CN102252847A - Method for testing actuating phase of variable valve timing (VVT) mechanism of engine pedestal benchmarking test - Google Patents
Method for testing actuating phase of variable valve timing (VVT) mechanism of engine pedestal benchmarking test Download PDFInfo
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- CN102252847A CN102252847A CN2011101524068A CN201110152406A CN102252847A CN 102252847 A CN102252847 A CN 102252847A CN 2011101524068 A CN2011101524068 A CN 2011101524068A CN 201110152406 A CN201110152406 A CN 201110152406A CN 102252847 A CN102252847 A CN 102252847A
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Abstract
The invention relates to a method for testing actuating phase of a variable valve timing (VVT) mechanism of an engine pedestal benchmarking test. In the method, a signal of a crankshaft position sensor and a signal of a camshaft position sensor are acquired by an oscilloscope according to the position relationship between a VVT engine crankshaft and a camshaft; the waveform positions of both signals are displayed on the oscilloscope; and the waveform position of the crankshaft position sensor signal is not changed, so whether the VVT mechanism acts or not can be judged according to the relative position between the waveform of the camshaft position sensor signal and the waveform of the crankshaft position sensor signal. Equipment utilized in the test method is simple; the calculation method is simple and convenient; the test method is accurate in measurement; and the requirement of the engine pedestal benchmarking test on the actuating phase of the VVT mechanism can be met.
Description
Technical field
The invention belongs to the automotive test field, be specifically related to the method for testing of a kind of engine pedestal the vvt mechanism start phase place of mark test.
Background technology
Carrying out the VVT engine pedestal in the mark test, owing to can't obtain diagnostic equipment,, also do not having a kind of better method to judge so can't judge the whether phase place of start and start thereof of this type vvt mechanism to the mark type.
As mentioned above, there is not a kind of easy method that the start phase place of vvt mechanism is tested at present.
Summary of the invention
The subject matter that the present invention solves is at there not being a kind of easy method that engine pedestal is tested the start phase place of the vvt mechanism of mark type at present, design a kind of easy method of testing judge the engine vvt mechanism whether start with and the value of start phase place.
Above-mentioned technical matters of the present invention mainly solves by following technical proposals:
A kind of engine pedestal is to the method for testing of the VVT start phase place of mark test, and its step comprises:
A. the VVT engine is installed on the automotive engine test bench, engine is powered on, utilize multimeter to judge the signal wire of crankshaft position sensor and CMPS Camshaft Position Sensor;
B. signal wire is drawn and be connected on the oscillograph;
C. before the operation of VVT engine, pull out the Wiring harness terminal that drives engine vvt mechanism OCV valve;
D. pilot engine, make the engine idle operation, utilize the signal of oscillograph detecting sensor, on oscillograph, demonstrate the waveform of two kinds of sensor signals, gather one group of signal and determine position relation between the signal waveform, with this position relation as judge vvt mechanism whether the initial position of start concern;
E. engine shutdown inserts the Wiring harness terminal that drives engine vvt mechanism OCV valve, pilots engine once more, makes the engine idle operation, gathers one group of signal again, the position relation when determining engine idle once more between two waveforms;
F. whether change by the relative position relation between two signal waveforms relatively, judge the whether start of engine idling condition vvt mechanism;
G. other engine operation condition, only position relation and the initial position relation of the signal waveform of two sensors of need collection compares, can judge whether start of vvt mechanism, and by repeatedly measure the instant phase waveform of camshaft with respect to bent axle stationary phase waveform in advance or retardation time, calculate accurate phase place.
Its computing method are as follows:
Suppose that engine speed is
, shift to an earlier date or retardation time
, then:
Engine changeed for 1 circle time:
The phase angle of VVT start is:
The present invention is the position relation of utilizing between VVT engine crankshaft and the camshaft, utilize the signal of oscillograph while collecting crankshaft position transducer and the signal of CMPS Camshaft Position Sensor, on oscillograph, show the two waveform position, because the position of CRANK SENSOR waveform is constant, so can judge whether vvt mechanism moves by the relative position between CMPS Camshaft Position Sensor signal waveform and the CRANK SENSOR waveform.
The equipment that this method of testing is utilized is simple, and computing method are easy, measures accurately, satisfies engine pedestal to the demand of mark test to VVT start test.
Description of drawings
Fig. 1 is a synoptic diagram of the present invention:
Among the figure: 1-engine, the thin electric wire of 2-, the thin electric wire of 3-, 4-oscillograph.
Embodiment
Detect one to mark test with the whether start of the vvt mechanism of VVT engine, and measure its phase change situation, implementation step comprises:
A. the VVT engine is installed on the automotive engine test bench, engine is powered on, utilize multimeter to judge the signal wire of crankshaft position sensor and CMPS Camshaft Position Sensor;
B. signal wire is drawn, be connected on the oscillograph with the signal wire of thin electric wire 2 with the CMPS Camshaft Position Sensor on the engine 1; End with thin electric wire 3 is connected with engine body again, and other one of thin electric wire 3 terminates on the oscillograph, and thin electric wire 3 is equivalent to the ground wire of CMPS Camshaft Position Sensor signal wire;
C. before the operation of VVT engine, pull out the Wiring harness terminal that drives engine vvt mechanism OCV valve;
D. pilot engine, make the engine idle operation, utilize the signal of oscillograph detecting sensor, on oscillograph, should demonstrate the waveform of two kinds of sensor signals, gather one group of signal and determine position relation between the signal, with this position relation as judge vvt mechanism whether the initial position of start concern;
E. engine shutdown inserts the Wiring harness terminal that drives engine vvt mechanism OCV valve, pilots engine once more, makes the engine idle operation, gathers one group of signal again, the position relation when determining engine idle once more between two waveforms;
F. by the relation of the position between the binary signal, judge the whether start of engine idling condition vvt mechanism;
Other engine operation condition, only position relation and the initial position relation of the signal waveform of two sensors of need collection compares, can judge whether start of vvt mechanism, and by repeatedly measuring the instant phase waveform of camshaft shifting to an earlier date or retardation time with respect to bent axle stationary phase waveform, and, calculate accurate phase place by simple calculating.
Claims (2)
1. an engine pedestal is to marking the method for testing of the VVT start phase place of testing, and its characterization step comprises:
The VVT engine is installed on the automotive engine test bench, engine is powered on, utilize multimeter to judge the signal wire of crankshaft position sensor and CMPS Camshaft Position Sensor;
Signal wire drawn be connected on the oscillograph;
Before the operation of VVT engine, pull out the Wiring harness terminal that drives engine vvt mechanism OCV valve;
Pilot engine, make the engine idle operation, utilize oscillograph to detect the signal of crankshaft position sensor and CMPS Camshaft Position Sensor, on oscillograph, should demonstrate the waveform of sensor signal, gather one group of signal and determine position relation between the signal waveform, with this position relation as judge vvt mechanism whether the initial position of start concern;
Engine shutdown inserts the Wiring harness terminal that drives engine vvt mechanism OCV valve, pilots engine once more, makes the engine idle operation, gathers one group of signal again, the position relation when determining engine idle once more between two signal waveforms;
Whether change by the relative position relation between two signal waveforms relatively, judge the whether start of engine idling condition vvt mechanism;
Other engine operation condition, only position relation and the initial position relation of the signal waveform of two sensors of need collection compares, can judge whether start of vvt mechanism, and by repeatedly measure the instant phase waveform of camshaft with respect to bent axle stationary phase waveform in advance or retardation time, calculate accurate phase place.
2. engine pedestal according to claim 1 is characterized in that to the method for testing of the VVT start phase place of mark test described computing method are as follows:
Suppose that engine speed is
, shift to an earlier date or retardation time
, then:
Engine changeed for 1 circle time:
The phase angle of VVT start is:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101524068A CN102252847A (en) | 2011-06-08 | 2011-06-08 | Method for testing actuating phase of variable valve timing (VVT) mechanism of engine pedestal benchmarking test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101524068A CN102252847A (en) | 2011-06-08 | 2011-06-08 | Method for testing actuating phase of variable valve timing (VVT) mechanism of engine pedestal benchmarking test |
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| CN2011101524068A Pending CN102252847A (en) | 2011-06-08 | 2011-06-08 | Method for testing actuating phase of variable valve timing (VVT) mechanism of engine pedestal benchmarking test |
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Cited By (5)
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|---|---|---|---|---|
| CN102519728A (en) * | 2011-12-28 | 2012-06-27 | 哈尔滨东安汽车动力股份有限公司 | Function test device and method of engine variable valve timing (VVT) system |
| CN105043432A (en) * | 2015-08-18 | 2015-11-11 | 安徽日正新源电气技术有限公司 | Method for detecting camshaft phase sensor |
| CN105525958A (en) * | 2015-12-09 | 2016-04-27 | 奇瑞汽车股份有限公司 | Detecting method and control method of VVT systems of engine |
| CN105888842A (en) * | 2016-04-08 | 2016-08-24 | 裴毅强 | Hydraulic VVT angle dynamic measuring method of vehicle engine |
| CN108663217A (en) * | 2018-03-28 | 2018-10-16 | 中汽研（天津）汽车工程研究院有限公司 | A kind of engine pedestal based on vehicle dry run is to marking method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519728A (en) * | 2011-12-28 | 2012-06-27 | 哈尔滨东安汽车动力股份有限公司 | Function test device and method of engine variable valve timing (VVT) system |
| CN105043432A (en) * | 2015-08-18 | 2015-11-11 | 安徽日正新源电气技术有限公司 | Method for detecting camshaft phase sensor |
| CN105525958A (en) * | 2015-12-09 | 2016-04-27 | 奇瑞汽车股份有限公司 | Detecting method and control method of VVT systems of engine |
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| CN105888842A (en) * | 2016-04-08 | 2016-08-24 | 裴毅强 | Hydraulic VVT angle dynamic measuring method of vehicle engine |
| CN108663217A (en) * | 2018-03-28 | 2018-10-16 | 中汽研（天津）汽车工程研究院有限公司 | A kind of engine pedestal based on vehicle dry run is to marking method |
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Application publication date: 20111123 |