CN114813149A - Phase measurement method and device - Google Patents
Phase measurement method and device Download PDFInfo
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- CN114813149A CN114813149A CN202110082490.4A CN202110082490A CN114813149A CN 114813149 A CN114813149 A CN 114813149A CN 202110082490 A CN202110082490 A CN 202110082490A CN 114813149 A CN114813149 A CN 114813149A
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- G01M15/00—Testing of engines
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Abstract
The embodiment of the application discloses a phase measurement method and a phase measurement device, which can acquire a pulse signal obtained by detecting a convex tooth of a crankshaft by a crankshaft position sensor, determine an initial position of the crankshaft according to the pulse signal, and determine rotation speed information of an internal combustion engine connected with the crankshaft, and determine a crankshaft phase of the crankshaft between the initial position and a target position according to a first time length of the crankshaft from the initial position to the target position, the stroke number of the internal combustion engine and the rotation speed information. Therefore, by adopting the method and the device of the embodiment of the application, a new low-level software equipment driving program is not required to be created, a large amount of code development and test work is avoided, the phase of the crankshaft can be accurately obtained, and the performance of the internal combustion engine is not influenced.
Description
Technical Field
The present application relates to the field of control, and in particular, to a method and an apparatus for phase measurement.
Background
At present, with the increasing strictness of emission regulations, the demand for internal combustion engines is also increasing. Internal combustion engines are designed around a single rotating crankshaft driven by reciprocating pistons. Modern internal combustion engines that use electronic fuel injectors, ignition coils with built-in igniters and other devices that must be driven at precise angular positions during crankshaft rotation, achieve many performance and efficiency improvements by rapidly calculating crankshaft position and controlling actuators with position resolution below 0.1. As a high-speed rotating part, the numerical values of the angles of a crankshaft and a camshaft of the internal combustion engine are high in time sensitivity, and if the angle measurement is not accurate, so that the action time of an actuator has a slight error in a time domain, the error of the actuator in the angle domain is amplified, and the working state, the fuel economy and the emission performance of the internal combustion engine are seriously influenced. Therefore, accurate measurement of the phases of the crankshaft and the camshaft of the internal combustion engine is very important for improving the economy and the performance of the internal combustion engine.
In recent years, new microcontroller and peripheral codes of the single chip microcomputer of the internal combustion engine are developed every year, a plurality of ingenious internal combustion engine position processing and tracking methods are designed, and the performance and the function are improved. Unfortunately, with the advent of each new single chip microcomputer, new low-level software device drivers must also be created to perform new and improved engine crankshaft, engine position measurement functions, requiring extensive code development and testing efforts. Debugging of angle-based interrupts to timing-based software loops can also be difficult.
How to accurately measure and obtain the phase of a crankshaft under the conditions of avoiding creating a new low-level software device driver and avoiding a large amount of code development and test work and ensuring that the performance of an internal combustion engine is not influenced is a technical problem to be solved urgently in the field.
Disclosure of Invention
In order to solve the technical problems, the application provides a phase measurement method and a phase measurement device, which can avoid a large amount of code development and test work without creating a new low-level software device driver, can accurately obtain the phase of a crankshaft, and ensure that the performance of an internal combustion engine is not influenced. The embodiment of the application discloses the following technical scheme:
in a first aspect, an embodiment of the present application provides a phase measurement method, including:
acquiring a pulse signal obtained by detecting a convex tooth of a crankshaft by a crankshaft position sensor;
determining an initial position of the crankshaft and rotation speed information of an internal combustion engine connected with the crankshaft according to the pulse signal;
determining a crankshaft phase of the crankshaft between an initial position and a target position based on a first duration of time the crankshaft has experienced from the initial position to the target position, a number of strokes of the internal combustion engine, and the rotational speed information.
Optionally, a crankshaft phase of the crankshaft between the initial position and the target position is determined using the following equation:
A＝(B*C*180°)/D；
wherein A is a crankshaft phase between the initial position and the target position;
b is a first time period that the crankshaft has experienced from an initial position to a target position;
c is the stroke number of one cycle of the internal combustion engine;
when C is 2, D is the time for the crankshaft to rotate one turn at the rotating speed;
when C is 4, D is the time that the crankshaft makes two revolutions at the rotational speed.
Optionally, the method further includes:
calculating the phase of a camshaft corresponding to the crankshaft according to the crankshaft phase; when the crankshaft is located at the initial position of the crankshaft, the camshaft is located at the initial position of the camshaft, and the crankshaft phase is twice the camshaft phase.
Optionally, determining the rotation speed information of the crankshaft-connected internal combustion engine according to the pulse signal comprises:
determining the rotation speed of the crankshaft according to a second duration elapsed between rising edges of adjacent pulses in the pulse signal and the relative tooth number of the crankshaft; when the crankshaft is in a tooth-missing type, the relative tooth number is equal to the actual tooth number of the crankshaft plus the tooth-missing number of the crankshaft; when the crankshaft is in a dense-tooth type, the relative tooth number is equal to the actual tooth number of the crankshaft minus the dense tooth number of the crankshaft; when the crankshaft is of a uniform type, the relative number of teeth is equal to the actual number of teeth of the crankshaft;
and calculating the rotation speed of the internal combustion engine according to the rotation speed of the crankshaft.
Optionally, the second duration is determined according to the number of intervals of the synchronization mark between the rising edges of adjacent pulses of the pulse signal; the first time length is determined according to the number of intervals of the synchronous mark between the crankshaft from the initial position to the target position; the synchronization mark is continuously generated according to a preset period.
Optionally, the determining the initial position of the crankshaft according to the pulse signal includes:
identifying a unique characteristic of the crankshaft from the pulse signal;
and when the unique feature is located at a preset position and the camshaft meets a preset condition, setting the position of the unique feature as the initial position of the crankshaft.
In a second aspect, an embodiment of the present application provides a phase measurement apparatus, including:
the acquisition unit is used for acquiring a pulse signal obtained by detecting the convex teeth of the crankshaft by the crankshaft position sensor;
a first determination unit for determining an initial position of the crankshaft and rotational speed information of an internal combustion engine connected to the crankshaft based on the pulse signal;
a second determination unit configured to determine a crankshaft phase of the crankshaft between an initial position and a target position based on a first duration of time that the crankshaft has elapsed from the initial position to the target position, a number of strokes of the internal combustion engine, and the rotational speed information.
Optionally, a crankshaft phase of the crankshaft between the initial position and the target position is determined using the following equation:
A＝(B*C*180°)/D；
wherein A is a crankshaft phase between the initial position and the target position;
b is a first time period that the crankshaft has experienced from an initial position to a target position;
c is the stroke number of one cycle of the internal combustion engine;
when C is 2, D is the time for the crankshaft to rotate one turn at the rotating speed;
when C is 4, D is the time that the crankshaft makes two revolutions at the rotational speed.
Optionally, the apparatus further comprises:
the first calculating unit is used for calculating the phase of the camshaft corresponding to the crankshaft according to the phase of the crankshaft; the crankshaft phase is twice the camshaft phase.
Optionally, the first determining unit includes:
the first determining subunit is used for determining the rotating speed of the crankshaft according to a second time length elapsed between rising edges of adjacent pulses in the pulse signal and the relative tooth number of the crankshaft; when the crankshaft is in a tooth-missing type, the relative tooth number is equal to the actual tooth number of the crankshaft plus the tooth-missing number of the crankshaft; when the crankshaft is in a dense-tooth type, the relative tooth number is equal to the actual tooth number of the crankshaft minus the dense tooth number of the crankshaft; when the crankshaft is of a uniform type, the relative number of teeth is equal to the actual number of teeth of the crankshaft;
and the second calculation unit is used for calculating the rotation speed of the internal combustion engine according to the rotation speed of the crankshaft.
Optionally, the second duration is determined according to the number of intervals of the synchronization mark between rising edges of adjacent pulses of the pulse signal; the first time length is determined according to the number of intervals of the synchronous mark between the crankshaft from the initial position to the target position; the synchronization mark is continuously generated according to a preset period.
Optionally, the first determining unit includes:
the identification unit is used for identifying the unique characteristic of the crankshaft according to the pulse signal;
and the setting unit is used for setting the position of the unique feature as the initial position of the crankshaft when the unique feature is positioned at a preset position and the camshaft meets a preset condition.
According to the technical scheme, the phase measuring method and device can obtain the pulse signal obtained by detecting the convex teeth of the crankshaft by the crankshaft position sensor, determine the initial position of the crankshaft and the rotating speed information of the internal combustion engine connected with the crankshaft according to the pulse signal, and determine the crankshaft phase of the crankshaft between the initial position and the target position according to the first time length of the crankshaft from the initial position to the target position, the stroke number of the internal combustion engine and the rotating speed information. Therefore, by adopting the method and the device of the embodiment of the application, a new low-level software equipment driving program is not required to be created, a large amount of code development and test work is avoided, the phase of the crankshaft can be accurately obtained, and the performance of the internal combustion engine is not influenced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a phase measurement method according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a phase measurement apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The inventors of the present application have studied and found that, at present, with the increasing strictness of emission regulations, the demand for internal combustion engines is also increasing. Internal combustion engines are designed around a single rotating crankshaft driven by reciprocating pistons. Modern internal combustion engines that use electronic fuel injectors, ignition coils with built-in igniters and other devices that must be driven at precise angular positions during crankshaft rotation, achieve many performance and efficiency improvements by rapidly calculating crankshaft position and controlling actuators with position resolution below 0.1. As a high-speed rotating part, the numerical values of the angles of a crankshaft and a camshaft of the internal combustion engine are high in time sensitivity, and if the angle measurement is not accurate, so that the action time of an actuator has a slight error in a time domain, the error of the actuator in the angle domain is amplified, and the working state, the fuel economy and the emission performance of the internal combustion engine are seriously influenced. Therefore, accurate measurement of the phases of the crankshaft and the camshaft of the internal combustion engine is very important for improving the economy and the performance of the internal combustion engine.
In recent years, new microcontroller and peripheral codes of the single chip microcomputer of the internal combustion engine are developed every year, a plurality of ingenious internal combustion engine position processing and tracking methods are designed, and the performance and the function are improved. Unfortunately, with the advent of each new single chip microcomputer, new low-level software device drivers must also be created to perform new and improved engine crankshaft, engine position measurement functions, requiring extensive code development and testing efforts. Debugging of angle-based interrupts to timing-based software loops can also be difficult.
How to accurately measure and obtain the phase of a crankshaft under the conditions of avoiding creating a new low-level software device driver and avoiding a large amount of code development and test work and ensuring that the performance of an internal combustion engine is not influenced is a technical problem to be solved urgently in the field.
In order to solve the above technical problem, embodiments of the present application provide a phase measurement method and apparatus, which may acquire a pulse signal detected by a crankshaft position sensor from a tooth of a crankshaft, determine an initial position of the crankshaft according to the pulse signal, and determine rotational speed information of an internal combustion engine connected to the crankshaft, and determine a crankshaft phase of the crankshaft between the initial position and a target position according to a first duration of the crankshaft from the initial position to the target position, a number of strokes of the internal combustion engine, and the rotational speed information. Therefore, by adopting the method and the device of the embodiment of the application, a new low-level software equipment driving program is not required to be created, a large amount of code development and test work is avoided, the phase of the crankshaft can be accurately obtained, and the performance of the internal combustion engine is not influenced.
Various non-limiting embodiments of the present application are described in detail below with reference to the accompanying drawings.
Exemplary method
Referring to fig. 1, a flowchart of a phase measurement method according to an embodiment of the present disclosure is shown. As shown in fig. 1, may include:
s101, acquiring a pulse signal obtained by detecting the convex teeth of the crankshaft by the crankshaft position sensor.
In the embodiment of the application, the crankshaft position sensor can be used for detecting the convex teeth of the crankshaft to obtain the pulse signal. Firstly, the crankshaft position sensor can be a Hall effect type, a magnetoelectric induction type or a photoelectric type, and an original signal is obtained through the crankshaft position sensor, wherein the original signal may contain a plurality of noise waves, so that the original signal can be subjected to integral filtering firstly, and positive and negative noise waves with pulse widths lower than a set value are rejected, so that a pulse signal based on the convex teeth of the crankshaft is obtained.
Similarly, the camshaft position sensor can be used for detecting the camshaft
The crankshaft and camshaft position sensors are respectively connected in different analog quantity acquisition channels of the signal acquisition equipment through wiring harnesses; the signal acquisition equipment is arranged on the bottom plate based on the FPGA; bottom plate based on FPGA is connected to host computer through net gape communication module
And S102, determining the initial position of the crankshaft and the rotating speed information of the internal combustion engine connected with the crankshaft according to the pulse signal.
In the embodiment of the present application, the rotation speed of the crankshaft may be determined according to the second duration elapsed between rising edges of adjacent pulses in the pulse signal and the relative number of teeth of the crankshaft. When the crankshaft is in a tooth-missing type, the relative tooth number is equal to the actual tooth number of the crankshaft plus the tooth-missing number of the crankshaft; when the crankshaft is in a dense-tooth type, the relative tooth number is equal to the actual tooth number of the crankshaft minus the dense-tooth number of the crankshaft; when the crankshaft is of a uniform type, the relative number of teeth is equal to the actual number of teeth of the crankshaft.
Specifically, the second duration elapsed between the rising edges of the pulse signals represents the duration elapsed from the crankshaft rotating one tooth to the next tooth, the second duration is determined according to the number of intervals of the synchronization mark between the rising edges of adjacent pulses of the pulse signals, the synchronization mark is continuously generated according to a preset period, for example, the synchronization mark can be a clock point mark, and the preset period can be selected by a person skilled in the art according to actual situations, for example, 1/40 msec is used.
The speed of the crankshaft is determined based on the second duration and the relative number of teeth of the crankshaft, for example, (60 x 4 x 10 x 7)/(the second duration x relative number of teeth) when the crankshaft is missing and the predetermined period 1/40M seconds.
The phase measurement of the embodiment of the application is carried out after the rotating speed of the internal combustion engine is greater than the lowest stall rotating speed of the internal combustion engine in order to enable the internal combustion engine to stably operate, so that the finally measured phases of the crankshaft and the camshaft are obtained under the working condition that the internal combustion engine stably operates.
In addition, the unique feature of the crankshaft can be identified according to the pulse signal, and when the unique feature is located at a preset position and the camshaft meets a preset condition, the position where the unique feature is located is set as the initial position of the crankshaft. The unique characteristic may be set by a person skilled in the art, for example, when the crankshaft is of a missing tooth type, the missing tooth may be set as the unique characteristic, when the number of strokes of the internal combustion engine is four, the internal combustion engine operates for one cycle, the crankshaft makes two revolutions, and in order to distinguish whether the phases of the crankshaft correspond to the intake stroke and the compression stroke, or correspond to the power stroke and the exhaust stroke in real time, the position of the camshaft corresponding to one revolution or two revolutions of the crankshaft is different, for example, the crankshaft makes one revolution, the preset condition is that: the camshaft is at the high level position, and the position of the convex teeth of the camshaft is the corresponding high level position, namely the unique characteristic of the crankshaft of the first circle corresponds to the convex teeth of the camshaft. The crankshaft rotates for two circles, and the preset conditions are as follows: the camshaft is at the right time at the low level position, and the position of the fluted disc between the convex teeth of the camshaft is the corresponding low level position, namely the unique characteristic of the crankshaft of the second ring corresponds to the fluted disc of the camshaft. Therefore, the stroke of which stage the real-time phase of the crankshaft corresponds to can be judged according to the level state, and the real-time working state of the internal combustion engine is obtained.
S103, determining a crankshaft phase of the crankshaft between the initial position and the target position according to the first time length of the crankshaft from the initial position to the target position, the stroke number of the internal combustion engine and the rotating speed information.
In an embodiment of the present application, a crankshaft phase of a crankshaft between an initial position and a target position is determined using the following equation:
A＝(B*C*180°)/D；
wherein A is a crankshaft phase between an initial position and a target position;
b is a first time period that the crankshaft experiences from the initial position to the target position;
c is the stroke number of one period of the internal combustion engine;
when C is 2, D is the time of one rotation of the crankshaft;
when C is 4, D is the time it takes for the crankshaft to make two revolutions at the speed.
The first duration may be determined according to the number of intervals of the synchronization mark between the crankshaft from the initial position to the target position.
After the crankshaft phase is obtained through calculation, the phase of the camshaft corresponding to the crankshaft can be obtained through calculation according to the crankshaft phase, and when the crankshaft is located at the initial position of the crankshaft, the camshaft is located at the initial position of the camshaft, and then the crankshaft phase is twice as large as the camshaft phase.
And the phase position of the crankshaft can be updated in real time, when the vehicle accelerates or decelerates, the rotating speed of the internal combustion engine changes along with the phase position, the rotating speed of the crankshaft changes, and the first time period, the second time period, the target position and the like can be updated in real time. And calculating to obtain a new crankshaft phase according to the updated first time length and the second time length.
And the crankshaft phase and the camshaft phase which are obtained by real-time updating can be converted into angle signals to be displayed on a human-computer interaction interface or other controllers, so that high-precision angle signals are provided for an internal combustion engine actuator which is partially driven based on angles.
The embodiment of the application provides a phase measurement method, which can acquire a pulse signal obtained by detecting a convex tooth of a crankshaft by a crankshaft position sensor, determine an initial position of the crankshaft according to the pulse signal, and rotation speed information of an internal combustion engine connected with the crankshaft, and determine a crankshaft phase of the crankshaft between the initial position and a target position according to the number of strokes of the internal combustion engine which is experienced by the crankshaft from the initial position to the target position and the rotation speed information. Therefore, by adopting the method and the device of the embodiment of the application, a new low-level software equipment driving program is not required to be created, a large amount of code development and test work is avoided, the phase of the crankshaft can be accurately obtained, and the performance of the internal combustion engine is not influenced.
Exemplary devices
Referring to fig. 2, a schematic diagram of a phase measurement apparatus according to an embodiment of the present disclosure is shown. The device comprises:
an acquisition unit 201, configured to acquire a pulse signal obtained by detecting a protruding tooth of a crankshaft by a crankshaft position sensor;
a first determination unit 202 for determining an initial position of the crankshaft and information on a rotational speed of an internal combustion engine connected to the crankshaft based on the pulse signal;
a second determination unit 203 for determining a crankshaft phase of the crankshaft between an initial position and a target position based on a first duration of time that the crankshaft has elapsed from the initial position to the target position, a number of strokes of the internal combustion engine, and the rotational speed information.
Optionally, a crankshaft phase of the crankshaft between the initial position and the target position is determined using the following equation:
A＝(B*C*180°)/D；
wherein A is a crankshaft phase between the initial position and the target position;
b is a first time period that the crankshaft has experienced from an initial position to a target position;
c is the stroke number of one cycle of the internal combustion engine;
when C is 2, D is the time for the crankshaft to rotate one turn at the rotating speed;
when C is 4, D is the time that the crankshaft makes two revolutions at the rotational speed.
Optionally, the apparatus further comprises:
the first calculating unit is used for calculating the phase of the camshaft corresponding to the crankshaft according to the phase of the crankshaft; when the crankshaft is located at the initial position of the crankshaft, the camshaft is located at the initial position of the camshaft, and the crankshaft phase is twice the camshaft phase.
Optionally, the first determining unit includes:
the first determining subunit is used for determining the rotating speed of the crankshaft according to a second time length elapsed between rising edges of adjacent pulses in the pulse signal and the relative tooth number of the crankshaft; when the crankshaft is in a tooth-missing type, the relative tooth number is equal to the actual tooth number of the crankshaft plus the tooth-missing number of the crankshaft; when the crankshaft is in a dense-tooth type, the relative tooth number is equal to the actual tooth number of the crankshaft minus the dense tooth number of the crankshaft; when the crankshaft is of a uniform type, the relative number of teeth is equal to the actual number of teeth of the crankshaft;
and the second calculation unit is used for calculating the rotation speed of the internal combustion engine according to the rotation speed of the crankshaft.
The setting of each unit or module of the apparatus of the present application can be implemented by referring to the method shown in fig. 1, and is not described herein again.
The embodiment of the application provides a phase measuring device, which can acquire a pulse signal obtained by detecting a convex tooth of a crankshaft by a crankshaft position sensor, determine an initial position of the crankshaft according to the pulse signal, and rotation speed information of an internal combustion engine connected with the crankshaft, and determine a crankshaft phase of the crankshaft between the initial position and a target position according to the number of strokes of the internal combustion engine which is experienced by the crankshaft from the initial position to the target position and the rotation speed information. Therefore, by adopting the method and the device of the embodiment of the application, a new low-level software equipment driving program is not required to be created, a large amount of code development and test work is avoided, the phase of the crankshaft can be accurately obtained, and the performance of the internal combustion engine is not influenced.
In addition, the embodiment of the application also provides a phase measurement device which is used for executing the phase measurement method.
The system mainly comprises a signal acquisition module, a filtering module, a bottom signal processing module, an FPGA layer calling module, a network port communication module, a top layer human-computer interaction module and upper computer software.
The signal acquisition module corresponds to an acquisition unit in the phase measurement device and is used for acquiring a pulse signal obtained by detecting a convex tooth of a crankshaft by a crankshaft position sensor;
the filtering module is used for carrying out integral filtering on the original pulse signal and rejecting positive and negative clutters with pulse widths lower than a set value so as to obtain a pulse signal based on the convex teeth of the crankshaft.
The bottom signal processing module is used for processing the pulse signals to enable the rotating speed of the internal combustion engine to be larger than the lowest stall rotating speed in the crankshaft measuring process, and the internal combustion engine is guaranteed to run in a stable working state.
The FPGA layer calling module corresponds to a first determining unit and a second determining unit in a phase measuring device and is used for determining the initial position of a crankshaft and the rotating speed information of an internal combustion engine connected with the crankshaft according to pulse signals; and determining a crankshaft phase of the crankshaft between the initial position and the target position based on the first duration of time the crankshaft has experienced from the initial position to the target position, the number of strokes of the internal combustion engine, and the speed information.
And the network port communication module is used for uploading the finally obtained crankshaft phase and camshaft phase to upper computer software or other controllers so as to display the measurement result to a user.
And the top layer human-computer interaction module is used for realizing human-computer interaction. The upper computer software can be deployed in an upper computer, and the measurement result can be visually displayed to a user.
The signal acquisition module comprises wiring harnesses from a crankshaft of the internal combustion engine, a camshaft position sensor to the signal acquisition equipment, and analog quantity acquisition equipment. The application of the device in the actual scene can be as follows:
1. hardware preparation. The crankshaft and camshaft position sensors of the internal combustion engine are respectively connected in different analog quantity acquisition channels of the signal acquisition equipment through wiring harnesses; the signal acquisition equipment is arranged on the bottom plate based on the FPGA; the bottom plate based on the FPGA is connected to an upper computer through a network port communication module.
2. And (4) preparing software. And opening upper computer software in an upper computer, initializing, compiling the FPGA program and downloading the FPGA program to the FPGA bottom plate. The model of a crankshaft signal panel is set and the lowest stall rotating speed is configured.
3. And (3) when the internal combustion engine is started and the real-time rotating speed of the internal combustion engine is determined to be greater than the lowest stall rotating speed set in the step (2), operating the upper computer software.
4. The filtering module processes the received crankshaft and camshaft signals, removes burrs in the signals, inputs the signals to the bottom signal processing module, judges whether the signals are lost or distorted, stops the machine if the signals are lost or distorted, rechecks the crankshaft and camshaft signal panel, and searches for the unique characteristic position of the crankshaft pulse signals according to the characteristics of the crankshaft signal panel and synchronizes the crankshaft pulse signals if the signals are normal.
5. And after synchronization is finished, the FPGA layer calling module outputs the rotating speed of the internal combustion engine and the real-time rotation angle positions of the crankshaft and the camshaft to upper computer software or other controllers.
6. And (5) after the test is finished, stopping the running of the internal combustion engine and stopping the running of the software.
It should be noted that, in the present specification, all the embodiments are described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus and system embodiments, since they are substantially similar to the method embodiments, they are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
The above description is only one specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method of phase measurement, the method comprising:
acquiring a pulse signal obtained by detecting a convex tooth of a crankshaft by a crankshaft position sensor;
determining an initial position of the crankshaft and rotation speed information of an internal combustion engine connected with the crankshaft according to the pulse signal;
determining a crankshaft phase of the crankshaft between an initial position and a target position based on a first duration of time the crankshaft has experienced from the initial position to the target position, a number of strokes of the internal combustion engine, and the rotational speed information.
2. The method of claim 1, wherein a crankshaft phase of the crankshaft between the initial position and the target position is determined using the following equation:
A＝(B*C*180°)/D；
wherein A is a crankshaft phase between the initial position and the target position;
b is a first time period that the crankshaft has experienced from an initial position to a target position;
c is the stroke number of one cycle of the internal combustion engine;
when C is 2, D is the time for the crankshaft to rotate one turn at the rotating speed;
when C is 4, D is the time that the crankshaft makes two revolutions at the rotational speed.
3. The method of claim 1, further comprising:
calculating the phase of a camshaft corresponding to the crankshaft according to the crankshaft phase; when the crankshaft is located at the initial position of the crankshaft, the camshaft is located at the initial position of the camshaft, and the crankshaft phase is twice the camshaft phase.
4. The method of claim 1, wherein determining rotational speed information of the crankshaft-coupled internal combustion engine from the pulse signal comprises:
determining the rotation speed of the crankshaft according to a second duration elapsed between rising edges of adjacent pulses in the pulse signal and the relative tooth number of the crankshaft; when the crankshaft is in a tooth-missing type, the relative tooth number is equal to the actual tooth number of the crankshaft plus the tooth-missing number of the crankshaft; when the crankshaft is in a dense-tooth type, the relative tooth number is equal to the actual tooth number of the crankshaft minus the dense tooth number of the crankshaft; when the crankshaft is of a uniform type, the relative number of teeth is equal to the actual number of teeth of the crankshaft;
and calculating the rotation speed of the internal combustion engine according to the rotation speed of the crankshaft.
5. The method of claim 4, wherein the second duration is determined according to the number of intervals of the synchronization mark between the rising edges of adjacent pulses of the pulse signal; the first time length is determined according to the number of intervals of the synchronous mark between the crankshaft from the initial position to the target position; the synchronization mark is continuously generated according to a preset period.
6. The method of claim 1, wherein said determining an initial position of said crankshaft from said pulse signal comprises:
identifying a unique characteristic of the crankshaft from the pulse signal;
and when the unique feature is located at a preset position and the camshaft meets a preset condition, setting the position of the unique feature as the initial position of the crankshaft.
7. A phase measurement device, characterized in that the device comprises:
the acquisition unit is used for acquiring a pulse signal obtained by detecting the convex teeth of the crankshaft by the crankshaft position sensor;
a first determination unit for determining an initial position of the crankshaft and rotational speed information of an internal combustion engine connected to the crankshaft based on the pulse signal;
a second determination unit configured to determine a crankshaft phase of the crankshaft between an initial position and a target position based on a first duration of time that the crankshaft has elapsed from the initial position to the target position, a number of strokes of the internal combustion engine, and the rotational speed information.
8. The apparatus of claim 7, wherein a crankshaft phase of the crankshaft between the initial position and the target position is determined using the following equation:
A＝(B*C*180°)/D；
wherein A is a crankshaft phase between the initial position and the target position;
b is a first time period that the crankshaft has experienced from an initial position to a target position;
c is the stroke number of one cycle of the internal combustion engine;
when C is 2, D is the time for the crankshaft to rotate one turn at the rotating speed;
when C is 4, D is the time that the crankshaft makes two revolutions at the rotational speed.
9. The apparatus of claim 7, further comprising:
the first calculating unit is used for calculating the phase of the camshaft corresponding to the crankshaft according to the phase of the crankshaft; when the crankshaft is located at the initial position of the crankshaft, the camshaft is located at the initial position of the camshaft, and the crankshaft phase is twice the camshaft phase.
10. The apparatus of claim 7, wherein the first determining unit comprises:
the first determining subunit is used for determining the rotating speed of the crankshaft according to a second time length elapsed between rising edges of adjacent pulses in the pulse signal and the relative tooth number of the crankshaft; when the crankshaft is in a tooth-missing type, the relative number of teeth is equal to the actual number of teeth of the crankshaft plus the number of teeth of the crankshaft; when the crankshaft is in a dense-tooth type, the relative tooth number is equal to the actual tooth number of the crankshaft minus the dense tooth number of the crankshaft; when the crankshaft is of a uniform type, the relative number of teeth is equal to the actual number of teeth of the crankshaft;
and the second calculation unit is used for calculating the rotation speed of the internal combustion engine according to the rotation speed of the crankshaft.
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|---|---|---|---|
| CN202110082490.4A CN114813149A (en) | 2021-01-21 | 2021-01-21 | Phase measurement method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110082490.4A CN114813149A (en) | 2021-01-21 | 2021-01-21 | Phase measurement method and device |
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| CN114813149A true CN114813149A (en) | 2022-07-29 |
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| CN202110082490.4A Pending CN114813149A (en) | 2021-01-21 | 2021-01-21 | Phase measurement method and device |
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| CN (1) | CN114813149A (en) |
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