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Fuel injection pressure control device

A technology of fuel injection and controller, which is applied in the direction of fuel injection control, fuel injection device, electrical control, etc., which can solve the problems of engine stalling and inability to fully absorb the reduction of common rail pressure, etc.

Inactive Publication Date: 2008-08-06
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case where the acceleration overspeed is performed before the learning correction process is completed and the chart error (control deviation) at that time is large, such a decrease in the common rail pressure cannot be sufficiently absorbed
As a result, there is a possibility that the common rail pressure (corresponding to the injection pressure) drops below the possible lower limit of injection (that is, leaves the possible range of injection), resulting in engine stall due to injection failure

Method used

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Embodiment Construction

[0033] Now, a fuel injection pressure controller according to an embodiment of the present invention will be described with reference to the accompanying drawings. The controller of the present embodiment is installed in a common rail fuel injection control system (high pressure injection fuel supply system) to control, for example, a reciprocating diesel engine as an automobile engine. Same as the device described in Patent Document 1, the controller of this embodiment is a fuel injection pressure controller of a diesel engine (internal combustion engine), which directly injects high-pressure fuel (such as light oil with an injection pressure of 1000 atm or more) and The controller performs feedback-control (PID control) so that the fuel injection pressure conforms to a target value when supplied into a combustion chamber of a cylinder of a diesel engine.

[0034] First, with reference to FIG. 1 , the gist of the common rail fuel injection control system of the present embodi...

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Abstract

The fuel injection pump control device controls a fuel-injector pressure from the injection supply eliminated by the variables of determined measured parameters. The fuel is injected and supplied to a target machine. A learning correction process-implementing device is provided for successive implementation of multiple kinds of learning correction process corresponding to the multiple implemented conditions. The implemented conditions are different in the strictness for a pressure parameter of pressurized parameter as a learning object and are used for the fuel injection pressure controller.

Description

technical field [0001] The present invention relates to a fuel injection pressure controller which controls the fuel injection pressure while performing fuel injection supply to an engine. For example, the present invention relates to a fuel injection pressure controller suitable for use in a common rail fuel injection system for a diesel engine. Background technique [0002] As is well known, an internal combustion engine used as a power source of an automobile or the like ignites and burns fuel supplied from a fuel supply system to generate output torque. That is, at the time of engine control, the performance (characteristics) of the fuel supply system is an important factor for determining the output characteristics of the engine. In recent years, also, fuel supply systems, diesel engines or the like have adopted a common rail fuel injection system that accumulates and retains high-pressure fuel (for example, at about 1400 atm) in the common rail (accumulator) light oi...

Claims

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Application Information

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IPC IPC(8): F02D41/04F02D45/00F02M47/02
CPCF02D41/3845F02D41/2445F02D41/2464F02D2041/1409F02D2200/0606F02D2250/31
Inventor 大工武彦
Owner DENSO CORP
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