CN111828221B - Reliability testing device and measuring method for oil inlet metering valve of common rail pump - Google Patents
Reliability testing device and measuring method for oil inlet metering valve of common rail pump Download PDFInfo
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- CN111828221B CN111828221B CN202010685949.5A CN202010685949A CN111828221B CN 111828221 B CN111828221 B CN 111828221B CN 202010685949 A CN202010685949 A CN 202010685949A CN 111828221 B CN111828221 B CN 111828221B
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- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
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Abstract
The invention discloses a reliability testing device and a measuring method for an oil inlet metering valve of a common rail pump, which comprise two sets of oil supply systems; each set of oil supply system is as follows: the gear type oil pump absorbs oil from the first oil tank T1 and is respectively sent to the inlets of eight oil inlet metering valves after being filtered, and the outlets of the oil inlet metering valves are provided with electric reversing valves. The reliability testing device and the testing method for the oil inlet metering valves of the common rail pump can realize the simultaneous testing of 16 oil inlet metering valves, greatly reduce the requirements on an oil supply system by adjusting the phase difference of PWM signals, and save a large amount of pipeline connection by respectively installing the 16 oil inlet metering valves on two integrated valve blocks, so that the whole testing device has a compact structure and is convenient to maintain. The reliability testing device for the oil inlet metering valves of the common rail pump can be used for performing sine flutter testing and switch testing under fixed oil inlet pressure and oil outlet pressure, acceleration reliability testing under the condition of no oil supply and flow testing of each oil inlet metering valve under the fixed oil inlet pressure and the oil outlet pressure.
Description
Technical Field
The invention belongs to the technical field of common rail pumps, and particularly relates to a reliability testing device and a measuring method for an oil inlet metering valve of a common rail pump.
Background
The common rail pump is an important component of an electronic control high-pressure common rail fuel injection system and generally comprises a low-pressure fuel delivery pump, an oil inlet metering valve and a high-pressure pump. The ECU adjusts the flow rate of the low-pressure oil delivery pump conveyed to the high-pressure pump by controlling the oil inlet metering valve so as to adjust the oil output of the common rail pump, and the ECU adapts to the adjustment of the oil supply under different operating conditions. Therefore, the reliability of the oil inlet metering valve has a crucial influence on the operation of the electric control high-pressure common rail fuel injection system and even the whole engine, and the reliability test is required in the development and mass production stages of the oil inlet metering valve. At present, a mature scheme for solving the reliability test problem of the oil inlet metering valve does not exist.
Disclosure of Invention
The invention aims to provide a device and a method for testing the reliability of an oil inlet metering valve of a common rail pump, and solves the technical problem that the reliability of the oil inlet metering valve is difficult to test in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the reliability testing device for the oil inlet metering valve of the common rail pump comprises a first oil tank T1 filled with calibration oil, a second oil tank T2 and two oil supply systems;
the gear type oil pump sucks oil from the second oil tank T2, and the oil is sent to a first oil tank T1 through a first coarse filter, a first fine filter and a first heat exchanger in sequence, and a liquid level meter and a first temperature sensor are arranged in the first oil tank T1;
each set of oil supply system comprises: the gear type oil pump absorbs oil from a first oil tank T2 and respectively sends the oil to eight oil inlet metering valve inlets through a second coarse filter and a second fine filter; the outlet pressure of the gear type oil pump is regulated by a first overflow valve and is stabilized by an energy accumulator; measuring the oil outlet pressure of the outlet of the gear type oil pump through a first pressure sensor, and measuring the oil outlet temperature of the outlet of the gear type oil pump through a second temperature sensor; an electric reversing valve is installed at the outlet of each oil inlet metering valve; when the electric reversing valve is not electrified, the outlet of the corresponding oil inlet metering valve is communicated with a second oil tank T2 through a second overflow valve, the second overflow valve adjusts the outlet pressure of the oil inlet metering valve, the oil outlet pressure of the outlet of the oil inlet metering valve is measured through a second pressure sensor, and the oil outlet temperature of the outlet of the oil inlet metering valve is measured through a third temperature sensor; when the electric reversing valve is electrified, the outlet of the corresponding oil inlet metering valve is communicated with a second oil tank T2 through a third fine filter and a flowmeter.
The liquid level meter, the first temperature sensor, the first heat exchanger, the first pressure sensor, the second temperature sensor, the second pressure sensor and the third temperature sensor are all electrically connected with the industrial personal computer.
The reliability testing device for the oil inlet metering valves of the common rail pump can realize the simultaneous testing of 16 oil inlet metering valves, greatly reduce the requirements on an oil supply system by adjusting the phase difference of PWM signals, and can carry out sine flutter testing and switch testing under fixed oil inlet pressure and oil outlet pressure, accelerated reliability testing under the condition of no oil supply and flow testing of each oil inlet metering valve under the fixed oil inlet pressure and the oil outlet pressure by applying the reliability testing device for the oil inlet metering valves of the common rail pump. The testing device and the testing method can simultaneously test a plurality of oil inlet metering valves on the premise of ensuring the oil inlet temperature and the cleanliness, are simple and convenient to operate and controllable in process, and have great significance in the reliability test of the oil inlet metering valves of the common rail pump.
In a further improvement, each set of oil supply system comprises a valve block, wherein the valve block is provided with a first mounting port, a second mounting port, a third mounting port, a fourth mounting port, a fifth mounting port, a sixth mounting port, a seventh mounting port, an eighth mounting port, a ninth mounting port, eight oil inlet metering valve mounting ports and eight electric reversing valve mounting ports;
the first mounting port is used for mounting a first overflow valve, the second mounting port is used for mounting a second pressure sensor, the third mounting port is used for mounting a third temperature sensor, the fourth mounting port is connected to the outlet of the second fine filter to serve as the oil inlet of the valve block, the fifth mounting port is used for mounting the second temperature sensor, the sixth mounting port is used for mounting the first pressure sensor, the seventh mounting port is connected to the outlet of the second fine filter to serve as the oil inlet of the valve block, the eighth mounting port is used for mounting the second overflow valve, and the ninth mounting port is communicated with a second oil tank T2 through an oil pipe;
and an oil inlet metering valve is correspondingly installed in each oil inlet metering valve installation opening, and an electric reversing valve is correspondingly installed in each electric reversing valve installation opening.
Through installing 16 oil feed metering valves respectively on two integral type valve blocks, saved a large amount of tube coupling for whole testing arrangement compact structure, maintenance are convenient.
In a further improvement, the oil inlet metering valve is mounted on the valve block through a valve seat. The matched valve seat is arranged, so that the oil inlet metering valves of different models can be replaced conveniently, a valve block does not need to be replaced, and the cost is saved.
The control signal of the oil inlet metering valve is given by an industrial personal computer, a first data acquisition card, a drive circuit, a Hall current sensor and a Hall current sensor signal acquisition circuit;
four analog voltage output channels of the first data acquisition card all output PWM signals, and realize slope change and step change of PWM duty ratio of oil inlet metering valve control signals through programming, each way of PWM signals acts on corresponding N-channel MOS tube to drive four parallel oil inlet metering valves, a Hall type current sensor is sleeved on a loop of a driving circuit to acquire current signals of the four corresponding oil inlet metering valves, and the current signals output by the Hall type current sensor are converted into analog voltage signals through precise resistance voltage division and sent into the analog voltage input channels of the first data acquisition card.
Further improvement, the sine change of the PWM duty ratio of the control signal of the oil inlet metering valve is realized through LabVIEW programming;
each path of PWM signal drives four parallel driving oil inlet metering valves through MOS tubes, corresponding Hall type current sensors are sleeved on a main loop of a driving circuit, the average actual current of each oil inlet metering valve is obtained by dividing the current value acquired by the Hall type current sensors by 4, then the actual current is subjected to sliding average filtering to obtain equivalent current, the sampling number of a sliding average filtering data buffer area is 50, and finally the actual frequency of the equivalent current is calculated.
The method for testing the reliability testing device based on the common rail pump oil inlet metering valve comprises the following steps of testing the flutter performance of the oil inlet metering valve when the driving current is changed according to the sine of 1.5-1.9A and the frequency is 10 Hz:
1) the 4 analog voltage output channels of the first data acquisition card generate PWM signals with the frequency of 400Hz and the duty ratio amplitude of 54-60% changing according to 10Hz sine, the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by the AO0 channels and the AO2 channels are the same, the phases of the PWM signals output by the AO1 channels and the AO3 channels are the same, and the phase difference of the PWM signals output by the AO0 channels and the AO1 channels is 180 degrees;
2) and (3) opening the gear type oil pump, and adjusting the first overflow valve and the second overflow valve to enable the inlet pressure of the oil inlet metering valve to be 8 +/-0.2 bar and the outlet pressure to be 2 +/-0.2 bar, counting after the pressures at all positions are stable, recording a sine change cycle of a driving current signal as one time, retesting the performance of the oil inlet metering valve once every nine million times and analyzing the change trend, and running for three thousand, six million times in total.
A method for testing the reliability of an oil inlet metering valve of a common rail pump comprises the following steps of testing the switching performance of the oil inlet metering valve when the drive current is 0A-2.4 +/-0.1A and 10Hz is subjected to sinusoidal variation:
1) the 4 analog voltage output channels of the first data acquisition card generate PWM signals with the frequency of 400Hz and the duty ratio amplitude of 0-76% changing according to 10Hz sine, and the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by the AO0 channels and the AO2 channels are the same, the phases of the PWM signals output by the AO1 channels and the AO3 channels are the same, and the phase difference of the PWM signals output by the AO0 channels and the AO1 channels is 180 degrees;
2) and (3) opening the gear type oil pump, adjusting the first overflow valve and the second overflow valve to enable the inlet pressure of the oil inlet metering valve to be 8 +/-0.2 bar and the outlet pressure to be 2 +/-0.2 bar, starting counting after the pressure at each part is stable, recording a sine change cycle of a driving current signal as one time, running for a total of fourteen million times, and comparing the change trend of the performance of each oil metering valve before and after testing.
A method for testing the reliability testing device based on the oil inlet metering valve of the common rail pump comprises the following steps of when the driving current is 1.6A-2.0A and 100Hz in sinusoidal change, testing the accelerated reliability of the oil inlet metering valve:
1) the 4 analog voltage output channels of the first data acquisition card generate PWM signals with the frequency of 4000Hz and the duty ratio amplitude of 44% -76% which change according to 100Hz sine, and the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by the AO0 channels and the AO2 channels are the same, the phases of the PWM signals output by the AO1 channels and the AO3 channels are the same, and the phase difference of the PWM signals output by the AO0 channels and the AO1 channels is 180 degrees;
2) and starting counting when the oil is not passed, recording a sinusoidal variation period of the driving current signal as one time, running for five hundred forty thousand times in total, and comparing variation trends of the performance of each oil metering valve before and after the test.
The method for testing the reliability testing device based on the common rail pump oil inlet metering valve comprises the following steps of testing the flow of the oil inlet metering valve when the driving current is 1.6A, and testing the constant current:
1) the 4 analog voltage output channels of the first data acquisition card generate PWM signals with the frequency of 400Hz and the duty ratio amplitude of 44%, and the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by the AO0 channels and the AO2 channels are the same, the phases of the PWM signals output by the AO1 channels and the AO3 channels are the same, and the phase difference between the PWM signals output by the AO0 channels and the AO1 channels is 180 degrees;
2) the gear type oil pump is opened, the first overflow valve and the second overflow valve are adjusted, so that the inlet pressure of the oil inlet metering valve is 4 +/-0.2 bar, the outlet pressure of the oil inlet metering valve is 2 +/-0.2 bar, the electric reversing valves are sequentially electrified, the outlet flow of the corresponding oil inlet metering valve is measured, the variation trend of the flow is compared, whether the oil inlet metering valve fails or not is judged, and the test is carried out once every 12 hours.
Compared with the prior art, the invention has the following beneficial effects:
the reliability testing device and the testing method for the oil inlet metering valves of the common rail pump can realize the simultaneous testing of 16 oil inlet metering valves, greatly reduce the requirements on an oil supply system by adjusting the phase difference of PWM signals, and save a large amount of pipeline connection by respectively installing the 16 oil inlet metering valves on two integrated valve blocks, so that the whole testing device has a compact structure and is convenient to maintain. The reliability testing device for the oil inlet metering valves of the common rail pump can be used for performing sine flutter testing and switch testing under fixed oil inlet pressure and oil outlet pressure, acceleration reliability testing under the condition of no oil supply and flow testing of each oil inlet metering valve under the fixed oil inlet pressure and the oil outlet pressure. The testing device and the testing method can simultaneously test a plurality of oil inlet metering valves on the premise of ensuring the oil inlet temperature and the cleanliness, are simple and convenient to operate and controllable in process, and have great significance in the reliability test of the oil inlet metering valves of the common rail pump. The testing device and the measuring method provided by the invention have the advantages of stable performance, simplicity and convenience in operation and accurate result, and are significant to development and batch production of the common rail pump oil inlet metering valve.
Drawings
FIG. 1 is a schematic diagram of a reliability testing device for an oil inlet metering valve of a common rail pump according to the present invention;
FIG. 2 is a schematic structural view of the left valve block of FIG. 1;
FIG. 3 is a schematic structural view of the right valve block of FIG. 1;
FIG. 4 is a schematic diagram of a common rail pump oil inlet metering valve drive circuit according to the present invention;
FIG. 5 shows PWM voltage signals when the current of the oil inlet metering valve of the common rail pump varies sinusoidally from 1.6A to 1.8A;
FIG. 6 shows the actual average current of the common rail pump oil inlet metering valve of the present invention when the current varies sinusoidally from 1.6A to 1.8A;
FIG. 7 shows equivalent average current of the common rail pump oil inlet metering valve of the present invention when current varies sinusoidally from 1.6A to 1.8A;
FIG. 8 shows PWM voltage signals when the current of the oil inlet metering valve of the common rail pump varies sinusoidally from 0A to 2.4A;
FIG. 9 shows the actual average current of the common rail pump oil inlet metering valve of the present invention when the current varies sinusoidally from 0A to 2.4A;
FIG. 10 shows equivalent average current of the common rail pump oil inlet metering valve according to the present invention when current varies sinusoidally from 0A to 2.4A;
FIG. 11 shows PWM voltage signals when the current of the oil inlet metering valve of the common rail pump varies sinusoidally from 1.6A to 2A;
FIG. 12 shows the actual average current of the common rail pump oil inlet metering valve of the present invention when the current varies sinusoidally from 1.6A to 2A;
FIG. 13 shows equivalent average current of the common rail pump oil inlet metering valve of the present invention when current varies sinusoidally from 1.6A to 2A.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes, structures, mutual positions and connection relations of the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the examples:
the first embodiment is as follows: as shown in fig. 1-4, the reliability testing device for the common rail pump oil inlet metering valve comprises a first oil tank T1 containing calibration oil, a second oil tank T2 and two sets of oil supply systems, such as the dashed box part in fig. 1.
The gear type oil pump 55 sucks oil from the second oil tank T2, and sends the oil to the first oil tank T1 through the first coarse filter 54 of 200 μm, the first fine filter 56 of 10 μm and the first heat exchanger 57 in this order, and the first oil tank T1 is provided with the liquid level meter 58 and the first temperature sensor 60.
Wherein an oil supply system includes: the gear type oil pump 2 sucks oil from a first oil tank T1 filled with calibration oil meeting ISO 4113 standard, and the oil is filtered by a second coarse filter 1 with the diameter of 200 mu m and a second fine filter 3 with the diameter of 2 mu m and then respectively sent to inlets of eight oil inlet metering valves (8, 9, 10, 11, 12, 13, 14 and 15); the outlet pressure of the gear type oil pump 2 is regulated by a first overflow valve 4 and is stabilized by an accumulator 5; the outlet oil pressure at the outlet of the gear type oil pump 2 is measured by a first pressure sensor 6, and the outlet oil temperature at the outlet of the gear type oil pump 2 is measured by a second temperature sensor 7; an electric reversing valve is installed at the outlet of each oil inlet metering valve; eight oil inlet metering valves (8, 9, 10, 11, 12, 13, 14 and 15) correspond to 8 electric reversing valves (16, 17, 18, 19, 20, 21, 22 and 23).
When the electric reversing valve is not electrified, the outlet of the corresponding oil inlet metering valve is communicated with a second oil tank T2 through a second overflow valve 24, the outlet pressure of the oil inlet metering valve is adjusted by the second overflow valve 24, the oil outlet pressure of the oil inlet metering valve outlet is measured by a second pressure sensor 25, and the oil outlet temperature of the oil inlet metering valve outlet is measured by a third temperature sensor 26; when the electric reversing valve is electrified, the outlet of the corresponding oil inlet metering valve is communicated with a second oil tank T2 through a third fine filter 27 and a flowmeter 28.
Another oil supply system includes: the gear type oil pump 53 sucks oil from a first oil tank T1 filled with calibration oil meeting ISO 4113 standard, and the oil is filtered by a second coarse filter 61 with the diameter of 200 mu m and a second fine filter 52 with the diameter of 2 mu m and then respectively sent to inlets of eight oil inlet metering valves (37, 38, 39, 40, 41, 42, 43 and 44); the outlet pressure of the gear type oil pump 52 is regulated by the first relief valve 51 and stabilized by the accumulator 50; the oil outlet pressure at the outlet of the gear type oil pump 53 is measured by the first pressure sensor 48, and the oil outlet temperature at the outlet of the gear type oil pump 53 is measured by the second temperature sensor 49; an electric reversing valve is installed at the outlet of each oil inlet metering valve; eight oil inlet metering valves (37, 38, 39, 40, 41, 42, 43, 44) correspond to 8 electric reversing valves (29, 30, 31, 32, 33, 34, 35, 36).
When the electric reversing valve is not electrified, the outlet of the corresponding oil inlet metering valve is communicated with a second oil tank T2 through a second overflow valve 47, the outlet pressure of the oil inlet metering valve is adjusted by the second overflow valve 47, the oil outlet pressure of the oil inlet metering valve outlet is measured by a second pressure sensor 45, and the oil outlet temperature of the oil inlet metering valve outlet is measured by a third temperature sensor 46; when the electric reversing valve is electrified, the outlet of the corresponding oil inlet metering valve is communicated with a second oil tank T2 through a third fine filter 27 and a flowmeter 28.
The liquid level meter 58, the first temperature sensor 60, the first heat exchanger 57, the first pressure sensor 6, the second temperature sensor 7, the second pressure sensor 25 and the third temperature sensor 26 are all electrically connected with the industrial personal computer 31.
The reliability testing device for the oil inlet metering valves of the common rail pump can realize the simultaneous testing of 16 oil inlet metering valves, greatly reduce the requirements on an oil supply system by adjusting the phase difference of PWM signals, and can carry out sine flutter testing and switch testing under fixed oil inlet pressure and oil outlet pressure, accelerated reliability testing under the condition of no oil supply and flow testing of each oil inlet metering valve under the fixed oil inlet pressure and the oil outlet pressure by applying the reliability testing device for the oil inlet metering valves of the common rail pump. The testing device and the testing method can simultaneously test a plurality of oil inlet metering valves on the premise of ensuring the oil inlet temperature and the cleanliness, are simple and convenient to operate and controllable in process, and have great significance in the reliability test of the oil inlet metering valves of the common rail pump.
In this embodiment, each set of oil supply system includes a valve block, and the valve block is provided with a first mounting port, a second mounting port, a third mounting port, a fourth mounting port, a fifth mounting port, a sixth mounting port, a seventh mounting port, an eighth mounting port, a ninth mounting port, eight oil inlet metering valve mounting ports and eight electric directional valve mounting ports;
the first mounting port is used for mounting a first overflow valve 4, the second mounting port is used for mounting a second pressure sensor 25, the third mounting port is used for mounting a third temperature sensor 26, the fourth mounting port is connected to the outlet of the second fine filter 3 to serve as the oil inlet of the valve block, the fifth mounting port is used for mounting a second temperature sensor 7, the sixth mounting port is used for mounting a first pressure sensor 6, the seventh mounting port is connected to the inlet of the third fine filter 27 to serve as the one-way oil outlet of the valve block, the eighth mounting port is used for mounting a second overflow valve 24, and the ninth mounting port is communicated with a second oil tank T2 through an oil pipe;
and an oil inlet metering valve is correspondingly installed in each oil inlet metering valve installation opening, and an electric reversing valve is correspondingly installed in each electric reversing valve installation opening.
The dotted line frame part in the attached drawing 1 is made into two integrated valve blocks shown in the attached drawings 2 and 3, all measured oil inlet metering valves, overflow valves, electric reversing valves, pressure sensors and temperature sensors are installed on the valve blocks, a large number of complex pipeline connections are omitted, matched valve seats are designed on the oil inlet metering valves to be used in a replaceable mode, the measured oil inlet metering valves (8, 9, 10, 11, 12, 13, 14 and 15) are installed on the left side valve block shown in the attached drawing 2, and the measured oil inlet metering valves (37, 38, 39, 40, 41, 42, 43 and 44) are installed on the right side valve block shown in the attached drawing 3; through installing 16 oil feed metering valves respectively on two integral type valve blocks, saved a large amount of tube coupling for whole testing arrangement compact structure, maintenance are convenient.
In this embodiment, the oil-inlet metering valve is mounted on the valve block by a valve seat. The matched valve seat is arranged, so that the oil inlet metering valves of different models can be replaced conveniently, a valve block does not need to be replaced, and the cost is saved.
In this embodiment, a control signal of the oil inlet metering valve is given by an industrial personal computer, a first data acquisition card, a drive circuit, a hall type current sensor and a hall type current sensor signal acquisition circuit; the first data acquisition card is of type NI PCIe-6323.
Four analog voltage output channels of the first data acquisition card all output PWM signals, 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, and the slope change and the step change of the PWM duty ratio of the oil inlet metering valve control signal are realized through programming. As shown in fig. 4, a PWM signal output by AO0 acts on a corresponding N-channel MOS transistor to drive four parallel oil-feeding metering valves, a schottky diode SK1010 is used as a large-current freewheeling diode, a hall-type current sensor is sleeved on a loop of a driving circuit to collect current signals of the corresponding four oil-feeding metering valves, the current signals output by the hall-type current sensor are converted into analog voltage signals through precise resistance voltage division and sent to an analog voltage input channel AI0 of a first data acquisition card to collect current signals of the 4 oil-feeding metering valves, and so on, and 16 oil-feeding metering valves are driven in total.
In the embodiment, the sinusoidal change of the PWM duty ratio of the control signal of the oil inlet metering valve is realized by LabVIEW programming;
each path of PWM signal drives four oil inlet metering valves connected in parallel through MOS tubes, the corresponding Hall current sensor is sleeved on a main loop of the driving circuit, the average actual current of each oil inlet metering valve is obtained by dividing the current value acquired by the Hall current sensor by 4, then the actual current is subjected to sliding average filtering to obtain equivalent current, the sampling number of a sliding average filtering data buffer area is 50, and finally the actual frequency of the equivalent current is calculated.
Controlling the oil inlet temperature: when the temperature measured by the second temperature sensor is less than 59 ℃, the heater 60 is turned on for heating, and when the temperature measured by the second temperature sensor is more than 61 ℃, the cooling water switch of the first heat exchanger 57 is turned on, so that the oil inlet temperature of all the oil inlet metering valves can be controlled within the range of 60 +/-2 ℃.
Example two:
the method for testing the reliability testing device based on the common rail pump oil inlet metering valve comprises the following steps of testing the flutter performance of the oil inlet metering valve when the driving current is changed according to the sine of 1.5-1.9A and the frequency is 10 Hz:
1) as shown in fig. 5, 4 analog voltage output channels of the first data acquisition card all generate PWM signals with frequency of 400Hz and duty ratio amplitude of 54% -60% changing according to 10Hz sine, the 4 analog voltage output channels are recorded as AO0, AO1, AO2 and AO3, signal Channel1 corresponding to AO0 corresponds to oil inlet metering valves 8-11, signal Channel2 corresponding to AO1 corresponds to oil inlet metering valves 12-15, signal Channel3 corresponding to AO2 corresponds to oil inlet metering valves 37-40, signal Channel4 corresponding to AO3 corresponds to oil inlet metering valves 41-44, wherein Channel1 and Channel3 have the same phase, Channel2 and Channel4 have the same phase, Channel1 and Channel2 have a phase difference of 180 °, actual currents are measured, as shown in fig. 6, only actual currents shown in Channel1 and Channel2 are displayed, equivalent currents are obtained after sliding filtering, and as shown in fig. 7.
2) The gear type oil pumps 2 and 53 are opened, and the first overflow valves 4 and 51 and the second overflow valves 24 and 27 are adjusted, so that the inlet pressure of the oil inlet metering valve is 8 +/-0.2 bar, namely the values of the first pressure sensors 6 and 49 are 8 +/-0.2 bar; the outlet pressure is 2 + -0.2 bar, i.e. the values of the second pressure sensors 25 and 45 are 2 + -0.2 bar; counting is started after the pressure at each position is stable, a sine change period of a driving current signal is recorded as one time, the performance of the oil inlet metering valve is repeatedly measured every nine million times, the change trend is analyzed, and the operation is carried out for three thousand, six million times in total.
Example three:
a method for testing the reliability of an oil inlet metering valve of a common rail pump comprises the following steps of testing the switching performance of the oil inlet metering valve when the drive current is 0A-2.4 +/-0.1A and 10Hz is subjected to sinusoidal variation:
1) as shown in fig. 8, 4 analog voltage output channels of the first data acquisition card all generate PWM signals with frequency of 400Hz and duty ratio amplitude of 0% -76% changing according to 10Hz sine, the 4 analog voltage output channels are recorded as AO0, AO1, AO2 and AO3, signal Channel1 corresponding to AO0 corresponds to oil inlet metering valves 8-11, signal Channel2 corresponding to AO1 corresponds to oil inlet metering valves 12-15, signal Channel3 corresponding to AO2 corresponds to oil inlet metering valves 37-40, signal Channel4 corresponding to AO3 corresponds to oil inlet metering valves 41-44, wherein Channel1 and Channel3 have the same phase, Channel2 and Channel4 have the same phase, Channel1 and Channel2 have a phase difference of 180 °, actual currents are measured, as shown in fig. 9, only actual currents shown in Channel1 and Channel2 are displayed, equivalent currents are obtained after sliding filtering, and as shown in fig. 10.
2) The gear type oil pumps 2 and 53 are opened, and the first overflow valves 4 and 51 and the second overflow valves 24 and 27 are adjusted, so that the inlet pressure of the oil inlet metering valve is 8 +/-0.2 bar, namely the values of the first pressure sensors 6 and 49 are 8 +/-0.2 bar; the outlet pressure is 2 + -0.2 bar, i.e. the values of the second pressure sensors 25 and 45 are 2 + -0.2 bar; and counting after the pressure at each position is stable, recording a sine change period of the driving current signal as one time, running for a thousand, four and million times in total, and comparing the change trend of the performance of each oil metering valve before and after the test.
Example four:
a method for testing the reliability testing device based on the oil inlet metering valve of the common rail pump comprises the following steps of when the driving current is 1.6A-2.0A and 100Hz in sinusoidal change, testing the accelerated reliability of the oil inlet metering valve:
1) as shown in fig. 11, 4 analog voltage output channels of the first data acquisition card all generate PWM signals with frequencies of 4000Hz, duty ratios of 44% -76% vary sinusoidally according to 100Hz, the 4 analog voltage output channels are recorded as AO0, AO1, AO2 and AO3, a signal Channel1 corresponding to AO0 corresponds to 8-11 oil inlet metering valves, a signal Channel2 corresponding to AO1 corresponds to 12-15 oil inlet metering valves, an signal Channel3 corresponding to AO2 corresponds to 37-40 oil inlet metering valves, a signal Channel4 corresponding to AO3 corresponds to 41-44 oil inlet metering valves, wherein the phases of Channel1 and Channel3 are the same, the phases of Channel2 and Channel4 are the same, the phase difference between Channel1 and Channel2 is 180 °, actual currents are measured, as shown in fig. 12, only actual currents shown in Channel1 and Channel2 are displayed, equivalent currents are obtained after sliding filtering, and as shown in fig. 13.
2) And performing an oil-free test: counting is started, one sinusoidal variation period of the driving current signal is recorded once, five hundred forty thousand times of operation is carried out in total, and the variation trend of the performance of each oil metering valve before and after the test is compared.
Example five:
a method for testing the reliability of a common rail pump oil inlet metering valve comprises the following steps of testing the flow of the oil inlet metering valve when the driving current is 1.6A, and testing the flow under the constant current, wherein the method comprises the following steps:
1) the 4 analog voltage output channels of the first data acquisition card generate PWM signals with the frequency of 400Hz and the duty ratio amplitude of 44%, and the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by the AO0 channels and the AO2 channels are the same, the phases of the PWM signals output by the AO1 channels and the AO3 channels are the same, and the phase difference between the PWM signals output by the AO0 channels and the phases of the PWM signals output by the AO1 channels is 180 degrees;
2) the gear type oil pumps 2 and 53 are opened, and the first overflow valves 4 and 51 and the second overflow valves 24 and 47 are adjusted, so that the inlet pressure of the oil inlet metering valve is 4 +/-0.2 bar, namely the values of the first pressure sensors 6 and 49 are 4 +/-0.2 bar; the outlet pressure is 2 + -0.2 bar, i.e. the values of the second pressure sensors 25 and 45 are 2 + -0.2 bar; the outlet pressure is 2 +/-0.2 bar, the electric reversing valves 16-23 and 29-36 are sequentially electrified (which way of electric reversing valve is to measure the flow of the return oil of the oil inlet metering valve through the flow meter), the oil outlet of each oil inlet metering valve sequentially flows through the flow meter 28, the outlet flow of the oil inlet metering valve is measured, the change trend of the flow is compared, whether the oil inlet metering valve fails or not is judged, and the test is carried out once every 12 hours.
The invention is described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and technical solution, or to directly apply the inventive concept and technical solution to other occasions without modification.
Claims (7)
1. Common rail pump oil feed metering valve reliability test device, its characterized in that: the device comprises a first oil tank T1 containing calibration oil, a second oil tank T2 and two sets of oil supply systems;
the gear type oil pump sucks oil from the second oil tank T2, and the oil is sent to a first oil tank T1 through a first coarse filter, a first fine filter and a first heat exchanger in sequence, and a liquid level meter and a first temperature sensor are arranged in the first oil tank T1;
each set of oil supply system is as follows: the gear type oil pump absorbs oil from a first oil tank T1 and respectively sends the oil to eight oil inlet metering valve inlets through a second coarse filter and a second fine filter; the outlet pressure of the gear type oil pump is regulated by a first overflow valve and is stabilized by an energy accumulator; the oil outlet pressure of the outlet of the gear type oil pump is measured through a first pressure sensor, and the oil outlet temperature of the outlet of the gear type oil pump is measured through a second temperature sensor; an electric reversing valve is installed at the outlet of each oil inlet metering valve; when the electric reversing valve is not electrified, the outlet of the corresponding oil inlet metering valve is communicated with a second oil tank T2 through a second overflow valve, the second overflow valve adjusts the outlet pressure of the oil inlet metering valve, the oil outlet pressure of the outlet of the oil inlet metering valve is measured through a second pressure sensor, and the oil outlet temperature of the outlet of the oil inlet metering valve is measured through a third temperature sensor; when the electric reversing valve is electrified, the outlet of the corresponding oil inlet metering valve is communicated with a second oil tank T2 through a third fine filter and a flowmeter;
control signals of the oil inlet metering valve are given by an industrial personal computer, a first data acquisition card, a driving circuit, a Hall current sensor and a Hall current sensor signal acquisition circuit;
the four-channel MOS tube driving circuit comprises a first data acquisition card, a second data acquisition card, a Hall type current sensor, a first data acquisition card, a second data acquisition card, a third data acquisition card, a fourth data acquisition card and a fourth data acquisition card, wherein the first data acquisition card is used for acquiring analog voltage signals, the fourth data acquisition card is used for acquiring current signals of the fourth data acquisition card, the fourth data acquisition card is used for acquiring analog voltage signals, and the fourth data acquisition card is used for acquiring analog voltage signals;
the sinusoidal change of the PWM duty ratio of the oil inlet metering valve control signal is realized through LabVIEW programming, each path of PWM signal drives four oil inlet metering valves which are connected in parallel through MOS tubes, corresponding Hall type current sensors are sleeved on a total loop of a driving circuit, the average actual current of each oil inlet metering valve is obtained by dividing the current value acquired by the Hall type current sensors by 4, then the actual current is subjected to sliding average filtering to obtain equivalent current, the sampling number of a sliding average filtering data buffer area is 50, and finally the actual frequency of the equivalent current is calculated.
2. The common rail pump oil feed metering valve reliability testing device of claim 1, wherein: each set of oil supply system comprises a valve block, wherein a first mounting port, a second mounting port, a third mounting port, a fourth mounting port, a fifth mounting port, a sixth mounting port, a seventh mounting port, an eighth mounting port, a ninth mounting port, eight oil inlet metering valve mounting ports and eight electric reversing valve mounting ports are formed in the valve block;
the first mounting port is used for mounting a first overflow valve, the second mounting port is used for mounting a second pressure sensor, the third mounting port is used for mounting a third temperature sensor, the fourth mounting port is connected to the outlet of the second fine filter and serves as the oil inlet of the valve block, the fifth mounting port is used for mounting the second temperature sensor, the sixth mounting port is used for mounting the first pressure sensor, the seventh mounting port is connected to the inlet of the third fine filter and serves as the oil outlet of the valve block, the eighth mounting port is used for mounting the second overflow valve, and the ninth mounting port is communicated with a second oil tank T2 through an oil pipe;
and an oil inlet metering valve is correspondingly installed in each oil inlet metering valve installation opening, and an electric reversing valve is correspondingly installed in each electric reversing valve installation opening.
3. The common rail pump oil feed metering valve reliability testing device of claim 2, wherein: the oil inlet metering valve is installed on the valve block through the valve seat.
4. The method for testing the reliability of the oil inlet metering valve of the common rail pump according to any one of claims 1 to 3, is characterized in that: the method comprises the following steps of testing the flutter performance of the oil inlet metering valve when the driving current varies according to the sine of 1.5-1.9A and the frequency is 10 Hz:
1) the model of the first data acquisition card is NI PCIe-6323, 4 analog voltage output channels of the first data acquisition card generate PWM signals with frequency of 400Hz and duty ratio amplitude of 54-60% changing according to 10Hz sine, and the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by AO0 and AO2 channels are the same, the phases of the PWM signals output by AO1 and AO3 channels are the same, and the phase difference of the PWM signals output by AO0 and AO1 channels is 180 degrees;
2) and (3) opening the gear type oil pump, and adjusting the first overflow valve and the second overflow valve to enable the inlet pressure of the oil inlet metering valve to be 8 +/-0.2 bar and the outlet pressure to be 2 +/-0.2 bar, counting after the pressures at all positions are stable, recording a sine change cycle of a driving current signal as one time, retesting the performance of the oil inlet metering valve once every nine million times and analyzing the change trend, and running for three thousand, six million times in total.
5. The method for testing the reliability of the oil inlet metering valve of the common rail pump according to any one of claims 1 to 3, is characterized in that: when drive current is 0A ~2.4 +/-0.1A, 10Hz sinusoidal variation, to oil feed metering valve switch performance test, its step is:
1) the 4 analog voltage output channels of the first data acquisition card generate PWM signals with the frequency of 400Hz and the duty ratio amplitude of 0-76% changing according to 10Hz sine, and the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by the AO0 channels and the AO2 channels are the same, the phases of the PWM signals output by the AO1 channels and the AO3 channels are the same, and the phase difference of the PWM signals output by the AO0 channels and the AO1 channels is 180 degrees;
2) and (3) opening the gear type oil pump, adjusting the first overflow valve and the second overflow valve to enable the inlet pressure of the oil inlet metering valve to be 8 +/-0.2 bar and the outlet pressure to be 2 +/-0.2 bar, starting counting after the pressure at each part is stable, recording a sine change cycle of a driving current signal as one time, running for a total of fourteen million times, and comparing the change trend of the performance of each oil metering valve before and after testing.
6. The method for testing the reliability of the oil inlet metering valve of the common rail pump according to any one of claims 1 to 3, is characterized in that: when drive current is 1.6A ~2.0A, 100Hz sinusoidal variation, to oil feed metering valve reliability test with higher speed, its step is:
1) the 4 analog voltage output channels of the first data acquisition card generate PWM signals with the frequency of 4000Hz and the duty ratio amplitude of 44% -76% which change according to 100Hz sine, and the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by the AO0 channels and the AO2 channels are the same, the phases of the PWM signals output by the AO1 channels and the AO3 channels are the same, and the phase difference of the PWM signals output by the AO0 channels and the AO1 channels is 180 degrees;
2) the test was carried out without oil passage: counting is started, one sinusoidal variation period of the driving current signal is recorded once, five hundred forty thousand times of operation is carried out in total, and the variation trend of the performance of each oil metering valve before and after the test is compared.
7. Reliability testing device for oil inlet metering valve of common rail pump according to any one of claims 1 to 3
A method of performing a test, characterized by: be 1.6A including drive current, to oil feed metering valve flow test, its step is:
1) the 4 analog voltage output channels of the first data acquisition card generate PWM signals with the frequency of 400Hz and the duty ratio amplitude of 44%, and the 4 analog voltage output channels are marked as AO0, AO1, AO2 and AO3, wherein the phases of the PWM signals output by the AO0 channels and the AO2 channels are the same, the phases of the PWM signals output by the AO1 channels and the AO3 channels are the same, and the phase difference between the PWM signals output by the AO0 channels and the AO1 channels is 180 degrees;
2) the gear type oil pump is opened, the first overflow valve and the second overflow valve are adjusted, so that the inlet pressure of the oil inlet metering valve is 4 +/-0.2 bar, the outlet pressure of the oil inlet metering valve is 2 +/-0.2 bar, the electric reversing valves are sequentially electrified, the outlet flow of the corresponding oil inlet metering valve is measured, the variation trend of the flow is compared, whether the oil inlet metering valve fails or not is judged, and the test is carried out once every 12 hours.
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| CN205315180U (en) * | 2016-01-22 | 2016-06-15 | 北京亚新科天纬油泵油嘴股份有限公司 | Common rail oil piping system for injection pump |
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