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Idle speed control device

A control device and idle speed technology, applied in electrical control, engine control, fuel injection control, etc., can solve problems such as slow decrement speed

Active Publication Date: 2005-04-06
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, when the difference between the intake air amount calculated in the feedback control and the intake air amount calculated in the open loop control is large, even if the decrement speed of the intake air amount is slow when moving, there are cases where the engine speed cannot be adjusted from the feedback. Possibility of smooth transition from idle state of control to off-idle state of open loop control

Method used

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  • Idle speed control device
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Examples

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Embodiment Construction

[0024] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. figure 1 It is a block diagram showing the configuration of main parts of a vehicle equipped with the idling rotation speed control device of the present invention, and only the configuration necessary for the description of the present invention is shown here, and the illustration of other configurations is omitted.

[0025] A throttle valve 3 is provided on an intake pipe 2 of the engine 1 . The opening degree (throttle opening) θth of the throttle valve 3 is detected by a throttle opening sensor 4 and notified to an engine control unit (ECU) 5 . A bypass passage 6 bypassing the throttle valve 3 is further connected to the intake pipe 2, and an idle control valve (IACV) 7 for controlling the amount of air sucked in during idling is provided in the middle of the bypass passage 6.

[0026] The above-mentioned IACV 7 includes a pulse moto...

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Abstract

Engine-rotation-speed-controlling state can be smoothly transferred from feedback-controlled idle state to open-loop-controlled non-idle state. This invention comprises means (55) for determining whether an engine (1) is in an idle state or a non-idle state; a feedback control unit (56) for controlling an idle control valve (7) in the idle state to make the engine rotation speed (Ne) identical to a target rotation speed (ne); a valve-opening-level-holding unit (58) for maintaining the idle control valve (7) at the opening level of feedback control in the transition from the idle state to the non-idle state until throttle opening level reaches a threshold opening level theta ref2; and an open-loop control unit (57) that controls the opening level of the idle control valve (7) to the target valve opening level theta open in the non-idle state, when the throttle opening level reaches to the threshold opening level theta ref2.

Description

technical field [0001] The invention relates to an idle speed control device for controlling the engine speed in an idle state to a target value, in particular to an idle speed control device for selecting feedback control in an idle state and open-loop control in a non-idle state. Background technique [0002] In Patent Document 1 and Patent Document 2, an idle speed control device is disclosed. In order to control the engine speed in the idling state to a target value, the idle speed control device is provided with a throttle valve connected to the intake pipe. A bypass passage and an idle control valve (idle air control valve: IACV) that controls the opening of the bypass passage, and adjusts the IACV according to engine parameters such as engine cooling water temperature and engine speed. [0003] In Patent Document 2, in order to control the valve opening of the IACV to an appropriate value, feedback control is employed in the idling state, and open-loop control is empl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D9/02F02D31/00F02D41/08F02D41/14F02D41/16F02D45/00
CPCF02D31/005F02D41/08F02D2200/0404F02D41/16F02D41/1488
Inventor 露口诚
Owner HONDA MOTOR CO LTD
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