Fuel jetting controller for internal combustion engine

A technology of control device and fuel injection, which is applied in the direction of fuel injection device, fuel injection control, engine control, etc., and can solve problems such as deterioration of restartability at high temperature, deterioration of restartability, failure to deliver fuel, etc.

Inactive Publication Date: 2002-12-11
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Therefore, when the recirculation valve fails, the fuel may not be delivered when the engine is started, and when the fuel temperature is high, the high-temperature restart performance may be deteriorated due to the return of the fuel.
[0019] In addition, in the case of the latter conventional device (JP-A-9-421090), since it is necessary to add a fuel temperature sensor or a fuel pressure sensor, there is a problem of cost increase.
[0020] Conventional fuel injection control devices for internal combus

Method used

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  • Fuel jetting controller for internal combustion engine
  • Fuel jetting controller for internal combustion engine
  • Fuel jetting controller for internal combustion engine

Examples

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Embodiment 1

[0038] Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

[0039] figure 1 It is a schematic structural diagram of Example 1 of the present invention.

[0040] in figure 1 In the engine 1, an intake pipe 2 for introducing intake air and an exhaust pipe 3 for guiding exhaust gas after combustion are provided.

[0041] The intake pipe 2 is provided with an air filter 4, an intake air temperature sensor 5, an air flow sensor 6, a throttle valve 7 and a nozzle 8 from the upstream side.

[0042] The intake pipe sensor 5 detects the intake air temperature of the engine 1, and the air flow sensor 6 detects intake air amount information corresponding to the intake air amount introduced into the engine 1.

[0043] The throttle valve 7 adjusts the amount of intake air to the engine 1, and the nozzle 8 injects fuel on the upstream side of the engine 1.

[0044] Contains an ECU (Electronic Control Device) 17 and a microcomputer t...

Embodiment 2

[0088] In the first embodiment described above, the control of the starter 16 when the engine is started is not mentioned, but a delay time corresponding to the increase in fuel pressure when the starter 16 is driven may be set.

[0089] The following reference figure 1 as well as Figure 7 with Figure 8 The second embodiment of the present invention in which the starter 16 is controlled with a delay in starting will be described.

[0090] As described above, the starter 16 has a structure that can be directly turned on / off (ON / OFF) by the ECU 17.

[0091] Figure 7 and Figure 8 It is a block diagram and a time chart of the starter control process at the time of engine start in the second embodiment of the present invention.

[0092] in Figure 8 Here, the predetermined delay time TD from when the ignition switch is turned on (ON) to when the starter 16 is turned on (ON) is set to the time until the fuel pressure is sufficiently increased.

[0093] in Figure 7 At first, ECU17...

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Abstract

There can be obtained a fuel injection control device for an internal combustion engine capable of reliably preventing fuel from leaking from an injection nozzle while the engine is stopped. Contains various sensors (5), (6), (14), (15) for detecting operating conditions, fuel pump (24) and fuel piping (22) for supplying fuel in the fuel tank (23), and nozzles for injecting fuel (8) An engine stop detecting device (17) for detecting a stopped state of the internal combustion engine (1), a fuel temperature estimating device (17) for estimating a fuel temperature, a fuel pressure reducing device (17) for reducing a fuel pressure, the fuel pressure reducing device is After the internal combustion engine stops, the fuel pressure in the fuel pipe (22) is reduced according to the fuel temperature estimation value of the fuel temperature estimation device.

Description

(1) Technical field [0001] The present invention relates to a fuel injection control device for an internal combustion engine that does not lead to an increase in cost and prevents fuel from leaking from a nozzle when the engine is stopped. (2) Background technology [0002] Generally, in an automobile engine, fuel from a fuel tank is supplied to the engine (internal combustion engine) through a fuel pump and a fuel pipe, and the fuel is injected into the engine through a nozzle. [0003] At this time, in order to improve the high-temperature restartability when the engine is started, it is necessary to prevent the generation of steam in the fuel in the fuel pipe. [0004] Therefore, in conventional fuel injection control devices for internal combustion engines, the structure adopted is to provide a check valve on the discharge side of the fuel pump so that the remaining fuel pressure in the fuel pipe does not decrease when the engine is stopped, so as to maintain high fuel. pres...

Claims

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Application Information

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IPC IPC(8): F02N11/08F02D41/04F02D41/30F02D45/00F02M37/00F02M55/02
CPCF02D41/042F02D41/3082F02D2041/225F02D2200/0602F02D2250/31
Inventor 榎木圭一东忠宏垣木健
Owner MITSUBISHI ELECTRIC CORP
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