Unlock instant, AI-driven research and patent intelligence for your innovation.

Diagnostic device and method for fuel pump of IC engine

A diagnostic device and diagnostic method technology, applied in the direction of fuel injection device, measuring device, low-pressure fuel injection, etc., capable of solving problems such as replacement

Inactive Publication Date: 2004-07-14
HITACHI LTD
View PDF1 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] So usually, if a diagnostic fails, both the motor unit and the pump unit are replaced, resulting in the non-failed unit being replaced unnecessarily

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Diagnostic device and method for fuel pump of IC engine
  • Diagnostic device and method for fuel pump of IC engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] exist figure 1 In the shown internal combustion engine 1 , an electromagnetic fuel injection valve 3 is arranged on the intake port 2 .

[0015] Fuel is injected through the fuel injection valve 3 to form an air-fuel mixture in the combustion chamber of the engine 1 .

[0016] This air-fuel mixture is combusted by spark ignition of the spark plug 4 .

[0017] The fuel in the fuel tank 5 is sucked out by the fuel pump 6 provided in the fuel tank 5 , and the fuel discharged from the fuel pump 6 is sent to the fuel injection valve 3 through the fuel pipe 7 .

[0018] The fuel pump 6 includes a motor unit 6a and a pump unit 6b.

[0019] The motor unit 6a and the pump unit 6b are constructed separately from each other and can therefore be replaced separately.

[0020] The pump unit 6b is a turbo (type) pump that sucks and discharges fuel according to the rotation of the impeller.

[0021] Reference numeral 6c denotes a fuel filter provided on the inlet of the pump unit 6...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

When a fuel pressure on the downstream side of a fuel pump for an internal combustion engine is less than a slice level, it is judged whether or not an applied voltage on a motor unit and / or the power consumption in the motor unit are normal. In the case where the motor unit is not failed, it is estimated that the pump unit is failed.

Description

technical field [0001] The invention relates to a diagnostic device and a diagnostic method for a fuel pump that supplies fuel to an internal combustion engine. Background technique [0002] Japanese Patent Laid-Open Sho: 63-052962 discloses a device having a device for detecting the discharge pressure of a fuel pump for diagnosing an abnormality in the fuel pump based on the discharge pressure. [0003] There is a case where a motor unit and a pump unit which together constitute a fuel pump are provided so that they can be replaced separately. [0004] In the case of using the fuel pump described above, if failure diagnosis can be performed for each unit, only the failed unit can be replaced. [0005] However, there are cases where normal discharge pressure cannot be obtained due to failure of the motor unit, and cases where normal discharge pressure cannot be obtained due to failure of the pump unit. [0006] Therefore, in the structure in which the diagnosis is performe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F02M37/04F02D41/06F02D41/22F02D41/30F02M37/08F02M37/10F02M65/00F02M69/46G01M13/00G01M99/00
CPCF02M37/10F02M65/003F02D2200/503F02D41/064G01M13/00F02D2200/0604F02D41/3082F02M69/46F02D41/221F02D2200/0602
Inventor 细谷肇
Owner HITACHI LTD