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Method for determining engine crankshaft position

A crankshaft position and engine technology, applied in engine control, machine/engine, mechanical equipment, etc., can solve problems such as the inability to accurately determine the stop position of the crankshaft, the inability to accurately determine the crankshaft reversal and the angle of reversal, etc.

Active Publication Date: 2011-05-11
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In short, the existing technology cannot accurately determine whether the crankshaft is reversed and the angle of the reversed direction, nor can it accurately determine the stop position of the crankshaft

Method used

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  • Method for determining engine crankshaft position
  • Method for determining engine crankshaft position
  • Method for determining engine crankshaft position

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0034] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment of various embodiments of the present invention.

[0035] figure 1 It is each step of detecting the crankshaft position of the engine during the shutdown process of the present invention.

[0036] In step 1, input the most important judgment signal of this method: crankshaft position signal pulse and ignition switch state. In step 2, calculate the time interval of the crankshaft position signal pulse according to the falling edge, and calculate the engine speed. In step 3, it is determined whether the engine speed enters the critical shutdown condition. If the speed is less than 100 revolutions per minute, the output is yes, continue to step 4. If the speed is greater than or equal to 100 revolutions per minute, the output is no, go to step 6, enter the normal driving state, and do not perform reverse rotation detection.

[0037] In step 4, it is a...

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PUM

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Abstract

The invention relates to a method for detecting the position of an engine crankshaft. Under the condition of using an original non-directional crank position judgment sensor, on the basis that the concepts of engine friction torque and inner cylinder charging torque are introduced, and the variation tendency of the engine dynamic power is calculated; on the moment that all dynamic power are zero,the crankshaft inverse rotation position can be probably generated, and by checking the pulse interval of rotational speed signals before and after the probable inverse rotation point, whether the inverse rotation is generated or not and the concrete time of the inverse rotation are finally determined. The method can judge the switching number of the rotation direction of the crankshaft in the shutdown process to the utmost extent and can determine rotated angles in different rotation directions, so that the stop position of the engine crank is finally determined accurately.

Description

Technical field [0001] The invention relates to a method for detecting the position of an engine crankshaft, in particular to a method for predicting the position of the crankshaft during engine shutdown. Background technique [0002] Engine crankshaft position detection and signal synchronization are the basis of engine fuel injection and ignition control. Especially in the engine starting process, the earlier the engine controller determines the crankshaft position, the better the starting quality, and the lower the emissions during starting. The engine controller detects the signal triggered by the crankshaft position signal wheel through the engine crankshaft sensor, which constitutes the most basic signal logic basis for engine operation control. If the engine controller is able to switch off the ignition key after the ignition key is turned off, the engine The accurate position of the last running stop is memorized in the lossy memory, so that the engine controller can shor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/06
Inventor 周重光吴培周苏万樯
Owner CHERY AUTOMOBILE CO LTD
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