CN110879149A - Engine timing test adjusting method and device - Google Patents
Engine timing test adjusting method and device Download PDFInfo
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- CN110879149A CN110879149A CN201911217678.4A CN201911217678A CN110879149A CN 110879149 A CN110879149 A CN 110879149A CN 201911217678 A CN201911217678 A CN 201911217678A CN 110879149 A CN110879149 A CN 110879149A
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Abstract
The invention discloses a method and a device for adjusting engine timing test, which are characterized in that engine data acquired by a data acquisition board card are acquired through test equipment, the engine data are analyzed, and an analysis result is output to a driving device; the driving device drives the engine oil control valve of the engine to be tested according to the analysis result and generates a driving duty ratio value; the engine oil control valve sends the driving duty ratio value to a phase shifter of an engine to be tested, so that the phase shifter sends target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism; the engine timing mechanism generates a target phase angle according to the target PWM duty ratio frequency; the engine timing mechanism adjusts the positions of a crankshaft and a camshaft of the engine to be tested according to the target phase angle, and can accurately and timely acquire dynamic data of each link during engine timing test; the stability and the responsiveness of the system can be intuitively and accurately reflected; and the secondary development can be carried out by changing in time according to the test requirement.
Description
Technical Field
The invention relates to the field of automobile engines, in particular to an engine timing test adjusting method and device.
Background
The Variable Valve Timing (VVT) technology of an engine is the most common technology applied to automobile engines in recent years, and the Variable Valve Timing technology of the engine can improve intake charge, increase charge coefficient, and further improve torque and power of the engine.
Therefore, it is important to determine whether the characteristics of the VVT system and the related components of the VVT system can meet the design requirements, and a reasonable test method is very important.
The existing technical scheme is that a VVT test bench is built, a motor is used for dragging the VVT test bench backwards, and the electrical performance of a VVT pressure regulating valve and the oil pressure characteristic of a phase shifter are tested; however, the existing scheme has the following disadvantages: only a single monomer function test is carried out, and the functional characteristic test evaluation of the complete VVT system cannot be carried out.
Disclosure of Invention
The invention mainly aims to provide an engine timing test adjusting method and device, and aims to solve the problem that in the prior art, only a single functional test cannot be carried out, and the functional characteristic test evaluation of a complete VVT system cannot be carried out.
In order to achieve the above object, the present invention provides an engine timing test adjusting method, including the steps of:
the test equipment acquires engine data acquired by the data acquisition board card, analyzes the engine data and outputs an analysis result to the driving device;
the driving device drives an engine oil control valve of the engine to be tested according to the analysis result and generates a driving duty ratio value;
the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism;
the engine timing mechanism generates a target phase angle according to a target PWM duty ratio frequency;
and the engine timing mechanism adjusts the positions of a crankshaft and a camshaft of the engine to be tested according to the target phase angle.
Preferably, after the engine timing mechanism adjusts the positions of the crankshaft and the camshaft of the engine to be tested according to the target phase angle, the engine timing test adjustment method further comprises:
and the data acquisition board card acquires the current engine data again until the current engine data meets the preset data, and the test is finished.
Preferably, after the engine timing mechanism generates the target phase angle according to the target PWM duty frequency, the engine timing test adjusting method further includes:
the engine dragging device drags the rotating speed of the engine to be tested to a preset rotating speed interval;
the coolant temperature control device controls the water temperature of the engine to be tested to be within a preset water temperature interval;
and the engine oil constant temperature control device controls the engine oil temperature of the engine to be tested within a preset oil temperature interval.
Preferably, the test equipment obtains the engine data that the data acquisition integrated circuit board was gathered to engine data carries out the analysis, output analysis result to drive arrangement, include:
the testing equipment acquires sensor signals acquired by a crankshaft position sensor and a camshaft position sensor on an engine to be tested through a data acquisition board card;
the test equipment obtains engine data according to the sensor signals;
the test equipment analyzes the engine data, generates an analysis result, and outputs the analysis result to a driving device.
Preferably, the test equipment obtains engine data from the sensor signals, including:
the test equipment obtains the falling edge time of the adjacent tooth signal from the sensor signal and the corresponding rotation angle of the falling edge time;
and the testing equipment obtains the engine speed of the engine to be tested according to the falling edge moment and the rotation angle.
Preferably, the test device obtains the engine speed of the engine to be tested according to the falling edge time and the rotation angle, and comprises:
the test equipment obtains a first falling time and a second falling time from the falling edge time;
the test equipment obtains the engine speed of the engine to be tested according to the rotation angle, the first descending moment and the second descending moment by using the following formula:
R＝(θ/360)/(T1+T2)
wherein R is the engine speed of the engine to be tested, theta is the rotation angle, T1 is a first descending moment and T2 is a second descending moment.
Preferably, the driving means drives an oil control valve of the engine to be tested according to the analysis result and generates a driving duty value, including:
the driving device obtains relative position parameters of a crankshaft and a camshaft on the engine to be tested during installation according to the analysis result;
the driving device obtains a first crankshaft tooth number corresponding to the rising edge of the first camshaft and a second crankshaft tooth number corresponding to the rising edge of the second camshaft according to the relative position parameter;
the driving device determines an initial phase angle according to the first crankshaft tooth number and the second crankshaft tooth number;
the driving device acquires a third crankshaft tooth number corresponding to a rising edge of a first camshaft from a preset first cylinder compression stop point after phase angle adjustment and a fourth crankshaft tooth number corresponding to a rising edge of a second camshaft;
the driving device obtains phase angle advanced tooth numbers according to the first crankshaft tooth number, the second crankshaft tooth number, the third crankshaft tooth number and the fourth crankshaft tooth number;
the driving device determines a current phase angle according to the phase angle lead tooth number and obtains a phase change angle according to the current phase angle and the initial phase angle;
and the driving device calculates and obtains the driving duty ratio value of the engine oil control valve of the engine to be tested according to the phase change angle.
Preferably, the engine oil control valve sends the driving duty value to a phase shifter of the engine to be tested so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism, and the method comprises the following steps:
the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter obtains a Pulse Width Modulation (PWM) duty ratio frequency corresponding to the driving duty ratio value;
the phase shifter is used for switching on and off an oil way according to the PWM duty ratio frequency adjustment, operating according to the adjusted oil way and recording operation data generated by operation;
the phase shifter obtains corresponding angle change parameters according to the operation data;
the phase shifter obtains a target change angle according to the angle change parameter, obtains a target driving duty ratio value according to the target change angle, and obtains a target PWM duty ratio frequency corresponding to the target driving duty ratio value;
and the phase shifter sends the target pulse width modulation PWM duty ratio frequency to the engine timing mechanism.
Preferably, the engine timing mechanism adjusts the positions of the crankshaft and the camshaft of the engine to be tested according to the target phase angle, and comprises:
the engine timing mechanism adjusts the positions of a crankshaft and a camshaft of the engine to be tested according to the target phase angle, and acquires the current engine data again through the data acquisition board card;
the engine timing mechanism acquires the crank angle opening angle of the engine to be tested from the current engine data;
acquiring a preset opening angle from preset data of the engine timing mechanism, and comparing the crank angle opening angle with the preset opening angle;
and when the crank angle opening angle of the engine timing mechanism is greater than the preset opening angle, adjusting the PID parameter according to a preset calibration parameter until the current engine data meets the preset data, and ending the test.
In order to achieve the above object, the present invention provides an engine timing test adjustment device, including: the system comprises a test device, a data acquisition board card, a driving device, an engine oil control valve, a phase shifter, an engine timing mechanism, an engine back-and-forth device, a cooling liquid temperature control device and an engine oil constant temperature control device;
the test equipment is used for acquiring the engine data acquired by the data acquisition board card, analyzing the engine data and outputting an analysis result to the driving device;
the driving device is used for driving the engine oil control valve of the engine to be tested according to the analysis result and generating a driving duty ratio value;
the engine oil control valve is used for sending the driving duty ratio value to a phase shifter of the engine to be tested so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism;
the engine timing mechanism is used for generating a target phase angle according to a target PWM duty ratio frequency;
the engine dragging-backward device is used for dragging the rotating speed of the engine to be tested to a preset rotating speed interval;
the cooling liquid temperature control device is used for controlling the water temperature of the engine to be tested within a preset water temperature interval;
the engine oil constant temperature control device is used for controlling the engine oil temperature of the engine to be tested within a preset oil temperature interval;
the engine timing mechanism is further used for adjusting the positions of a crankshaft and a camshaft of the engine to be tested according to the target phase angle.
The engine timing test adjusting method provided by the invention comprises the steps of obtaining engine data collected by a data collection board card through test equipment, analyzing the engine data, and outputting an analysis result to a driving device; the driving device drives an engine oil control valve of the engine to be tested according to the analysis result and generates a driving duty ratio value; the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism; the engine timing mechanism generates a target phase angle according to a target PWM duty ratio frequency; the engine timing mechanism adjusts the positions of the crankshaft and the camshaft of the engine to be tested according to the target phase angle, can accurately and timely acquire dynamic data of each link during engine timing test, performs complete engine timing test evaluation, can intuitively and accurately reflect the stability and the responsiveness of the system, and can timely change according to test requirements to perform secondary development.
Drawings
FIG. 1 is a schematic flow chart diagram of a first embodiment of an engine timing test adjustment method of the present invention;
FIG. 2 is a schematic flow chart of a second embodiment of the engine timing test adjustment method of the present invention;
FIG. 3 is a schematic flow chart of a third embodiment of the engine timing test adjustment method of the present invention;
FIG. 4 is a functional block diagram of a first embodiment of an engine timing test adjustment apparatus of the present invention. .
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The solution of the embodiment of the invention is mainly as follows: the engine data acquired by the data acquisition board card are acquired by the test equipment, the engine data are analyzed, and an analysis result is output to the driving device; the driving device drives an engine oil control valve of the engine to be tested according to the analysis result and generates a driving duty ratio value; the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism; the engine timing mechanism generates a target phase angle according to a target PWM duty ratio frequency; the engine timing mechanism adjusts the positions of the crankshaft and the camshaft of the engine to be tested according to the target phase angle, can accurately and timely acquire dynamic data of each link during engine timing test, performs complete engine timing test evaluation, can intuitively and accurately reflect the stability and the responsiveness of the system, can timely change according to test requirements to perform secondary development, and solves the technical problems that only a single functional test cannot be performed and complete VVT system functional characteristic test evaluation cannot be performed in the prior art.
Referring to fig. 1, fig. 1 is a schematic flow chart of a first embodiment of an engine timing test adjusting method according to the present invention.
In a first embodiment, the engine timing test adjustment method includes the steps of:
and S10, the test equipment acquires the engine data acquired by the data acquisition board card, analyzes the engine data and outputs an analysis result to the driving device.
It should be noted that the test equipment can analyze the engine data through the engine data acquired by the data acquisition board card, and output an analysis result to the driving device; in actual operation, the test equipment includes an upper computer, the upper computer is connected to a computer equipped with a real-time operating system, such as CompactRIO of NI corporation, the upper computer includes a real-time processor and an FPGA, and supports downloading of a VVT control algorithm program and performing online calibration, and the computer of the real-time operating system is equipped with a data acquisition board and a Pulse Width Modulation (PWM) duty cycle driving module.
And step S20, the driving device drives the engine oil control valve of the engine to be tested according to the analysis result and generates a driving duty ratio value.
It can be understood that the driving device can determine to generate different driving commands according to the analysis result, and accordingly adjusts and controls the engine oil control valve driving the engine to be tested to generate the corresponding driving duty ratio value.
And step S30, the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter sends the target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism.
It should be appreciated that after obtaining the drive duty cycle value, the drive duty cycle value may be sent to the phase shifter of the engine under test, causing the phase shifter to generate a corresponding target Pulse Width Modulation (PWM) duty cycle frequency, which in turn causes the phase shifter to send the target PWM duty cycle frequency to the engine timing mechanism.
Step S40, the engine timing mechanism generates a target phase angle according to a target PWM duty cycle frequency.
It is understood that the engine timing mechanism adjusts the current angle, i.e., the current angle of the engine timing mechanism, to the set target angle according to the target PWM duty frequency.
It should be understood that after the step S40, the engine timing test adjusting method further includes the steps of:
the engine dragging device drags the rotating speed of the engine to be tested to a preset rotating speed interval;
the coolant temperature control device controls the water temperature of the engine to be tested to be within a preset water temperature interval;
and the engine oil constant temperature control device controls the engine oil temperature of the engine to be tested within a preset oil temperature interval.
It should be noted that the preset rotation speed interval is a preset rotation speed interval, and the rotation speed of the engine to be tested is dragged to the preset rotation speed interval through the engine dragging device, that is, the engine dragging device can drag any rotation speed of the engine in a reasonable rotation speed interval; the coolant temperature control device controls the water temperature of the engine to be tested within a preset water temperature range, namely the coolant temperature control device is connected with an engine cooling system; the engine oil constant temperature control device controls the engine oil temperature of the engine to be tested in a preset oil temperature interval, namely the engine oil constant temperature control device is connected with an engine lubricating system, and the water temperature and the engine oil temperature required by testing are guaranteed.
And step S50, the engine timing mechanism adjusts the positions of the crankshaft and the camshaft of the engine to be tested according to the target phase angle.
It will be appreciated that the positions of the crankshaft and camshaft of the engine under test may be adjusted according to the target phase angle, thereby adjusting the engine timing test to a more accurate degree, improving engine timing test stability and responsiveness.
Further, the step S50 further includes the following steps:
and the data acquisition board card acquires the current engine data again until the current engine data meets the preset data, and the test is finished.
It can be understood that the test result can be determined to meet the preset data by circularly collecting new engine data, and the engine can be in an optimal working state, so that the positive adjustment effect of the engine timing test is ensured, and the integrity and the stability of the engine timing test are further improved.
According to the scheme, the engine data acquired by the data acquisition board card is acquired through the test equipment, the engine data is analyzed, and an analysis result is output to the driving device; the driving device drives an engine oil control valve of the engine to be tested according to the analysis result and generates a driving duty ratio value; the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism; the engine timing mechanism generates a target phase angle according to a target PWM duty ratio frequency; the engine timing mechanism adjusts the positions of the crankshaft and the camshaft of the engine to be tested according to the target phase angle, can accurately and timely acquire dynamic data of each link during engine timing test, performs complete engine timing test evaluation, can intuitively and accurately reflect the stability and the responsiveness of the system, and can timely change according to test requirements to perform secondary development.
Further, fig. 2 is a schematic flowchart of a second embodiment of the engine timing test adjusting method according to the present invention, and as shown in fig. 2, the second embodiment of the engine timing test adjusting method according to the present invention is proposed based on the first embodiment, in this embodiment, the step S10 specifically includes the following steps:
and step S11, the testing equipment acquires a data acquisition board card and acquires sensor signals acquired by a crankshaft position sensor and a camshaft position sensor on the engine to be tested.
It should be noted that sensors are pre-installed at the crankshaft position and the camshaft position on the engine to be tested, and are used for acquiring corresponding sensor data, namely sensor signals, through a data acquisition board card; in actual operation, generally, the data acquisition board card is connected with a crankshaft position sensor and a camshaft position sensor on the engine, and the crankshaft position sensor and the camshaft position sensor acquire sensor signals from an engine timing mechanism.
And step S12, the test equipment obtains engine data according to the sensor signals.
It will be appreciated that the test equipment will generate corresponding engine data for driving the engine from the sensor signals.
Further, the step S12 specifically includes the following steps:
the test equipment obtains the falling edge time of the adjacent tooth signal from the sensor signal and the corresponding rotation angle of the falling edge time;
and the testing equipment obtains the engine speed of the engine to be tested according to the falling edge moment and the rotation angle.
In the specific implementation, sensor signals acquired by a crankshaft position sensor and a camshaft position sensor on an engine to be tested are generally acquired through a data acquisition board card, and the rotating speed of the engine is calculated according to two falling edge moments of adjacent tooth signals of two cursors in the sensor signals and rotating angles corresponding to the two falling edge moments.
Further, the step of obtaining the engine speed of the engine to be tested according to the falling edge moment and the rotation angle by the testing equipment comprises the following steps of:
the test equipment obtains a first falling time and a second falling time from the falling edge time;
the test equipment obtains the engine speed of the engine to be tested according to the rotation angle, the first descending moment and the second descending moment by using the following formula:
R＝(θ/360)/(T1+T2)
wherein R is the engine speed of the engine to be tested, theta is the rotation angle, T1 is a first descending moment and T2 is a second descending moment.
It should be noted that the falling edge time of the adjacent tooth signal is T1 and T2, the corresponding rotation angle of the falling edge of the adjacent tooth is θ, the engine speed can be calculated by the above formula, and of course, the engine speed can also be calculated by other preset formulas or relational expressions, which is not limited in this embodiment.
And step S13, the test equipment analyzes the engine data, generates an analysis result and outputs the analysis result to a driving device.
It should be understood that the engine data may be analyzed by the testing device, and then an analysis result corresponding to the engine data may be obtained, generally, a corresponding driving opening angle is generated as an analysis result and sent to the driving device, and of course, other analysis results may also be sent to the driving device, which is not limited in this embodiment.
According to the scheme, the data acquisition board card is acquired through the testing equipment to acquire sensor signals acquired by a crankshaft position sensor and a camshaft position sensor on the engine to be tested; the test equipment obtains engine data according to the sensor signals; the test equipment analyzes the engine data to generate an analysis result, and outputs the analysis result to the driving device, so that the relevant data of the engine can be accurately collected in real time, the dynamic data of each link during the engine timing test can be accurately and timely obtained, the complete engine timing test evaluation can be carried out, the stability and the responsiveness of the system can be intuitively and accurately reflected, and the secondary development can be carried out by timely changing according to the test requirement.
Further, fig. 3 is a schematic flowchart of a third embodiment of the engine timing test adjusting method according to the present invention, and as shown in fig. 3, the third embodiment of the engine timing test adjusting method according to the present invention is proposed based on the second embodiment, in this embodiment, the step S20 specifically includes the following steps:
and step S21, the driving device obtains the relative position parameters of the crankshaft and the camshaft on the engine to be tested during installation according to the analysis result.
It should be noted that the relative position parameter is data corresponding to the relative position of the crankshaft and the camshaft that are pre-installed on the engine to be tested, and the relative position parameter can be obtained from the analysis result through the driving device, so as to prepare for the subsequent generation of the driving duty ratio.
And step S22, the driving device obtains a first crankshaft tooth number corresponding to the rising edge of the first camshaft and a second crankshaft tooth number corresponding to the rising edge of the second camshaft according to the relative position parameter.
It should be understood that the number of crankshaft teeth corresponding to the rising edge of the camshaft can be obtained through the relative position parameter, that is, a first number of crankshaft teeth corresponding to the rising edge of the first camshaft and a second number of crankshaft teeth corresponding to the rising edge of the second camshaft are obtained according to the relative position parameter,
and step S23, the driving device determines an initial phase angle according to the first crankshaft tooth number and the second crankshaft tooth number.
It should be understood that, in practical operation, generally, according to the relative position parameters when the engine crankshaft and the camshaft are installed, when the system recognizes that the rising edge of the first camshaft corresponds to the crankshaft being m 1-15.16 teeth and the rising edge of the second camshaft corresponds to the crankshaft being m 2-28.5 teeth, the system is defined as system synchronization, and the camshaft angle marking this state is 0 degree, that is, the initial phase angle is 0 degree, and may be set as other teeth of the corresponding crankshaft, which is not limited in this embodiment.
And step S24, the driving device acquires a third crankshaft tooth number corresponding to a first camshaft rising edge and a fourth crankshaft tooth number corresponding to a second camshaft rising edge after the phase angle is adjusted from a preset first cylinder compression stop point.
It should be noted that the preset first cylinder compression dead center is a preset first cylinder compression dead center of the engine, and a third crankshaft tooth number corresponding to a rising edge of the first camshaft and a fourth crankshaft tooth number corresponding to a rising edge of the second camshaft are used; in practical operation, the camshaft signal corresponding to the missing teeth of two adjacent crankshafts generally changes from low to high, and m & lt20 & gt teeth after the current first missing tooth is defined as the compression top dead center of the first cylinder.
And step S25, the driving device obtains phase angle advance tooth numbers according to the first crankshaft tooth number, the second crankshaft tooth number, the third crankshaft tooth number and the fourth crankshaft tooth number.
It is to be understood that the phase angle advance tooth number may be obtained from the first crankshaft tooth number, the second crankshaft tooth number, the third crankshaft tooth number, and the fourth crankshaft tooth number; in actual operation, before and after phase angle adjustment, the number of crankshaft teeth corresponding to a first cylinder of the engine, namely the first cylinder from the end position of a flywheel, a corresponding first camshaft rising edge and a corresponding second camshaft rising edge are respectively recorded; according to the formed initial camshaft waveform and the waveform after phase shifting, the corresponding crankshaft tooth number m1 'corresponding to the rising edge of the first camshaft and the crankshaft tooth number m 2' corresponding to the rising edge of the second camshaft can be obtained, the first crankshaft tooth number m1 and the second crankshaft tooth number m2 are combined, and the average value of the difference values of the crankshaft teeth corresponding to the two waveforms is used for obtaining the tooth number with the phase angle advanced, namely the tooth number with the phase angle advanced is obtained
Δm＝[(m2’-m2)+(m1’-m1)]/2
And step S26, the driving device determines a current phase angle according to the phase angle lead tooth number and obtains a phase change angle according to the current phase angle and the initial phase angle.
It should be understood that by converting the phase angle advance tooth number into a current phase angle Δ θ ═ Δ m × 6 °, i.e., a change in phase angle, a phase change angle can be obtained from the current phase angle and the initial phase angle.
And step S27, the driving device calculates and obtains the driving duty ratio value of the engine oil control valve of the engine to be tested according to the phase change angle.
It can be understood that the engine oil control valve driving duty value of the engine to be tested can be obtained through calculation according to the phase change angle, a target angle a is set in actual operation, and the target angle a 'is combined with the current angle a' and input into a VVT closed loop PID demodulator model, so that a reference OCV valve driving duty value d is obtained through calculation.
Correspondingly, the step S30 specifically includes the following steps:
the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter obtains a Pulse Width Modulation (PWM) duty ratio frequency corresponding to the driving duty ratio value;
the phase shifter is used for switching on and off an oil way according to the PWM duty ratio frequency adjustment, operating according to the adjusted oil way and recording operation data generated by operation;
the phase shifter obtains corresponding angle change parameters according to the operation data;
the phase shifter obtains a target change angle according to the angle change parameter, obtains a target driving duty ratio value according to the target change angle, and obtains a target PWM duty ratio frequency corresponding to the target driving duty ratio value;
and the phase shifter sends the target pulse width modulation PWM duty ratio frequency to the engine timing mechanism.
In the specific implementation, the real-time operating system computer sends a PWM duty ratio signal to the PWM duty ratio driving module according to set parameters, the driving duty ratio module is connected with an OCV valve electric plug on an engine, the action of the OCV valve is driven to adjust the on-off of an oil way, the engine oil flow controls the VCP shifter to work, and the action of the VCP shifter changes the angle of the timing system. And inputting the updated angle into a VVT closed loop Proportional Integral Derivative (PID) demodulator model again, calculating to obtain a new reference OCV valve driving duty ratio, and setting the PWM duty ratio frequency until the PWM duty ratio frequency is adjusted to the set target angle.
Correspondingly, the step S50 specifically includes the following steps:
the engine timing mechanism adjusts the positions of a crankshaft and a camshaft of the engine to be tested according to the target phase angle, and acquires the current engine data again through the data acquisition board card;
the engine timing mechanism acquires the crank angle opening angle of the engine to be tested from the current engine data;
acquiring a preset opening angle from preset data of the engine timing mechanism, and comparing the crank angle opening angle with the preset opening angle;
and when the crank angle opening angle of the engine timing mechanism is greater than the preset opening angle, adjusting the PID parameter according to a preset calibration parameter until the current engine data meets the preset data, and ending the test.
It can be understood that the data acquisition board card is used for acquiring the current engine data again; the engine timing mechanism acquires the crank angle opening angle of the engine to be tested from the current engine data; acquiring a preset opening angle from preset data of the engine timing mechanism, and comparing the crank angle opening angle with the preset opening angle; when the crank angle opening angle of the engine timing mechanism is larger than the preset opening angle, the PID parameter is adjusted according to the preset calibration parameter, and the test can be finished when the preset data is met.
In the specific implementation, the measurement and control system processor device records an initial angle 0CrA (crank angle) of the VVT at the beginning, the driving duty ratio is 0, the VVT system is defined as a locked state at this time, the system times for 4s, then the measurement and control system processor device gives a driving opening signal of 100%, the driven VVT angle is recorded as MaxVVT, the maximum opening lasts for 4s, then the measurement and control system processor device gives a driving opening signal of 0, and the steps are circulated for 50 times. If the unlocking failure condition occurs in the process from the initial opening degree to the maximum opening degree and then to the minimum opening degree, the unlocking failure is considered to occur, namely the actual angle after the driving is supposed to be MaxVVT but is actually measured to be 0. At this time, when the oil pressure is normal, it is necessary to check whether or not there is a quality problem with the VVT mechanism components.
In a specific implementation, the engine speed in the working condition of the test may correspond to 800, 1000, 1100, 1200, 1300, 1400, 1500, 2000, 3000, and the like, and may also correspond to other speed values, which is not limited in this embodiment; the main oil gallery temperature in the tested working condition may be 40, 70, 100, etc., and may also correspond to other oil pressures, which is not limited in this embodiment; if the constant value of the engine oil temperature under the rated working condition of the engine is more than or equal to 120 ℃, the maximum temperature value is set to 120 ℃, and if the constant value of the engine oil temperature under the rated working condition of the engine is less than 120 ℃, the maximum temperature value is the engine oil temperature value under the rated working condition, and can be set to be not less than 105 ℃.
It should be understood that if the actual value of the response time at which the VVT overshoot occurs is greater than the target value, then an overshoot phenomenon is deemed to have occurred; the opening angle of the VVT system is possibly larger than that of a VVT design target, so that the VVT opening instantaneously exceeds the target angle in the adjusting process and quickly falls back to the control target; reducing VVT response speed during overshoot, and taking the moment of falling back to the first 3 degrees of the control target value as the standard for the cut-off time in response speed calculation; at the moment, the measurement and control system processor equipment adjusts the calibration parameters of the PID demodulator model at the VVT position, and then the test process is repeated to monitor the overshoot phenomenon, so that the control precision that the difference between the overshoot fluctuation value and the target value is less than or equal to +/-2.5 CrA is required to be met; in the first cycle of the above operation, the time Δ T required for the intake VVT to be adjusted from C1 to C2 is extracted, and then the adjustment speed ω 1 at which the VVT of that cycle is adjusted forward is calculated; finally, the average of 10 cycles is taken for calculation, namely:
the test result needs to meet the conditions that the oil temperature is 100 ℃ at 1000r/min and the speed is more than or equal to 50 CrA/s; 1500r/min @ oil temperature is 100 ℃, and the speed is regulated to be more than or equal to 100 CrA/s; an Electronic Control Unit (ECU) controls the target rotating speed of an engine to be 1500r/min, the temperature of a main oil duct is set to be 40 ℃, 70 ℃, 100 ℃ and Tmaxoil in sequence, measurement and Control system equipment sets a VVT initial angle of 5CrA, a step length angle is set to be delta a which is 5CrA, 4s is increased once until the range of MaxVVT-5CrA, and then the initial angle is gradually adjusted back according to the step length and the period, and the operation is circulated for 10 times; and comparing the difference between the recorded actual VVT angle and the set target VVT angle to obtain a phase difference, calculating the phase change speed by the step angle delta a being 5CrA and the time delta t, and finding out the maximum phase speed omega being delta a/delta t, wherein the maximum phase speed needs to meet the requirement of being less than or equal to 6CrA, so that an accurate test result can be obtained, and the stability and the responsiveness of the system can be intuitively and accurately reflected.
According to the scheme, the ROI of the region of interest is divided in the vehicle body radar coverage area corresponding to the non-repetitive obstacle information through the preset dividing rule, the dividing result is obtained, accuracy of the radar monitoring result information can be further improved, the fact that other running vehicles influence automatic driving is avoided, the ROI of a plurality of targets in a large range can be divided, the sensing result is optimized, powerful guarantee is provided for safe running and comprehensive sensing of the automatic driving vehicles, and safety of passengers is guaranteed.
The invention further provides an engine timing test adjusting device.
Referring to fig. 4, fig. 4 is a functional block diagram of a first embodiment of the engine timing test adjusting device of the present invention.
In a first embodiment of the engine timing test adjustment apparatus of the present invention, the engine timing test adjustment apparatus includes:
the test equipment 10 is configured to acquire the engine data acquired by the data acquisition board, analyze the engine data, and output an analysis result to the driving device.
It should be noted that the test equipment can analyze the engine data through the engine data acquired by the data acquisition board card, and output an analysis result to the driving device; in actual operation, the test equipment includes an upper computer, the upper computer is connected to a computer equipped with a real-time operating system, such as CompactRIO of NI corporation, the upper computer includes a real-time processor and an FPGA, and supports downloading of a VVT control algorithm program and performing online calibration, and the computer of the real-time operating system is equipped with a data acquisition board and a Pulse Width Modulation (PWM) duty cycle driving module.
And the driving device 20 is used for driving the engine oil control valve of the engine to be tested according to the analysis result and generating a driving duty ratio value.
It can be understood that the driving device can determine to generate different driving commands according to the analysis result, and accordingly adjusts and controls the engine oil control valve driving the engine to be tested to generate the corresponding driving duty ratio value.
The engine oil control valve 30 is configured to send the driving duty value to the phase shifter of the engine to be tested, so that the phase shifter sends the target PWM duty frequency to the engine timing mechanism.
It should be appreciated that after obtaining the drive duty cycle value, the drive duty cycle value may be sent to the phase shifter of the engine under test, causing the phase shifter to generate a corresponding target Pulse Width Modulation (PWM) duty cycle frequency, which in turn causes the phase shifter to send the target PWM duty cycle frequency to the engine timing mechanism.
The engine timing mechanism 40 is configured to generate a target phase angle according to a target PWM duty cycle frequency.
It is understood that the engine timing mechanism adjusts the current angle, i.e., the current angle of the engine timing mechanism, to the set target angle according to the target PWM duty frequency.
The engine dragging-backward device 50 is used for dragging the rotating speed of the engine to be tested to a preset rotating speed interval.
And the cooling liquid temperature control device 60 is used for controlling the water temperature of the engine to be tested within a preset water temperature interval.
The engine oil constant temperature control device 70 is used for controlling the engine oil temperature of the engine to be tested within a preset oil temperature interval.
It should be noted that the preset rotation speed interval is a preset rotation speed interval, and the rotation speed of the engine to be tested is dragged to the preset rotation speed interval through the engine dragging device, that is, the engine dragging device can drag any rotation speed of the engine in a reasonable rotation speed interval; the coolant temperature control device controls the water temperature of the engine to be tested within a preset water temperature range, namely the coolant temperature control device is connected with an engine cooling system; the engine oil constant temperature control device controls the engine oil temperature of the engine to be tested in a preset oil temperature interval, namely the engine oil constant temperature control device is connected with an engine lubricating system, and the water temperature and the engine oil temperature required by testing are guaranteed.
The engine timing mechanism 80 is further configured to adjust the positions of the crankshaft and the camshaft of the engine to be tested according to the target phase angle.
It will be appreciated that the positions of the crankshaft and camshaft of the engine under test may be adjusted according to the target phase angle, thereby adjusting the engine timing test to a more accurate degree, improving engine timing test stability and responsiveness.
According to the scheme, the engine data acquired by the data acquisition board card is acquired through the test equipment, the engine data is analyzed, and an analysis result is output to the driving device; the driving device drives an engine oil control valve of the engine to be tested according to the analysis result and generates a driving duty ratio value; the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism; the engine timing mechanism generates a target phase angle according to a target PWM duty ratio frequency; the engine timing mechanism adjusts the positions of the crankshaft and the camshaft of the engine to be tested according to the target phase angle, can accurately and timely acquire dynamic data of each link during engine timing test, performs complete engine timing test evaluation, can intuitively and accurately reflect the stability and the responsiveness of the system, and can timely change according to test requirements to perform secondary development.
Other embodiments or specific implementation manners of the engine timing test adjusting device according to the present invention may refer to the above method embodiments, and are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or other apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or other apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or article that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An engine timing test adjustment method, characterized by comprising:
the test equipment acquires engine data acquired by the data acquisition board card, analyzes the engine data and outputs an analysis result to the driving device;
the driving device drives an engine oil control valve of the engine to be tested according to the analysis result and generates a driving duty ratio value;
the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism;
the engine timing mechanism generates a target phase angle according to a target PWM duty ratio frequency;
and the engine timing mechanism adjusts the positions of a crankshaft and a camshaft of the engine to be tested according to the target phase angle.
2. The engine timing test adjustment method of claim 1, wherein the data acquisition board reacquires current engine data until the test is terminated when the current engine data meets preset data.
3. The engine timing test adjustment method of claim 2, after the engine timing mechanism generates the target phase angle according to the target PWM duty cycle frequency, the engine timing test adjustment method further comprising:
the engine dragging device drags the rotating speed of the engine to be tested to a preset rotating speed interval;
the coolant temperature control device controls the water temperature of the engine to be tested to be within a preset water temperature interval;
and the engine oil constant temperature control device controls the engine oil temperature of the engine to be tested within a preset oil temperature interval.
4. The engine timing test adjustment method of claim 3, wherein the test equipment acquires engine data acquired by a data acquisition board, analyzes the engine data, and outputs an analysis result to a drive device, and comprises:
the testing equipment acquires sensor signals acquired by a crankshaft position sensor and a camshaft position sensor on an engine to be tested through a data acquisition board card;
the test equipment obtains engine data according to the sensor signals;
the test equipment analyzes the engine data, generates an analysis result, and outputs the analysis result to a driving device.
5. The engine timing test adjustment method of claim 4, wherein the test equipment obtaining engine data from the sensor signal comprises:
the test equipment obtains the falling edge time of the adjacent tooth signal from the sensor signal and the corresponding rotation angle of the falling edge time;
and the testing equipment obtains the engine speed of the engine to be tested according to the falling edge moment and the rotation angle.
6. The engine timing test adjustment method of claim 5, wherein the test equipment obtains the engine speed of the engine to be tested according to the falling edge time and the rotation angle, and comprises the following steps:
the test equipment obtains a first falling time and a second falling time from the falling edge time;
the test equipment obtains the engine speed of the engine to be tested according to the rotation angle, the first descending moment and the second descending moment by using the following formula:
R＝(θ/360)/(T1+T2)
wherein R is the engine speed of the engine to be tested, theta is the rotation angle, T1 is a first descending moment and T2 is a second descending moment.
7. The engine timing test adjustment method as set forth in claim 6, wherein the driving means drives an oil control valve of the engine to be tested according to the analysis result and generates a driving duty value, including:
the driving device obtains relative position parameters of a crankshaft and a camshaft on the engine to be tested during installation according to the analysis result;
the driving device obtains a first crankshaft tooth number corresponding to the rising edge of the first camshaft and a second crankshaft tooth number corresponding to the rising edge of the second camshaft according to the relative position parameter;
the driving device determines an initial phase angle according to the first crankshaft tooth number and the second crankshaft tooth number;
the driving device acquires a third crankshaft tooth number corresponding to a rising edge of a first camshaft from a preset first cylinder compression stop point after phase angle adjustment and a fourth crankshaft tooth number corresponding to a rising edge of a second camshaft;
the driving device obtains phase angle advanced tooth numbers according to the first crankshaft tooth number, the second crankshaft tooth number, the third crankshaft tooth number and the fourth crankshaft tooth number;
the driving device determines a current phase angle according to the phase angle lead tooth number and obtains a phase change angle according to the current phase angle and the initial phase angle;
and the driving device calculates and obtains the driving duty ratio value of the engine oil control valve of the engine to be tested according to the phase change angle.
8. The engine timing test adjustment method of claim 7, wherein the oil control valve sending the drive duty cycle value to a phase shifter of the engine under test to cause the phase shifter to send a target Pulse Width Modulation (PWM) duty cycle frequency to an engine timing mechanism, comprising:
the engine oil control valve sends the driving duty ratio value to a phase shifter of the engine to be tested, so that the phase shifter obtains a Pulse Width Modulation (PWM) duty ratio frequency corresponding to the driving duty ratio value;
the phase shifter is used for switching on and off an oil way according to the PWM duty ratio frequency adjustment, operating according to the adjusted oil way and recording operation data generated by operation;
the phase shifter obtains corresponding angle change parameters according to the operation data;
the phase shifter obtains a target change angle according to the angle change parameter, obtains a target driving duty ratio value according to the target change angle, and obtains a target PWM duty ratio frequency corresponding to the target driving duty ratio value;
and the phase shifter sends the target pulse width modulation PWM duty ratio frequency to the engine timing mechanism.
9. The engine timing test adjustment method of claim 8, wherein the engine timing mechanism adjusting the position of the crankshaft and camshaft of the engine under test according to the target phase angle comprises:
the engine timing mechanism adjusts the positions of a crankshaft and a camshaft of the engine to be tested according to the target phase angle, and acquires the current engine data again through the data acquisition board card;
the engine timing mechanism acquires the crank angle opening angle of the engine to be tested from the current engine data;
acquiring a preset opening angle from preset data of the engine timing mechanism, and comparing the crank angle opening angle with the preset opening angle;
and when the crank angle opening angle of the engine timing mechanism is greater than the preset opening angle, adjusting the PID parameter according to a preset calibration parameter until the current engine data meets the preset data, and ending the test.
10. An engine timing test adjustment device, characterized in that the engine timing test adjustment device comprises: the system comprises a test device, a data acquisition board card, a driving device, an engine oil control valve, a phase shifter, an engine timing mechanism, an engine back-and-forth device, a cooling liquid temperature control device and an engine oil constant temperature control device;
the test equipment is used for acquiring the engine data acquired by the data acquisition board card, analyzing the engine data and outputting an analysis result to the driving device;
the driving device is used for driving the engine oil control valve of the engine to be tested according to the analysis result and generating a driving duty ratio value;
the engine oil control valve is used for sending the driving duty ratio value to a phase shifter of the engine to be tested so that the phase shifter sends a target Pulse Width Modulation (PWM) duty ratio frequency to an engine timing mechanism;
the engine timing mechanism is used for generating a target phase angle according to a target PWM duty ratio frequency;
the engine dragging-backward device is used for dragging the rotating speed of the engine to be tested to a preset rotating speed interval;
the cooling liquid temperature control device is used for controlling the water temperature of the engine to be tested within a preset water temperature interval;
the engine oil constant temperature control device is used for controlling the engine oil temperature of the engine to be tested within a preset oil temperature interval;
the engine timing mechanism is further used for adjusting the positions of a crankshaft and a camshaft of the engine to be tested according to the target phase angle.
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