharger. In the second protection control, the injection volume is eliminated and the exhaust gas recirculation valve (EGR valve) (8) is kept fully open. The EGR gas which has entered into the inlet passage (4) through the recirculation in the EGR passage (7) increases rapidly while the exhaust energy acting on the exhaust gas turbine (10) of the turbine supercharger decreases greatly. Therefore, the device has the advantages that the excess of the boost pressure can be eliminated rapidly and the turbine supercharger is prevented from rotational overspeed, thus the turbine supercharger is protected.

Description

technical field [0001] The invention relates to a diesel engine control device with a variable geometry turbocharger. Background technique [0002] Traditionally, it is very important to increase the air intake amount as much as possible in a diesel engine so as to increase the output per unit displacement. Therefore, many diesel engines use a variable geometry turbocharger (variable nozzle turbocharger) to perform detailed control of the air intake amount. [0003] A variable geometry turbocharger has a variable nozzle at the inlet of the exhaust gas turbine, and the variable nozzle is driven by an actuator to change the opening of the nozzle. If the actuators are not properly controlled, the boost pressure will increase excessively and the speed of the turbocharger (exhaust gas turbine and compressor) will overspeed. As a result, adverse effects on the turbocharger can result. [0004] As a solution to the above-mentioned problem, there are described in JP-A-H10-503569 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02B37/00F02B37/12F02M25/07F02B39/16F02B37/24F02D21/08F02D23/00F02D41/02F02D41/22F02D43/00F02D45/00
CPCF02D41/0055F02M25/0707F02D41/0007F02D2200/0406Y02T10/47Y02T10/144F02D23/02F02M25/0731F02M26/05F02M26/28Y02T10/12Y02T10/40
Inventor 内山贤
Owner DENSO CORP