Rotational speed control method and device for idle speed of petrol engine and working condition of small accelerator

A gasoline engine, engine speed technology, applied in engine control, machine/engine, electrical control, etc., can solve problems such as cost increase

Inactive Publication Date: 2010-10-13
ZHEJIANG FAI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, adding an electronically controlled idle air valve will inevitably increase the cost, and the response speed of the idle air valve may not be able to meet the needs of rapid adjustment

Method used

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  • Rotational speed control method and device for idle speed of petrol engine and working condition of small accelerator
  • Rotational speed control method and device for idle speed of petrol engine and working condition of small accelerator
  • Rotational speed control method and device for idle speed of petrol engine and working condition of small accelerator

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Embodiment Construction

[0049] exist figure 1 In the shown engine system of implementing the present invention, include engine body 3, crankshaft 2, camshaft 5, throttle body 8, electric control unit (ECU) 12, ignition device 14, fuel injection device 7 and various sensors Wait. On the throttle body 8, there is a throttle plate 10 for adjusting the air intake of the engine. On the throttle plate 10, there is a non-adjustable main idle air intake hole 11, the size of which is determined according to the minimum air intake required for the stable idle speed of the engine. For example, for the motorcycle engine of 125-150cc displacement, the main idle air intake hole 11 can be designed as a circular hole of diameter 2-2.5mm; for the motorcycle engine of 50-110cc displacement, the main idle air intake hole 11 can be designed as A round hole with a diameter of 1.2-2.2mm. Of course, besides the idle air flow flowing in through the main idle air intake hole 11, a certain amount of idle air also flows thro...

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Abstract

The invention discloses a method and a device for controlling idle speed of a petrol engine and rotational speed of a small accelerator. The device comprises an engine body, an electric control unit (ECU), a fuel injection device, an ignition device, a restrictor body and the like. The device is characterized in that: the restrictor body has nonadjustable and large enough idle speed air inlet quantity at an idle speed position; the electric control unit controls the ignition device; and the idle speed or a preset target rotational speed reached by the rotational speed of the small acceleratoris fed back and controlled through great adjustment of an ignition advance angle. The method comprises the following steps of: 1) judging a compressed expansion process or an intake / exhaust process at present; 2) giving an ignition signal in the compressed expansion process, and avoiding giving the ignition signal in the intake / exhaust process; and 3) determining the ignition advance angle according to a difference between the current measured rotational speed of the engine and the target rotational speed and a basic ignition angle.

Description

technical field [0001] The invention relates to an electronically controlled spark ignition type internal combustion engine, in particular to a commonly used electronically controlled fuel injection and ignition four-stroke gasoline engine for automobiles and motorcycles. Background technique [0002] The spark-ignition internal combustion engine adopts electronically controlled ignition technology, which can freely adapt to different requirements of ignition advance angle (sometimes referred to as ignition angle) in various working conditions, in order to achieve high efficiency, energy saving, emission reduction and other effects. Especially for gasoline engines, the use of electronically controlled fuel injection and ignition can precisely control the combustion mixture air-fuel ratio of gasoline engines, thereby greatly improving various performances of gasoline engines, including engine start performance, idling performance, and running stability. , power, fuel consumpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D43/00
Inventor 杨延相张平刘昌文郗大光
Owner ZHEJIANG FAI ELECTRONICS
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