CN109297399A - Correct timing angle measurer, method and system - Google Patents
Correct timing angle measurer, method and system Download PDFInfo
- Publication number
- CN109297399A CN109297399A CN201811141194.1A CN201811141194A CN109297399A CN 109297399 A CN109297399 A CN 109297399A CN 201811141194 A CN201811141194 A CN 201811141194A CN 109297399 A CN109297399 A CN 109297399A
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- Prior art keywords
- engine
- timing
- angle
- measuring device
- cam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
Abstract
A kind of correct timing angle measurer, method and system, the engine cam correct timing angle measurer, comprising: rotation axis and the second dip measuring device, in which: the first end and engine cam axis connection of the rotation axis；Second dip measuring device, is fixed on the second end of the rotation axis, for measuring engine cam timing angle.Above scheme can be improved the measurement accuracy of engine timing angular deviation.
Description
Technical field
The present embodiments relate to technical field of engines more particularly to a kind of correct timing angle measurer, method and it is
System.
Background technique
" light-duty vehicle pollutant emission limit and measurement method (Chinese 6th stage) " standard, may be simply referred to as " state six ",
" light-duty vehicle pollutant emission limit and measurement method (Chinese 5th stage) " standard, may be simply referred to as " state five "." state six " is
Upgrading to " state five " standard, compared with " state five " standard, " state six " is stringenter to the discharge limitation of Automobile emission, is arranging
In the case where influencing except operating condition and test, the CO emission of gasoline car reduces by 50%, total hydrocarbon and non-methane
Total hydrocarbon emissions limitation decline 50%, discharged nitrous oxides limitation plus tight 42%, and will be in formal real stage by stage in following several years
Row.
As increasingly stringent vehicular emission demand and country put into effect energy-saving and emission-reduction correlation method policy, major automobile
Manufacturer is increasingly stringenter the accurate control of timing system, and the matching requirements of engine timing system are also increasingly stringenter,
The detection accuracy of timing position after assembly is required also higher and higher.
Engine timing system is mainly sent out by the camshaft Hall sensor of acquisition intake and exhaust cam shaft position signal, confirmation
The crankshaft position sensor of one cylinder top dead centre of motivation (Top Dead Center) forms.Engine timing system is mainly used for firing
Oil spurts control, ignition time control, variable valve timing technology (Variable Valve Timing, VVT) etc..
Currently, generalling use mechanical timing fixture or mechanical timing pointer angle measurement tool to detect engine just
When position.
However, detecting engine timing position using mechanical timing fixture, precision is poor, can not quantify to record positive hour angle
Spend deviation.Some improved mechanical timing fixtures are under the cooperation of supplemental measurement tool, although can measure and visually read
Angular deviation is taken, precision is still poor and cumbersome.Start using measured by mechanical timing pointer angle measurement tool
Machine timing angle deviation precision is also poor.
The permitted timing angle deviation of the engine of different model is different, and usual engine timing angular deviation is smaller more
It is good, especially in the case where discharge limitation of " state six " standard to Automobile emission is more stringent, once engine timing position
It sets and deviates or precision is inadequate, it will influence economy, dynamic property, comfort and the pollutant emission of vehicle.
Summary of the invention
Present invention solves the technical problem that being how to improve the measurement accuracy of engine timing angular deviation.
In order to solve the above technical problems, the embodiment of the present invention provides a kind of engine cam correct timing angle measurer,
It include: rotation axis and the second dip measuring device, in which: the first end and engine cam axis connection of the rotation axis；It is described
Second dip measuring device is fixed on the second end of the rotation axis, for measuring engine cam timing angle.
Optionally, the engine cam correct timing angle measurer further include: fixed hub is sheathed on the rotation
Axis.
Optionally, the fixed hub is provided with shotpin hole, is provided in the rotation axis and shotpin hole cooperation
Shotpin slot.
Optionally, the engine cam correct timing angle measurer further include: rotation axis axle sleeve and regulating arm are adjusted,
Wherein: the adjusting rotation axis axle sleeve is sheathed on the rotation axis；The regulating arm is removable with the adjusting rotation axis axle sleeve
Connection is unloaded, suitable for rotating the adjusting rotation axis axle sleeve to adjust engine cam angle.
Optionally, the engine cam correct timing angle measurer further include: camshaft sliding support is sheathed on institute
State rotation axis.
Optionally, the engine cam is Dual Over Head Camshaft, comprising: admission cam shaft and exhaust cam shaft.
Optionally, the rotation axis includes: admission cam shaft rotation axis, the first end of the admission cam shaft rotation axis with
Admission cam axis connection；Exhaust cam shaft rotation axis, the first end and exhaust cam axis connection of the exhaust cam shaft rotation axis.
Optionally, the camshaft sliding support, comprising: admission cam shaft sliding support and exhaust cam shaft sliding branch
Frame, in which: the admission cam shaft sliding support is sheathed on the admission cam shaft rotation axis, and with the exhaust cam shaft
Sliding support clamping；The exhaust cam shaft sliding support is sheathed on the exhaust cam shaft rotation axis.
Optionally, one of them of the admission cam shaft sliding support and the exhaust cam shaft sliding support, which are equipped with, connects
Socket part, another is equipped with the receiving hole for accommodating the interconnecting piece.
Optionally, the second end of the rotation axis is equipped with groove, and the bottom of the groove is plane and the excessively described rotation axis
Axle center, second dip measuring device are fixed in the groove.
Optionally, second dip measuring device is capacitance acceleration transducer.
The embodiment of the present invention also provides a kind of engine timing angle measurement system, comprising: any of the above-described engine is convex
Wheel shaft correct timing angle measurer and engine crankshaft correct timing angle measurer, in which: the engine crankshaft timing measurement
Device, comprising: spindle housing is provided with cylinder body base position location hole and crank reference position location hole；Fixed part, one end and hair
Motivation crankshaft is fixedly connected, and the other end is connect with the spindle housing, and can be rotated relative to the spindle housing；First inclination angle measurement dress
It sets, is fixed on the spindle housing, for passing through cylinder body base position location hole and the crank reference position location hole
After determining one cylinder top dead centre of engine, engine crankshaft timing angle is measured.
Optionally, the engine crankshaft timing measuring device, further includes: cylinder body base position adaptation pin, with the cylinder
Body base position location hole matches；Crank reference position adaptation pin, matches with the crank reference position location hole.
Optionally, the engine crankshaft timing measuring device, further includes: signal wheel location hole is set to the shaft
On frame.
Optionally, the signal wheel location hole is located at cylinder body base position location hole and the crank reference position is fixed
Between the hole of position.
Optionally, the fixed part is equipped with protrusion, and the spindle housing is equipped with groove, and the groove is described for accommodating
Protrusion.
Optionally, it is provided with receiving portion in the spindle housing, for placing first dip measuring device.
The embodiment of the present invention also provides a kind of engine timing angle measurement method, comprising: determines on one cylinder of engine only
Site；The absolute position of engine cam is obtained using any of the above-described engine cam correct timing angle measurer；Root
According to acquired engine cam absolute position and the absolute position of the engine crankshaft, engine timing angle is calculated
Degree.
Optionally, described that the absolute of engine cam is obtained using the engine cam correct timing angle measurer
Position, comprising: obtain the engine cam timing deviation angle from second dip measuring device；It is inclined according to engine
Difference, camshaft degree, the second dip measuring device installation deviation and the engine cam timing deviation angle obtain institute
State camshaft absolute position.
Optionally, when the engine cam is Dual Over Head Camshaft, the absolute position of the acquisition engine cam
It sets, comprising: third dip measuring device and the measurement of the 4th inclination angle are separately installed on admission cam shaft and exhaust cam shaft
Device obtains admission cam shaft timing deviation angle from the third dip measuring device, measures and fills from the 4th inclination angle
It sets and obtains exhaust cam shaft timing deviation angle；It is inclined according to engine deviation, camshaft degree, the installation of third dip measuring device
Difference and the admission cam shaft timing deviation angle obtain the admission cam shaft absolute position；According to engine deviation, convex
Wheel Shaft angle, the 4th dip measuring device installation deviation and the admission cam shaft timing deviation angle obtain the exhaust
Camshaft absolute position.
Optionally, the one cylinder top dead centre of determining engine, comprising: install engine crankshaft correct timing angle measurer
In engine crankshaft, wherein the engine crankshaft correct timing angle measurer includes: spindle housing, fixed part and the first inclination angle
Measuring device, in which: the spindle housing is provided with cylinder body base position location hole and crank reference position location hole；Described turn
Pedestal is provided with cylinder body base position location hole and crank reference position location hole；The fixed part, one end and the engine
Crankshaft is fixedly connected, and the other end is connect with the spindle housing, and can be rotated relative to the spindle housing；The first inclination angle measurement dress
It sets, is fixed on the spindle housing, for measuring the engine crankshaft timing angle；Using abswolute level line as zero-deviation position
It sets, by crankshaft machinery timing position positioning datum position, rotates the spindle housing to first position, using cylinder body benchmark position
It sets location hole and determines engine timing base position, read the first angle that first dip measuring device is shown；Rotation institute
Spindle housing is stated to the second position, crankshaft timing base position is determined using the crank reference position location hole, reads described the
The second angle that one dip measuring device is shown；According to the first angle and second angle, one cylinder top dead centre of engine is determined
Position.
Optionally, first dip measuring device, second dip measuring device, the third dip measuring device
And the 4th dip measuring device is capacitance acceleration transducer.
Optionally, the engine cam absolute position according to acquired in and the absolute position of the engine crankshaft
It sets, obtains engine timing angle, comprising: engine timing angular deviation α: F=ma is calculated using following formula；C=
ε·S/x；F=kx；Sin α=Ax/g, cos α=Ay/g； Wherein, Ax is measured value of the acceleration in x-axis direction, and Ay is survey of the acceleration in y-axis direction
Magnitude, Az are measured value of the acceleration in z-axis direction, and charge between C electrode, k is stiffness factor, and m is mass block quality, and x is position
Moving F=Ax is projection in the x direction, and g is acceleration of gravity, and G is gravity, and α is engine timing angular deviation.
Optionally, engine timing angle measurement method further include: the spindle housing is turned into signal wheel base position,
Obtain the angular deviation between the relative signal wheel of engine crankshaft timing position.
Compared with prior art, the technical solution of the embodiment of the present invention has the advantages that
By rotation axis and engine cam axis connection, the second dip measuring device by being fixed on rotation axis second end can
Directly to measure the timing angle of engine cam, relatively existing artificial estimation misalignment angle, using the embodiment of the present invention
The accuracy for the engine cam timing angle that the engine cam correct timing angle measurer measurement of offer obtains is higher,
So as to improve the measurement accuracy of engine timing angular deviation.
Further, according in spindle housing cylinder body base position location hole and crank reference position location hole to engine song
Axis correct timing angle measurer measure before correction, and using the first dip measuring device measure the positive hour angle of engine crankshaft
Degree, signal and camshaft signal without the output of collecting crankshaft signal wheel determine the deviation of timing system, need not also carry out
Artificial estimation, therefore can be further improved the measurement accuracy of engine timing angular deviation.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of engine cam correct timing angle measurer in the embodiment of the present invention；
Fig. 2 is a kind of cross-sectional view of engine cam correct timing angle measurer in the embodiment of the present invention；
Fig. 3 is a kind of explosive view of engine cam correct timing angle measurer in the embodiment of the present invention；
Fig. 4 is that a kind of engine cam correct timing angle measurer and engine cam cooperate in the embodiment of the present invention
Schematic diagram；
Fig. 5 is the structural schematic diagram of camshaft timing calibrating block；
Fig. 6 is a kind of structural schematic diagram of engine crankshaft correct timing angle measurer in the embodiment of the present invention；
Fig. 7 is cross-sectional view of the Fig. 6 on the direction A-A；
Fig. 8 is a kind of explosive view of engine crankshaft correct timing angle measurer in the embodiment of the present invention；
Fig. 9 is a kind of flow chart of engine timing angle measurement method in the embodiment of the present invention；
Figure 10 is camshaft timing position view when admission cam shaft has deviation；
Figure 11 is camshaft timing position view when exhaust cam shaft has deviation；
Figure 12 is engine crankshaft and crankshaft timing measuring instrument positional diagram in top dead centre；
Figure 13~Figure 16 is timing position view when engine is under different conditions；
Figure 17 is a kind of structural schematic diagram of capacitance acceleration transducer in the embodiment of the present invention；
Figure 18 is capacitance acceleration transducer working principle diagram；
Figure 19 is three axial rake stress decomposition principle figures.
Specific embodiment
The measurement accuracy of the measured deviation of the timing angle of engine timing system is low mainly by following both sides reason
It is caused: one, the assembling deviation of engine equipment of itself；Two, the measured deviation of measuring tool.
One, the assembling deviation of engine equipment of itself
The signal wheel that the engine cam of some models uses is the metal works with being tightened from axis hole twisted flower, Yi Cun
With camshaft angle assembling deviation.
The acquisition of the engine crankshaft rotating speed signal of some models needs total member by other and crankshaft cooperation.Crankshaft
The mechanical location and Rear oil seal flange assembly of timing are there is assembling deviation, and there is also dresses with signal gear ring for Rear oil seal flange assembly
With deviation.Only in the signal for guaranteeing Rear oil seal flange assembly with measuring in the correct situation in crankshaft machinery timing position
It is only correctly.However, assembly Rear oil seal flange assembly, especially manual (manufacture experimently, reprocess) assembly Rear oil seal flange are total online
At when there are assembling deviations and machine tool machining accuracy and assembly method itself to cause a deviation, these deviations will accumulation superposition,
It is poor to influence engine timing angle-measurement accuracy, it is unable to satisfy timing assembly precision requirement.
Two, the measured deviation of measuring tool
Engine cold test equipment station volume is larger, flexibility is poor, different engine models need to be made matched
Adapter and related accessory.Engine price is expensive general all more than millions of RMB and the rigging up and debugging period
Long, maintenance cost height is suitable for assembly line batch production detection and uses.
Universal machine formula timing fixture is generally purely mechanic adjusting, it is necessary to after manual disk moves engine to a cylinder top dead centre,
Solid mechanical formula timing fixture again.Mechanical timing fixture is unable to measure timing angle deviation and quantifies to record, and precision is poor.This
Outside, mechanical timing fixture cannot achieve the measurement of static and dynamic engine timing angle deviation.
Some mechanical timing fixtures also need to cooperate some Mechanical measurement tools to measure or visual detection, equally
Necessary craft disk moves engine crankshaft to a cylinder top dead centre, and low precision, complicated operation and is unable to measure camshaft, crankshaft just
When angular deviation, cannot achieve dynamic engine timing angle deviation measurement.
Universal machine formula timing pointer angle measurement tool, it is necessary to which removal of engine ignition coil and spark plug are to find hair
One cylinder top dead center position of motivation, manual disk move engine crankshaft, are carved by the pointer of mechanical timing pointer angle measurement tool
Scale reads scale to determine a cylinder top dead centre.However, mechanical timing pointer angle measurement tool is being unable to measure camshaft just
When angular deviation, the corresponding camshaft timing angular deviation of crankshaft can not also be measured, and precision is poor.In addition, mechanical timing
Pointer angle measurement tool cannot achieve the measurement of dynamic engine timing angle deviation using complicated operation.
Oscilloscope method does comparison confirmation angle using oscillograph detection camshaft, CRANK SENSOR and theoretical value
Deviation is spent, however, this correction measure must be based on complete engine system, while must break line measurement, influences to start
The integrality and safety of machine.In addition, the instrument can not be used as repairing tool of automobile.
Engine timing labelling method, when engine timing system (is manufactured experimently, reprocessed) in assembly, it is necessary in related components
It is identified or casts mark visual detection, since label mismachining tolerance, artificial visually error, timing chain (Timing Belt) are long
The presence of tolerance is spent, so that deviation is larger between part and part in engine timing system assembling process, while error is cumulative,
And then directly affect engine overall structure stability and precision.The tool must manual disk move on engine crankshaft a to cylinder
Stop, complicated operation and is unable to measure camshaft, crankshaft timing angle deviation.
In embodiments of the present invention, by rotation axis and engine cam axis connection, by being fixed on rotation axis second end
Second dip measuring device can directly measure the timing angle of engine cam, the relatively existing artificial estimation angle of deviation
Degree, the engine cam obtained using engine cam correct timing angle measurer measurement provided in an embodiment of the present invention is just
When angle accuracy it is higher, so as to improve the measurement accuracy of engine timing angular deviation.
It is understandable to enable above-mentioned purpose of the invention, feature and beneficial effect to become apparent, with reference to the accompanying drawing to this
The specific embodiment of invention is described in detail.
The engine cam correct timing angle measurer may include rotation axis and the second dip measuring device.It is described
The first end and engine cam axis connection of rotation axis, the second end of the rotation axis are fixed with the second inclination angle measurement dress
It sets.Second dip measuring device is for measuring engine cam timing angle.
Using engine cam correct timing angle measurer provided in an embodiment of the present invention, by engine cam timing
Angle measurement unit is installed on engine cam, rotates the engine cam correct timing angle measurer, Ke Yicong
Reading angular is read on second dip measuring device, namely obtains the angle of engine cam.
In specific implementation, the engine cam correct timing angle measurer can also include: fixed hub.It is described
Fixed hub can be sheathed on the rotation axis, and the fixed hub can increase the stabilization of the rotation axis Yu cam axis connection
Property.It is provided with a waist hole, on the fixed hub so as to be adapted to different type engine and be adapted to different shape cylinder cap
Housing, realization freely adjusts in the Z-axis direction and stationary engine camshaft timing measuring device, is improving engine cam just
When measuring device versatility.
In specific implementation, the fixed hub is provided with shotpin hole, is provided in the rotation axis and the shotpin hole
The shotpin slot of cooperation.Fixed hub and rotation axis can be consolidated using shotpin hole and shotpin slot described in bolt-through
It is fixed.After determining engine timing using tradition machinery fixture, it can be determined and be started by the shotpin slot and shotpin hole
Machine pedestal deviation, and after determining engine base deviation, it is measured using the engine cam correct timing angle measurer
Engine cam timing angle.
In embodiments of the present invention, the engine cam correct timing angle measurer can also include: to adjust rotation
Axis axle sleeve and regulating arm.The adjusting rotation axis axle sleeve can be sheathed on the rotation axis.The regulating arm can be with the tune
Section rotation axis axle sleeve is detachably connected.The regulating arm spindle nose can be equipped with screw thread, can with adjust rotation axis axle sleeve on
Threaded hole cooperation can pass through the regulating arm when regulating arm and the adjusting rotation axis axle sleeve link together
The adjusting rotation axis axle sleeve is rotated to adjust engine cam angle.
In specific implementation, the engine cam correct timing angle measurer can also include: camshaft sliding branch
Frame is sheathed on the rotation axis.
In specific implementation, the engine cam correct timing angle measurer can also include: camshaft sliding branch
Frame is sheathed on the rotation axis.The camshaft sliding support can fix the engine cam timing angle measurement dress
It sets.
When the engine cam is Single Over Head Camshaft, the number of the rotation axis is 1, the fixed hub
It can be 1, the adjusting rotation axis axle sleeve and regulating arm are one.
Fig. 1 gives a kind of structural schematic diagram of engine cam correct timing angle measurer in the embodiment of the present invention,
Fig. 2 gives a kind of cross-sectional view of engine cam correct timing angle measurer, Fig. 3 in the embodiment of the present invention and gives this hair
A kind of disassembly diagram of engine cam correct timing angle measurer, Fig. 4 give one in the embodiment of the present invention in bright embodiment
Relative position schematic diagram when kind engine cam correct timing angle measurer and engine cam are installed.Below with reference to Fig. 1
~Fig. 4, when being Dual Over Head Camshaft to the engine cam, engine cam correct timing angle measurer carries out detailed
Explanation.
When the engine cam is Dual Over Head Camshaft, the rotation axis includes admission cam shaft and exhaust cam
Axis.Engine cam correct timing angle measurer includes: that admission cam shaft rotation axis 141 and the admission cam shaft rotate
The co-axially fixed air inlet fixed hub 151 of axis 141, air inlet adjustment rotation axis axle sleeve 161, the air inlet fixed hub 151 can be with
According to the type adaptation different shape cylinder cover enclosure of engine, realize that Z-direction freedom degree adjusts and fixes entire camshaft just
When angle measurement unit；It is equipped with regulating arm threaded hole in the outer circle of the air inlet adjustment rotation axis axle sleeve 161, it can be with regulating arm
171 cooperations, realize manual setting engine cam angle；Exhaust cam shaft rotation axis 142 is rotated with the exhaust cam shaft
The co-axially fixed exhaust fixed hub 152 of axis 142, exhaust adjust rotation axis axle sleeve 162, and the exhaust fixed hub 152 can be with
According to the type adaptation different shape cylinder cover enclosure of engine, realize that Z-direction freedom degree adjusts and fixes entire camshaft just
When angle measurement unit；It is equipped with regulating arm threaded hole in the outer circle that the exhaust adjusts rotation axis axle sleeve 162, it can be with regulating arm
172 cooperations, realize manual setting engine cam angle.
In specific implementation, it is provided with shotpin hole 1511 on the air inlet fixed hub 151, in the admission cam shaft
Shotpin slot 1411 is provided in rotation axis 141, the shotpin hole 1511 cooperates with the shotpin slot 1411, and the air inlet of stretching is convex
The relative position of wheel shaft rotation axis 141 adjustable the admission cam shaft rotation axis 141 and admission cam shaft.In the exhaust
It is provided with shotpin hole (not shown) on fixed hub 152, is provided with shotpin slot in the exhaust cam shaft rotation axis 142
1421, the shotpin hole and the shotpin slot 1421 cooperate, the adjustable row of the exhaust cam shaft rotation axis 142 of stretching
The relative position of gas cam axle axis 142 and exhaust cam shaft.
In specific implementation, when the engine cam is Dual Over Head Camshaft, the camshaft sliding support, packet
It includes: admission cam shaft sliding support 181 and exhaust cam shaft sliding support 182, in which: the admission cam shaft sliding support
181, it is sheathed on the admission cam shaft rotation axis 141, and be clamped with the exhaust cam shaft sliding support 182；The exhaust
Camshaft sliding support 182 is sheathed on the exhaust cam shaft rotation axis 142.
In specific implementation, the spacing between the admission cam shaft of the engine of different model and exhaust cam shaft is different.
For the versatility for improving engine timing angle measurement system, in an embodiment of the present invention, the admission cam shaft sliding branch
One of them of frame 181 and the exhaust cam shaft sliding support 182 are equipped with interconnecting piece 1811, another, which is equipped with, is used for collecting post
State the receiving hole 1821 of interconnecting piece.The length of the receiving hole 1821 is protruded by adjusting the interconnecting piece 1811, it is adjustable
Spacing between the admission cam shaft and the exhaust cam shaft, to realize that freedom degree in the X-axis direction is adjusted, with suitable
Answer the engine of different model.For example, being provided with interconnecting piece 1811, the exhaust on the admission cam shaft sliding support 181
Receiving hole 1821 is provided on camshaft sliding support.
In an embodiment of the present invention, the second end of the rotation axis is equipped with groove, the bottom of the groove be plane and
The rotation axis axle center is crossed, second dip measuring device is fixed in the groove.It can reduce engine timing in this way
The computation complexity of angle measurement system.
The embodiment of the present invention also provides a kind of engine timing angle measurement system, engine timing angle measurement system
System may include engine crankshaft correct timing angle measurer and engine cam correct timing angle measurer.The engine
The structure and workflow of camshaft timing angle measurement unit may refer to the hair that any of the above-described embodiment of the present invention provides
Description in motivation crankshaft timing angle measuring device.Below to the structure of the engine crankshaft correct timing angle measurer with
And workflow is illustrated.
Fig. 6 gives a kind of structural schematic diagram of engine crankshaft correct timing angle measurer, Fig. 7 in the embodiment of the present invention
It is cross-sectional view of the Fig. 6 on the direction A-A, Fig. 8 is a kind of engine crankshaft correct timing angle measurer in the embodiment of the present invention
Disassembly diagram.It is described in detail below with reference to structure of Fig. 6~Fig. 8 to engine crankshaft correct timing angle measurer.
In specific implementation, engine crankshaft correct timing angle measurer can be mounted on to crankshaft rear end, wherein crankshaft
Rear end refers to close to the one end in flywheel portion.The engine crankshaft correct timing angle measurer may include: spindle housing 12, fixed part
11 and first dip measuring device 13.The fixed part 11, one end is fixedly connected with engine crankshaft, the other end and the shaft
Frame 12 connects, and can rotate relative to the spindle housing 12.First dip measuring device 13 can be fixed on the spindle housing
12.Engine timing angle measurement unit can be fixed on by crankshaft rear end using bolt.For example, using bolt by the fixation
Portion 11 is fixed on crankshaft.
In an embodiment of the present invention, it can be set protrusion 111 on the fixed part 11, it can be in the spindle housing 12
It is arranged fluted, the groove is for accommodating described raised 111.After described raised 111 are connected together with the groove, institute
Protrusion 111 is stated when rotating in the groove, the spindle housing 12 is rotated relative to the fixed part 11.
In an embodiment of the present invention, receiving portion 128, the first inclination angle measurement dress can be equipped in the spindle housing 12
13 are set to be placed in described accommodation section 128.128 place plane of described accommodation section can the excessively described spindle housing 12 axle center, in this way
First dip measuring device 13 is placed in installation can reduce the complexity of the calculating in engine crankshaft timing angle measurement process
Degree.
In specific implementation, cylinder body base position location hole 121 and crankshaft benchmark can be set in the spindle housing 12
Position location hole 123.It can be determined by cylinder body base position location hole 121 and crank reference position location hole 123
One cylinder top dead centre of crankshaft.
It in an embodiment of the present invention, can be using the cylinder body benchmark position to match with cylinder body base position location hole 121
Adaptation pin 122 is set, and is adapted to pin 124 really with the crank reference position that the crank reference position location hole 123 matches
Determine the position of one cylinder top dead centre of crankshaft.
Specifically, after engine crankshaft correct timing angle measurer is fixed on crankshaft rear end, rotating shaft frame
12, when cylinder body base position location hole 121 is opposite with the processing positioning reference holes of engine cylinder body, cylinder body base position is fitted
Distribution 122 is inserted into the location hole of cylinder body base position, and is stayed for some time, and the first dip measuring device 13 obtains first at this time
Angle, this position are also the base position of crankshaft timing.Then, cylinder body base position positioning pin 122 is taken out, shaft is continued to rotate
Frame 12 is inserted into crank reference position when crank reference position location hole 123 is opposite with the third Unequal distance hole of crankshaft rear end
It is adapted to pin 124, and is stayed for some time, the first dip measuring device 13 obtains second angle at this time.It is positioned by position twice
Later, one cylinder top dead center position of crankshaft can be determined according to obtained first angle and second angle.
In an embodiment of the present invention, first dip measuring device 13 is capacitance acceleration transducer.Utilize electricity
Appearance formula acceleration transducer can effectively eliminate engine tilt angles error to the perception characteristics of G gravity direction.
Engine is being determined by cylinder body base position location hole 121 and the crank reference position location hole 123
After one cylinder top dead centre, the first dip measuring device 13 can measure engine crankshaft timing angle.
From the foregoing, it will be observed that according in spindle housing cylinder body base position location hole and crank reference position location hole to engine
Crankshaft timing angle measuring device measure before correction, and using the first dip measuring device measure engine crankshaft timing
Angle determines the deviation of timing system without the signal of collecting crankshaft signal wheel output, also need not manually be estimated, only be led to
Crossing the existing cylinder body base position location hole of engine and crank reference position location hole can be realized on one cylinder of engine only
The confirmation of point, therefore the measurement accuracy of engine timing angular deviation can be improved.
In specific implementation, the speed probe of some engines is mounted on Rear oil seal flange assembly, engine crankshaft
Tach signal acquisition is needed by another total member with crankshaft cooperation, and the mechanical location of crankshaft timing and rear sealing flange are total
At there is assembling deviations.Only under Rear oil seal flange assembly and the correct situation in crankshaft machinery timing position, measure
Signal just there is correctness, it is online to assemble Rear oil seal flange assembly, especially by hand (manufacture experimently, reprocess) assembly when there is assembly
Deviation and machine tool machining accuracy and assembly method itself, which cause a deviation, accumulates superposition, to be unable to satisfy engine timing dress
With required precision.
To solve the above problems, in embodiments of the present invention, engine crankshaft correct timing angle measurer can also include:
Signal wheel location hole 125 and signal wheel timing detection adaptation pin 126.The signal wheel location hole 125 is set to the spindle housing
On 12, the spindle housing 12 is rotated, by the signal wheel location hole 126 and the timing signal hole phase on rear sealing flange assembly
It is right, signal wheel timing is detected into adaptation pin 126 and is inserted into the timing signal hole on the rear sealing flange assembly, at this point, described
The angle that first dip measuring device 13 is measured is the angular deviation between crankshaft timing position and signal wheel, so as to
It obtains and the mechanical location of crankshaft timing is with rear sealing flange assembly that there is caused by assembling deviation or part itself defect
Angular deviation.
In specific implementation, the signal wheel location hole 125 can be located at cylinder body base position location hole 121 and institute
It states between crank reference position location hole 123.It is understood that the type due to engine is different, and correspondingly, the signal
Take turns the relative position of location hole 125, cylinder body base position location hole 121 and the crank reference position location hole 123
Difference, as long as matching with the position in hole corresponding on engine.
Using engine timing angle measurement system provided in an embodiment of the present invention in measurement engine timing angular deviation
When, it is disassembled without to the components in engine, crankshaft timing angle measuring device need to be only mounted on to crankshaft, and will
Camshaft timing angle measurement unit is installed on camshaft, by reading the first dip measuring device 13 it can be learnt that starting
Machine crankshaft timing angle, by the reading engine cam timing angle for reading the second dip measuring device.
The first dip measuring device 13 in engine timing angle measurement system provided in an embodiment of the present invention, second incline
Angle measuring device is respectively arranged on crankshaft and camshaft.First dip measuring device, the second dip measuring device can be with
Timing system rotate together, can realize static and dynamic measurement with collecting crankshaft and the angular turn signal of camshaft.When
When first dip measuring device and the second dip measuring device are capacitance acceleration transducer, passed using capacitance acceleration
Sensor can effectively eliminate engine tilts angular error for the perception characteristics of G gravity direction, realize that crankshaft and cam between centers are exhausted
Timing angle deviation conversion to position.Capacitance acceleration transducer integrated wireless data signal transmitter, cooperation terminal without
Line data signal receiver may be implemented wireless data transmission, and show respective value in terminal.
Engine timing angle measurement system provided in an embodiment of the present invention can quickly, accurately, effectively in crankshaft and convex
Wheel shaft any position measure engine timing misalignment angle, thus diagnose, analyse whether by engine component defect, assembly
Failure caused by reason, rack and complete vehicle test etc..Meanwhile the engine timing angle measurement system can in X, Y direction
To realize that freedom degree is adjusted to adapt to different type of machines, different types of engine flexible operation and timing angle static state, dynamic
Measurement can also carry out analysis monitoring to the data of acquisition, improve Engine Assembling Quality and can be used as to reprocess class and adjust and start
Machine timing tool uses.
In addition, detecting engine timing angle using engine timing angle measurement system provided in an embodiment of the present invention
When, measured without broken line, will not integrality to engine and safety impact.The engine timing angle measurement
The small volume of system, use process is flexibly convenient, facilitates mass production.In the engine timing angle measurement system
Crankshaft timing angle measuring device and camshaft timing angle measurement unit can also be used alone, respectively as crankshaft timing
Angle measurement tool and camshaft timing angle measurement tool.The engine timing angle measurement system can realize any position
The bidirectional measurement of crankshaft timing and camshaft timing is set, which refers to positive and negative 90 ° of (absolute values on the basis of a cylinder top dead centre
180 °) within any position.The engine timing angle measurement system can also be to engine rear flange assembly timing gear
Circle assembling deviation measures, including dynamic measurement and static measurement.The engine timing angle measurement system can be with
It is used as supplemental measurement tool and carries out compression ratio measurement, engine air valve lift measurement, overlapping angular measurement etc..
The embodiment of the present invention also provides a kind of engine timing angle measurement method, carries out with reference to the accompanying drawing specifically
It is bright.
Referring to Fig. 9, a kind of flow chart of engine timing angle measurement method in the embodiment of the present invention is given.The hair
Motivation timing angle measurement method may comprise steps of.
Step 91,1 cylinder upper position-arresting point of engine is determined.
In order to improve the accuracy that engine crankshaft absolute position determines.And simplify operation, in an embodiment of the present invention,
Engine crankshaft timing angle can be determined using the engine timing angle measurement unit provided in the above embodiment of the present invention
And absolute position.Specifically, the fixed part 11 in crankshaft timing angle measuring device is connect with spindle housing 12, the fixation
Portion 11 is fixed on engine crankshaft, and the spindle housing 12 can be rotated relative to the fixed part 11, the second dip measuring device
It is fixedly installed in the spindle housing 12.After being installed, engine crankshaft and engine crankshaft correct timing angle measurer
It can refer to Figure 12 in the relative position of a cylinder top dead centre, wherein the first dip measuring device is Sensor1.
When installing the crankshaft timing angle measuring device, crankshaft may be at any position, by the crankshaft timing
After angle measurement unit is installed, using abswolute level line as zero-deviation position, crankshaft machinery timing position is positioned into base
Level is set, and is rotated the spindle housing 12 to first position, is determined engine timing using cylinder body base position location hole 121
Cylinder body base position adaptation pin 122 is inserted into engine timing datum hole, while being also the benchmark of crankshaft timing by base position
Position.It takes out cylinder body base position and is adapted to pin 122, continue to rotate the spindle housing 12 to crankshaft rear end third Unequal distance hole,
When crank reference position location hole 123 is overlapped with the crankshaft rear end third Unequal distance hole, by the crank reference position
Adaptation pin 124 is inserted into and confirms crankshaft timing base position.
It is special using perception of the capacitance acceleration sensor for G gravity direction after measurement position confirmation twice above
Property, engine tilts angular error can be effectively eliminated, it is corresponding in the first position according to first dip measuring device
First angle determines one cylinder top dead center position of crankshaft in the corresponding second angle in the second position.It is surveyed from first inclination angle
It measures device and reads crankshaft absolute position θkw。
θkw=θm+θs1+θ1； (1)
Wherein, θkwFor the output valve of the first dip measuring device；θmFor engine base deviation；θs1For the measurement of the first inclination angle
Device installation deviation；θ1It is crankshaft with respect to a cylinder top dead center position.
In an embodiment of the present invention, first dip measuring device, second dip measuring device, the third
Dip measuring device and the 4th dip measuring device all can be capacitance acceleration transducers.
In specific implementation, the timing deviation angle in measurement engine under virtual condition, needs to calculate engine and exists
Location deflection angle under virtual condition, crank rotation angle, cam axle angle, the first dip measuring device, third are inclined
The installation deviation angle of angle measuring device, the 4th dip measuring device.3~Figure 16 referring to Fig.1, figure label OT indicate engine
Base position, admission cam shaft 1, exhaust cam shaft 2, crankshaft 50.By taking Dual Over Head Camshaft as an example, it is primarily present following several
Situation.
When state shown in engine is in Figure 13, engine is bent in ideal position namely engine base zero deflection
Axis timing zero deflection, at this point, θm=0, θ1=0.
When state shown in engine is in Figure 14, crankshaft timing zero deflection, while engine base has deviation, starts
Machine pedestal deviation can be obtained by capacitance acceleration transducer.
When engine is in state shown in figure 15, engine base zero deflection, i.e. θm=0.Crankshaft timing has deviation,
It can be measured by engine crankshaft correct timing angle measurer, i.e. θ1≠ 0, θs1Installation for the first dip measuring device is inclined
Difference can have calibration to record.Engine ideal actual position be the crankshaft center of circle in parallel and ground, and cross crankshaft center of circle Y-axis axis
With g gravity axis perpendicular to ground, i.e. one cylinder top dead center position of crankshaft and measured crankshaft timing position has deviation, passes through electricity
Appearance formula acceleration transducer and deviation algorithm can calculate corresponding deviation.
When state shown in engine is in Figure 16, crankshaft timing has deviation, while engine base has deviation.It can lead to
The total deviation value that engine base and crankshaft timing is calculated in capacitance acceleration transducer is crossed, it is suitable using cylinder body base position
Distribution 122 locks cylinder body datum hole and determines between crankshaft and the position engine timing (a cylinder top dead centre Top Dead Center)
Angular relationship, reuse crank reference position adaptation 124 locking crankshaft timing base position of pin.Then pass through engine crankshaft
Ideal timing position was that center of circle X-axis is parallel to ground, and crosses center of circle Y-axis axis and g gravity axis perpendicular to ground, that is, was calculated
Difference under engine crankshaft ideal timing deviation and crankshaft timing situation devious out.
In specific implementation, engine crankshaft can be transported using tradition machinery formula crankshaft timing fixture or labelling method etc.
It goes near a cylinder top dead centre (Top Dead Center), after tradition machinery formula crankshaft timing fixture is then installed to crankshaft
End, i.e., the confirmation of complete one cylinder top dead centre of coupled engines.According to the difference of engine type, hair can also be determined using labelling method
One cylinder top dead centre of motivation.
It will be clockwise by crankshaft machinery timing position positioning datum position using abswolute level line as " zero " differential location
Direction is as positive direction.Using tradition machinery formula crankshaft timing fixture or labelling method etc., when confirming one cylinder top dead centre of crankshaft,
θ1: crankshaft relative mechanical top dead centre rotational angle theta1=0, i.e. default engine crank portion does not have timing deviation, so timing
Deviation is zero.
θs1: due to the capless acceleration transducer such as tradition machinery formula fixture or labelling method, capacitance acceleration sensing
Device installation deviation θs1=0.
θkw、θm: crankshaft absolute position θkwEqual to engine base deviation θm.Similarly, it has been determined that one cylinder top dead centre of crankshaft,
The middle θ of thiskw=θm, wherein engine base deviation θmIt can be calculated by capacitance acceleration transducer on camshaft, i.e.,
Cam axle portion individually can voluntarily calculate engine base deviation.
Step 92, the absolute position of engine cam is obtained using engine cam correct timing angle measurer.
When determining one cylinder top dead centre of crankshaft using tradition machinery formula crankshaft timing fixture, engine cam is being used just
When angle measurement unit obtain engine cam absolute position before, need using camshaft timing calibrating block to engine
Timing position is demarcated, wherein the structure of the camshaft timing calibrating block can be found in Fig. 5.
Specifically, either measuring admission cam shaft timing deviation before measurement engine cam axis deviation every time
Or exhaust cam shaft timing deviation, is both needed to for camshaft timing calibrating block being mounted on camshaft, to engine timing position
It is demarcated.Specifically, admission cam shaft 1 is connect with the axis hole 3 of the camshaft timing calibrating block, exhaust cam shaft 2 with
The axis hole 4 of the camshaft timing calibrating block connects.When camshaft timing calibrating block can correctly be mounted on engine cam
When axis, engine is in timing position.Then, engine cam correct timing angle measurer is installed on engine cam
Axis, and the reading of the second dip measuring device is read, to obtain the absolute position of engine cam.
In specific implementation, engine cam correct timing angle measurer is installed on engine cam, wherein institute
Stating engine cam correct timing angle measurer includes: rotation axis and the second dip measuring device, and the first of the rotation axis
End and the engine cam axis connection, second dip measuring device are fixed on the second end of the rotation axis；From described
Second dip measuring device obtains the engine cam timing deviation angle；According to engine deviation, camshaft degree, incline
Angle measuring device installation deviation and the engine cam timing deviation angle obtain the camshaft absolute position.
In one embodiment of the invention, when the camshaft is Dual Over Head Camshaft, third is installed on admission cam shaft
Dip measuring device obtains admission cam shaft timing deviation angle, in exhaust cam shaft from the third dip measuring device
On the 4th dip measuring device is installed, from the 4th dip measuring device obtain exhaust cam shaft timing deviation angle.It can
To obtain admission cam shaft absolute position using formula (2).Exhaust cam shaft absolute position is obtained using formula (3).
Wherein, αniFor admission cam shaft absolute position, θmFor engine base deviation, θs2For third dip measuring device peace
Deviation is filled,For admission cam Shaft angle, θniFor admission cam shaft timing deviation, θ1For crankshaft relative mechanical top dead centre corner,
αnoFor exhaust cam shaft absolute position, θs3For the 4th dip measuring device installation deviation, θn0For exhaust cam shaft timing deviation.
If the confirmation of one cylinder top dead centre of engine zero deflection namely complete coupled engines.
Figure 10 gives admission cam shaft when having deviation, and camshaft timing position view, Figure 11 give exhaust cam shaft
Camshaft timing position view when having deviation, wherein third dip measuring device is Sensor2, the 4th dip measuring device
For Sensor3.
Step 93, according to acquired engine cam absolute position and the absolute position of the engine crankshaft,
Calculate engine timing angle.
In specific implementation, admission cam shaft is with respect to crank position deviation θniIt can be obtained using formula (4).
Exhaust cam shaft is with respect to crank position deviation θnoIt can be obtained using formula (5).
Admission cam shaft phase and exhaust cam shaft relative position deviation θioIt can be obtained using formula (6).
θio=ani-ano-θs2+θs3 (6)
Wherein, θmFor the first dip measuring device output valve, aniFor third dip measuring device output valve, anoIncline for the 4th
Angle measuring device output valve.
In specific implementation, the first dip measuring device, the second dip measuring device, third dip measuring device, the 4th
Dip measuring device is all made of capacitance acceleration transducer.The working principle of capacitance acceleration transducer is as follows:
Referring to Fig.1 7, give a kind of structural schematic diagram of capacitance acceleration transducer in the embodiment of the present invention.Figure 18
For capacitance acceleration transducer working principle diagram.It is former below with reference to work of the Figure 17 and Figure 18 to capacitance acceleration transducer
Reason is illustrated.
In specific implementation, capacitance acceleration transducer generally uses spring mass system, and one of electrode is fixed,
Another variation electrode is flexible sheet, changes the gap between mass block and fixed electrode when quality is moved by acceleration effect
And then make capacitance variation.The integrated wireless data signal transmitter in capacitance acceleration transducer cooperates terminal wireless number
According to restricting the number receiver, wireless data transmission may be implemented.
Based on Newton's second law F=ma, when capacitance acceleration transducer is static to be horizontally arranged in the plane, capacitor
Formula acceleration transducer is only by the peaceful reaction force for facing itself of G gravity.
When capacitance acceleration transducer relative to terrestrial gravitation direction generate inclination angle, use capacitance acceleration acceleration
When inclination angle alpha of the sensor to measure object, since gravity can be passed using gravitational vectors and its in capacitance acceleration
Projection on sensor axis determines tilt angle.Then, this angle value is detected by sensing element, or will be perpendicular to ground
Acceleration of gravity by the dependent variable of sensing element be converted into electric signal output device.As shown in figure 17, mass block m has been
Know, capacitance acceleration transducer, by gravity, therefore has the acceleration of gravity of 1g in static placement.Utilize this
Property can calculate tilt angle on a vertical plane by component of the measurement acceleration of gravity in X, Y-axis.Gravity
Acceleration important will act on the sensor sensing direction axis Ax and satisfaction:
Sin α=Ax/g (7)
Then (8) Ax=g*sin α
Wherein, Ax is the measured value of acceleration, and g is acceleration of gravity, and α is engine timing measurement angle.
According to Hooke's law F=-K*x, i.e., mass block leaves the power F being subject at certain point x of spring balancing position and position
Move the directly proportional and contrary referred to as linear response of size.Capacitance acceleration transducer can regard one as from amechanical angle
A quality-spring-damping system.When sensor generates inclination angle relative to terrestrial gravitation direction, by measuring quality-bullet
Spring-damping system obtains:
F=-kx=ma； (9)
A=k/m*x； (10)
A=d^2x/dt^2； (11)
C=(ε S)/； (12)
Charge C between acceleration a and electrode suffered by capacitance acceleration transducer is obtained according to formula (10) and formula (12)
It is inversely proportional.
A=k/m* (ε S)/C； (13)
To passing through measurement displacement x and acceleration a can be found out after quadraturing, to obtain the power F, F being subject at displacement x
=Ax.
Ax=gsin α, Ay=gcos α； (14)
α=arctan Ax/Ay； (15)
Wherein, k is stiffness factor, and m is mass block quality, and x is displacement.
However, in practical applications, it is difficult to ensure that tilting to generation in X-Y plane, 9 three axis provided incline referring to Fig.1
Angle stress decomposition principle figure, when the inclination angle survey calculation formula for using three capacitance acceleration transducers in X-Y-Z plane
It can expand as follows:
Wherein, Ax is measured value of the acceleration in x-axis direction, and Ay is measured value of the acceleration in y-axis direction, and Az is to accelerate
Spend the measured value in z-axis direction, αxFor the angle of Ax and gravity G, αyFor the angle of Ay and gravity G, αzFor the folder of Az and gravity G
Angle, charge between C electrode, k are stiffness factor, and m is mass block quality, and x be that displacement F=Ax is projection in the x direction, and g attaches most importance to
Power acceleration, G are gravity, and α is engine timing angular deviation.
In an embodiment of the present invention, it after being demarcated using camshaft timing calibrating block to engine timing, can adopt
Engine is being measured by the following manner just with the engine cam correct timing angle measurer that the above embodiment of the present invention provides
When deviation, be described in detail below with reference to Fig. 3.
By waist hole on air inlet fixed hub 151 and exhaust fixed hub 152 and fastener by camshaft timing
Angle measurement unit is fixed on engine, at this point, engine cam and admission cam shaft rotation axis 141 and exhaust cam
Axis rotation axis 142 is simultaneously not connected with, stopping on the shotpin slot 1411 in admission cam shaft rotation axis 141 and air inlet fixed hub 151
Pin hole 1511 is not bolted temporarily, on the shotpin slot 1421 in exhaust cam shaft rotation axis 142 and exhaust fixed hub 152
Shotpin hole be not bolted temporarily.The reading of third dip measuring device and the 4th dip measuring device is read respectively,
Three axial rakes are calculated using formula (16), (17), (18) and (19), i.e., by determining that third is inclined after the measurement of Ax, Ay and Az
The engine base of plane inclines where the engine base inclination angle of plane where angle measuring device and the 4th dip measuring device
Angle.
The camshaft timing angle measurement unit is pushed, exhaust cam shaft rotation axis 142 is inserted into exhaust cam shaft 2,
Admission cam shaft rotation axis 141 is inserted into admission cam shaft 1, since the groove profile length of shotpin slot 1411 is greater than shotpin hole 1511
Aperture, when pushing admission cam shaft rotation axis 141, shotpin slot 1411 and the relative position in shotpin hole 1511 change；Accordingly
Ground, when pushing exhaust cam shaft rotation axis 142, the relative position of shotpin slot 1421 and the shotpin hole on exhaust fixed hub 152
It changes.Shotpin slot 1411 in admission cam shaft rotation axis 141 passes through with the shotpin hole 1511 on air inlet fixed hub 151
Bolt is fixed, and the shotpin hole on the shotpin slot 1421 in exhaust cam shaft rotation axis 142 and exhaust fixed hub 152 passes through bolt
It is fixed.Measure θniAdmission cam shaft timing deviation, θn0Exhaust cam shaft timing deviation value.Engine cam ideal timing position
It was set to center of circle X-axis and is parallel to ground, and cross center of circle Y-axis axis and g gravity axis perpendicular to ground, finally by formula
(16), (17), (18), (19), (2), (3) calculate engine cam ideal timing deviation and camshaft timing deviation feelings
Algebraical sum under condition.Admission cam shaft phase can be calculated with exhaust cam shaft relative position deviation by formula (6).
By the deviation algorithm of camshaft timing angle measurement unit, air inlet is calculated by formula (4) and formula (5)
For camshaft with respect to the timing deviation of one cylinder top dead centre of crankshaft, exhaust cam shaft, and can be by wireless with respect to crank position deviation
Transmission is shown at the end PC, wherein the camshaft can be double overhead DOHC- intake and exhaust cam axis, or single overhead
OHC- single camshaft.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with instructing relevant hardware by program, which can be stored in a computer readable storage medium, storage
Medium may include: ROM, RAM, disk or CD etc..
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (24)
1. a kind of engine cam correct timing angle measurer characterized by comprising rotation axis and the second inclination angle measurement dress
It sets, in which:
The first end and engine cam axis connection of the rotation axis；
Second dip measuring device, is fixed on the second end of the rotation axis, for measuring the positive hour angle of engine cam
Degree.
2. engine cam correct timing angle measurer according to claim 1, which is characterized in that further include: it is fixed
Axle sleeve is sheathed on the rotation axis.
3. engine cam correct timing angle measurer according to claim 2, which is characterized in that the fixed hub
It is provided with shotpin hole, the shotpin slot with shotpin hole cooperation is provided in the rotation axis.
4. engine cam correct timing angle measurer according to claim 2, which is characterized in that further include: it adjusts
Rotation axis axle sleeve and regulating arm, in which:
The adjusting rotation axis axle sleeve, is sheathed on the rotation axis；
The regulating arm is detachably connected with the adjusting rotation axis axle sleeve, suitable for rotating the adjusting rotation axis axle sleeve to adjust
Save engine cam angle.
5. engine cam correct timing angle measurer according to claim 1, which is characterized in that further include: cam
Axis sliding support is sheathed on the rotation axis.
6. engine cam correct timing angle measurer according to claim 5, which is characterized in that the engine is convex
Wheel shaft is Dual Over Head Camshaft, comprising: admission cam shaft and exhaust cam shaft.
7. engine cam correct timing angle measurer according to claim 6, which is characterized in that the rotation axis packet
It includes:
Admission cam shaft rotation axis, the first end and admission cam axis connection of the admission cam shaft rotation axis；
Exhaust cam shaft rotation axis, the first end and exhaust cam axis connection of the exhaust cam shaft rotation axis.
8. engine cam correct timing angle measurer according to claim 7, which is characterized in that the camshaft is sliding
Dynamic bracket, comprising: admission cam shaft sliding support and exhaust cam shaft sliding support, in which:
The admission cam shaft sliding support is sheathed on the admission cam shaft rotation axis, and slides with the exhaust cam shaft
Bracket clamping；
The exhaust cam shaft sliding support is sheathed on the exhaust cam shaft rotation axis.
9. engine cam correct timing angle measurer according to claim 8, which is characterized in that the admission cam
One of them of axis sliding support and the exhaust cam shaft sliding support are equipped with interconnecting piece, another is equipped with described for accommodating
The receiving hole of interconnecting piece.
10. engine cam correct timing angle measurer according to claim 1, which is characterized in that the rotation axis
Second end be equipped with groove, the bottom of the groove is plane and the excessively described rotation axis axle center, second dip measuring device
It is fixed in the groove.
11. engine cam correct timing angle measurer according to claim 1, which is characterized in that described second inclines
Angle measuring device is capacitance acceleration transducer.
12. a kind of engine timing angle measurement system characterized by comprising as claimed in any one of claims 1 to 11
Engine cam correct timing angle measurer and engine crankshaft correct timing angle measurer, in which: the engine crankshaft
Timing measuring device, comprising:
Spindle housing is provided with cylinder body base position location hole and crank reference position location hole；
Fixed part, one end are fixedly connected with engine crankshaft, and the other end is connect with the spindle housing, and can the relatively described spindle housing
Rotation；
First dip measuring device is fixed on the spindle housing, for passing through cylinder body base position location hole and described
After crank reference position location hole determines one cylinder top dead centre of engine, engine crankshaft timing angle is measured.
13. engine timing angle measurement system according to claim 12, which is characterized in that the engine crankshaft is just
When measuring device, further includes:
Cylinder body base position adaptation pin, matches with cylinder body base position location hole；
Crank reference position adaptation pin, matches with the crank reference position location hole.
14. engine timing angle measurement system according to claim 12, which is characterized in that the engine crankshaft is just
When measuring device, further includes: signal wheel location hole is set in the spindle housing.
15. engine timing angle measurement system according to claim 14, which is characterized in that the signal wheel location hole
Between cylinder body base position location hole and the crank reference position location hole.
16. engine timing angle measurement system according to claim 12, which is characterized in that the fixed part is equipped with
Protrusion, the spindle housing are equipped with groove, and the groove is for accommodating the protrusion.
17. engine timing angle measurement system according to claim 12, which is characterized in that be arranged in the spindle housing
There is receiving portion, for placing first dip measuring device.
18. a kind of engine timing angle measurement method characterized by comprising
Determine 1 cylinder upper position-arresting point of engine；
Engine cam is obtained using engine cam correct timing angle measurer as claimed in any one of claims 1 to 11
The absolute position of axis；
According to acquired engine cam absolute position and the absolute position of the engine crankshaft, engine is being calculated just
When angle.
19. engine timing angle measurement method according to claim 18, which is characterized in that start described in the use
Machine camshaft timing angle measurement unit obtains the absolute position of engine cam, comprising:
The engine cam timing deviation angle is obtained from second dip measuring device；
Just according to engine deviation, camshaft degree, the second dip measuring device installation deviation and the engine cam
When misalignment angle obtain the camshaft absolute position.
20. engine timing angle measurement method according to claim 19, which is characterized in that when the engine cam
When axis is Dual Over Head Camshaft, the acquisition engine cam absolute position, comprising:
Third dip measuring device and the 4th dip measuring device are separately installed on admission cam shaft and exhaust cam shaft,
Admission cam shaft timing deviation angle is obtained from the third dip measuring device, is obtained from the 4th dip measuring device
Exhaust cam shaft timing deviation angle；
According to engine deviation, camshaft degree, third dip measuring device installation deviation and the admission cam shaft timing
Misalignment angle obtains the admission cam shaft absolute position；
According to engine deviation, camshaft degree, the 4th dip measuring device installation deviation and the admission cam shaft timing
Misalignment angle obtains the exhaust cam shaft absolute position.
21. engine timing angle measurement method according to claim 20, which is characterized in that the determining engine one
Cylinder top dead centre, comprising:
Engine crankshaft correct timing angle measurer is installed on engine crankshaft, wherein the engine crankshaft timing angle
Measuring device includes: spindle housing, fixed part and the first dip measuring device, in which:
The spindle housing is provided with cylinder body base position location hole and crank reference position location hole；
The fixed part, one end are fixedly connected with the engine crankshaft, and the other end is connect with the spindle housing, and can be with respect to institute
State spindle housing rotation；
First dip measuring device, is fixed on the spindle housing, for measuring the engine crankshaft timing angle；
Crankshaft machinery timing position positioning datum position is rotated into the spindle housing using abswolute level line as zero-deviation position
To first position, engine timing base position is determined using cylinder body base position location hole, reads first inclination angle
The first angle that measuring device is shown；
The spindle housing is rotated to the second position, crankshaft timing base position is determined using the crank reference position location hole,
Read the second angle that first dip measuring device is shown；
According to the first angle and second angle, one cylinder top dead center position of engine is determined.
22. engine timing angle measurement method according to claim 21, which is characterized in that the first inclination angle measurement
Device, second dip measuring device, the third dip measuring device and the 4th dip measuring device are capacitor
Formula acceleration transducer.
23. engine timing angle measurement method according to claim 22, which is characterized in that described according to acquired in
Engine cam absolute position and the absolute position of the engine crankshaft, obtain engine timing angle, comprising:
Engine timing angular deviation α is calculated using following formula:
F=ma；
C=ε S/x；
F=kx；
Sina=Ax/g, cosa=Ay/g；
Wherein, Ax is measured value of the acceleration in x-axis direction, and Ay is measured value of the acceleration in y-axis direction, and Az is that acceleration exists
The measured value in z-axis direction, charge between C electrode, k are stiffness factor, and m is mass block quality, and x is that displacement F=Ax is in the x direction
Projection, g is acceleration of gravity, and G is gravity, and α is engine timing angular deviation.
24. engine timing angle measurement method according to claim 21, which is characterized in that further include: described it will turn
Pedestal turns to signal wheel base position, obtains the angular deviation between the relative signal wheel of engine crankshaft timing position.
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| CN110195652A (en) * | 2019-06-29 | 2019-09-03 | 潍柴动力股份有限公司 | A method of judging engine abnormity |
| CN110890823A (en) * | 2019-11-26 | 2020-03-17 | 常州市多维电器有限公司 | Motor and driving power assisting system |
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