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Method and device for starting an electronically controlled multi-cylinder engine

A multi-cylinder engine, engine technology, applied in the direction of engine control, machine/engine, electrical control, etc., to avoid multiple fuel injections, reduce the possibility of phase misjudgment, and reduce the impact of emissions

Active Publication Date: 2015-12-23
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this "single-cylinder acceleration threshold" method may lead to misjudgment, that is, the phase of the engine is in the correct phase, but the value of the single-cylinder acceleration is less than the preset threshold, especially in the case of cold start. The chance of misjudgment will increase

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  • Method and device for starting an electronically controlled multi-cylinder engine
  • Method and device for starting an electronically controlled multi-cylinder engine
  • Method and device for starting an electronically controlled multi-cylinder engine

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Embodiment 1

[0035] see figure 1 , which shows the flow of an embodiment of the method for starting an electronically controlled multi-cylinder engine of the present application. This embodiment (embodiment one) comprises:

[0036] Step S101: Obtain the first phase of the engine through the crankshaft sensor when the signal provided by the camshaft sensor is not obtained;

[0037] As mentioned above, under normal circumstances, the signal provided by the camshaft sensor and the signal provided by the crankshaft sensor are necessary to determine the current phase of the engine, but under the influence of some factors, it may not be possible to obtain the signal of the cam sensor normally , these factors may be that the signal cannot be collected due to the failure of the camshaft sensor itself, or it may be that the signal collected by the camshaft sensor is lost during the transmission process, or it may be that the signal collected by the camshaft sensor has not been transmitted due to t...

Embodiment 2

[0043] The above-mentioned embodiment has described in detail the method of determining the phase of the engine by using the "results of judging cylinders when parking". Although this method can determine the phase more accurately and reduce misjudgment of the phase, in the actual application process, the engine phase information is still related to the engine phase. These factors may cause the phase determined by the above method to be not 100% correct, especially in the case of cold start, because the speed is low and fluctuates greatly during cold start, it is more likely to cause the phase to be determined incorrectly. phase deviation. In order to further improve the accuracy of determining the phase, the present application also considers combining the methods of the above embodiments with the "single-cylinder acceleration threshold method", so that, compared with only using the "single-cylinder acceleration threshold method", the The current engine phase can be determine...

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Abstract

The invention discloses a method and a device for staring an electronic control multi-cylinder engine. The method for starting the electronic control multi-cylinder engine includes the following steps: obtaining a first phase of the engine through a crankshaft sensor when signals provided by a camshaft sensor are not obtained, matching the first phase up with a second phase of the engine when the engine stops working at the last time stored by an electronic control unit (ECU), determining a current phase of the engine according to the first phase or the second phase if the first phase is matched with the second phase, and starting the engine according to the current phase of the engine. The invention further discloses a device for starting the electronic control multi-cylinder engine. According to the method and the device for starting the electronic control multi-cylinder engine, the phases can be more accurately determined, and engine start efficiency is increased.

Description

technical field [0001] The present application relates to the technical field of engines, in particular to an electronically controlled multi-cylinder engine starting method and a corresponding device. Background technique [0002] When starting an electronically controlled multi-cylinder engine, information such as fuel injection advance angle and cylinder number is needed. In order to obtain this information, the current phase of the engine is usually identified through the signal of the crankshaft sensor and the signal of the camshaft sensor. However, when the camshaft sensor fails or the acquired signal is lost, since only the signal provided by the crankshaft sensor remains, only the phase of the engine at 0° to 360° (or 360° to 720°) can be determined based on the signal Information, that is, when a cylinder of an electronically controlled multi-cylinder engine is at top dead center, it cannot be determined whether the top dead center is compression top dead center or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/06F02D41/30
Inventor 李大明史家涛孙潇艾聪张国磊
Owner WEICHAI POWER CO LTD
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