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A method and device for starting an electronically controlled diesel engine without a camshaft signal

A diesel engine and camshaft technology, applied in the field of starting methods and devices for electronically controlled diesel engines without camshaft signals, can solve the problems of wasting time, high error rate of fuel injection judgment, prolonging the starting time of diesel engines, etc., and achieve the goal of improving accuracy Effect

Active Publication Date: 2015-10-07
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the test fuel injection test, there will be many misfires due to low temperature or other reasons, so that the cylinder acceleration is detected to be lower than the threshold, but the reason is not caused by the wrong judgment of the crankshaft angle, so it is often caused by misjudgments. The phase of the crankshaft is reversed, and the judgment error rate of the fuel injection test is high. Multiple wrong judgments waste time and prolong the start-up time of the diesel engine.

Method used

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  • A method and device for starting an electronically controlled diesel engine without a camshaft signal
  • A method and device for starting an electronically controlled diesel engine without a camshaft signal
  • A method and device for starting an electronically controlled diesel engine without a camshaft signal

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Embodiment 1

[0054] see figure 1, which is a flowchart of a method for starting an electronically controlled diesel engine without a camshaft signal disclosed in Embodiment 1 of the present invention, including the following steps:

[0055] Step 101: Continuously perform test injections on multiple test cylinders according to the preset number of test injections;

[0056] Wherein, the preset number of test injections is at least three times and less than the number of injections in one working cycle;

[0057] Step 102: Calculate the acceleration of the test cylinder after each test injection;

[0058] Preferably, step 102 includes: step A and step B,

[0059] Step A: Obtain the sum of the tooth periods of the crankshaft teeth corresponding to the test cylinder after each test injection;

[0060] Step B: sequentially calculate the ratio of the sum of the crankshaft tooth periods of the previous test cylinder and the sum of the crankshaft tooth periods of the latter test cylinder among th...

Embodiment 2

[0072] The method proposed in the above-mentioned embodiment may cause a misjudgment of the acceleration of the horizontal bar due to engine vibration or other reasons, and then lead to a misjudgment of the phase. In this case, direct fuel injection will cause a lot of waste of fuel. To solve the above technical problems, the present invention also provides another method for starting an electronically controlled diesel engine without a camshaft signal, such as figure 2 The schematic diagram of the method shown, specifically includes:

[0073] Step 201: Continuously perform test injections on multiple test cylinders according to the preset number of test injections;

[0074] Wherein, the preset number of test injections is at least three times and less than the number of injections in one working cycle;

[0075] Step 202: Calculate the acceleration of the test cylinder after each test injection;

[0076] Preferably, step 202 includes: step A and step B

[0077] Step A: Obt...

Embodiment 3

[0093] In order to better protect the hardware equipment of the engine and reduce equipment loss, the present invention also provides another method for starting an electronically controlled diesel engine without a camshaft signal, specifically as image 3 Shown include:

[0094] Step 301: Judging whether the current total number of test injections has reached the maximum number of test injections allowed for one startup, if so, stop the test injection, otherwise, perform the test injection processing step 302.

[0095] Step 302: Continuously perform test fuel injection on multiple test cylinders according to the preset test fuel injection times;

[0096] Step 303: Calculate the acceleration of the test cylinder after each test injection, wherein the preset number of test injections is at least three times and less than the number of injections in one working cycle;

[0097] Step 304: comparing the acceleration of the test cylinder after each test injection with the normal ac...

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Abstract

The invention discloses an electric control diesel engine starting method and an electric control diesel engine starting device without camshaft signals. The electric control diesel engine starting method includes steps of continuously tentatively spraying oil to multiple test cylinders according to preset tentative oil spraying times, and calculating acceleration speed of the test cylinders after each time of tentative oil spraying; comparing the acceleration speed of the test cylinders with normal acceleration speed threshold value after each time of tentative oil spraying; counting the times that the acceleration speed of the test cylinders is larger than the normal acceleration speed threshold value; judging whether the counted times is larger than one second of the preset tentative oil spraying times; if not, respraying oil tentatively after reversing current phase of a crankshaft; and if yes, spraying oil on the test cylinders sequentially according to the oil spraying sequence of the test cylinders. By the electric control diesel engine starting method and the electric control diesel engine starting device, judgment error rate can be decreased, and accordingly, diesel engine starting speed is increased.

Description

technical field [0001] The invention relates to the mechanical field, in particular to a method and device for starting an electronically controlled diesel engine without a camshaft signal. Background technique [0002] When the diesel engine is started, it is determined which cylinder should be injected according to the current phase relationship between the crankshaft and the camshaft and the injection sequence of the cylinders. If it cannot be determined which cylinder should be injected currently, the diesel engine cannot be started. In one working cycle, the camshaft rotates one revolution for every two revolutions of the crankshaft. The fuel injection sequence is thus. For example: in practical applications, a four-stroke six-cylinder diesel engine is used, and the fuel injection sequence of the six cylinders is 153624. In one working cycle, when the camshaft rotates the first half circle, the crankshaft rotates to 120 degrees, 240 degrees and At 360 degrees, oil shou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D11/10F02M65/00
Inventor 史家涛孙潇卫文晋陈娜娜王飞飞
Owner WEICHAI POWER CO LTD