CN109882472B - System and method for testing characteristics of pneumatic rear axle module assembly of commercial vehicle - Google Patents
System and method for testing characteristics of pneumatic rear axle module assembly of commercial vehicle Download PDFInfo
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Abstract
The invention discloses a system and a method for testing the characteristics of a pneumatic rear axle module assembly of a commercial vehicle. The pneumatic system simulates the pneumatic environment measurement and control system of the pneumatic rear axle module assembly to measure the characteristics of the pneumatic rear axle module assembly. The method mainly comprises the following steps: 1) the sample piece controls the flow rate and the speed of the received gas according to the pulse voltage signal III. The sample piece controls the flow and the speed of the discharged gas according to the pulse voltage signal IV; 2) the air pressure sensor monitors an air pressure signal of the sample piece and transmits the air pressure signal to the data acquisition device; 3) the data acquisition device transmits the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to an upper computer; 4) and the upper computer obtains the characteristics of the air pressure rear axle module assembly. The system and the method for testing the characteristics of the pneumatic rear axle module assembly of the commercial vehicle can test the static characteristics, the dynamic characteristics, the response characteristics and the adjusting function of the pneumatic rear axle module assembly.
Description
Technical Field
The invention relates to the technical field of automobile part testing, in particular to a system and a method for testing the characteristics of a pneumatic rear axle module assembly of a commercial vehicle.
Background
In recent years, automobile anti-lock brake systems are widely applied to trailers and semitrailers, and the traditional air pressure brake anti-lock system (ABS) has the defects of large volume, low space utilization rate and easiness in air leakage. The pneumatic rear axle module assembly simultaneously comprises the functions of a relay valve and an ABS pneumatic electromagnetic regulator, the volume of parts is reduced, the braking response speed is improved, the pipeline connection is reduced, and an integrated valve such as the pneumatic rear axle module assembly is widely used in a pneumatic braking system. In order to truly reflect each functional characteristic of the pneumatic rear axle module assembly, the design of the trocar is very significant for the test method of the pneumatic rear axle module assembly characteristic of the commercial vehicle.
At present, automobile industry standard QC/T35-2015 performance requirements and bench test methods for automobile and trailer air pressure control devices are distributed in relay valve countries, and automobile industry standard QC/T1006-2015 performance requirements and bench test methods for automobile anti-lock brake system air pressure electromagnetic regulators are distributed in air pressure ABS electromagnetic regulators, wherein test equipment requirements, test items, test conditions and performance evaluation indexes are specified specifically. However, no specific requirements are made on integrated valves such as commercial vehicle air pressure rear axle module assemblies, and no specific specifications are provided for test conditions, test items, evaluation indexes and the like, so that the air pressure rear axle module assembly test technology is not complete.
In addition, most of the conventional detection equipment for the air brake valves of the commercial vehicles mainly meets the conventional detection requirements, does not have dynamic detection capability, and cannot finish high-frequency dynamic test in the process of participating in braking like ABS.
Disclosure of Invention
The present invention is directed to solving the problems of the prior art.
The technical scheme adopted for achieving the purpose of the invention is that the characteristic testing system for the pneumatic rear axle module assembly of the commercial vehicle mainly comprises a pneumatic system, a measurement and control system and an upper computer.
The pneumatic system simulates the air pressure environment of the air pressure rear axle module assembly.
The pneumatic system mainly comprises an air source, an air source triple piece, an air storage cylinder I, an electromagnetic directional valve, an electric proportional valve, an air storage cylinder II, a sample piece, an air storage cylinder III, a manual pressure regulating valve and an air storage cylinder IV.
The gas source, the gas source triple piece, the gas storage cylinder I, the electromagnetic reversing valve, the electric proportional valve, the gas storage cylinder II, the sample piece and the gas storage cylinder III are sequentially connected through a gas pipe.
The air cylinder I, the manual pressure regulating valve, the air cylinder IV and the sample piece are sequentially connected through an air pipe.
And the gas source conveys gas to the gas storage cylinder I through the gas source triple piece.
And the air storage cylinder I conveys air to the air storage cylinder II through the electromagnetic directional valve and the electric proportional valve.
And the air cylinder I conveys air to the air cylinder IV through a manual pressure regulating valve.
The electromagnetic directional valve receives a digital voltage pulse signal I of the digital/analog conversion chip, so that the direction, the flow and the speed of the gas conveyed by the gas storage cylinder I are controlled.
And the electric proportional valve receives a pulse voltage signal II of the relay so as to control the flow and the speed of the gas delivered by the gas storage cylinder I.
And the gas storage cylinder II is used for conveying gas to the sample piece.
And the gas storage cylinder IV is used for conveying gas to the sample piece.
And the sample piece discharges gas to the gas storage cylinder III.
And the gas inlet valve of the sample controls the flow and the speed of the received gas according to the pulse voltage signal III.
And the gas outlet valve of the sample piece controls the flow and the speed of the discharged gas according to the pulse voltage signal IV.
The sample piece is an air pressure rear axle module assembly.
The measurement and control system measures characteristics of the air pressure rear axle module assembly.
The measurement and control system mainly comprises a crystal oscillator circuit, a reset circuit, a single chip microcomputer, a digital/analog conversion chip, a relay driving chip, a relay, an air inlet relay, an air outlet relay, an air pressure sensor and a data acquisition device
The crystal oscillator circuit provides a clock signal for the single chip microcomputer, so that the single chip microcomputer is driven to send an analog voltage pulse signal I to the digital/analog conversion chip, and a driving signal is sent to the relay driving chip.
The reset circuit resets the singlechip.
And the digital/analog conversion chip converts the analog voltage pulse signal I into a digital voltage pulse signal I and sends the digital voltage pulse signal I to the electromagnetic directional valve.
And the relay driving chip drives the relay to transmit a pulse voltage signal II to the electric proportional valve.
And the relay driving chip drives the air inlet relay to transmit a pulse voltage signal III to the sample piece and the data acquisition device.
And the relay driving chip drives the exhaust relay to transmit a pulse voltage signal IV to the sample piece and the data acquisition device.
The air pressure sensor monitors the air pressure signal of the gas discharged by the sample piece and transmits the air pressure signal to the data acquisition device.
And the data acquisition device transmits the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to an upper computer.
And the upper computer processes the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to obtain the characteristics of the air pressure rear axle module assembly, namely a relation curve of air pressure and time.
The method for using the commercial vehicle pneumatic rear axle module assembly characteristic test system mainly comprises the following steps:
1) and (4) building a commercial vehicle air pressure rear axle module assembly characteristic test system.
2) The crystal oscillator circuit provides a clock signal for the single chip microcomputer, so that the single chip microcomputer is driven to send an analog voltage pulse signal I to the digital/analog conversion chip, and a driving signal is sent to the relay driving chip.
3) The digital/analog conversion chip converts the analog voltage pulse signal I into a digital voltage pulse signal I and sends the digital voltage pulse signal I to the electromagnetic directional valve.
4) And the relay driving chip drives the relay to transmit a pulse voltage signal II to the electric proportional valve.
And the relay driving chip drives the air inlet relay to transmit a pulse voltage signal III to the sample piece and the data acquisition device.
And the relay driving chip drives the exhaust relay to transmit a pulse voltage signal IV to the sample piece and the data acquisition device.
5) The air source conveys air to the air storage cylinder I through the air source triple piece.
And the electric proportional valve controls the flow and the speed of the gas delivered by the gas storage cylinder I according to the pulse voltage signal II.
The electromagnetic directional valve receives the digital voltage pulse signal I of the D/A conversion chip, thereby controlling the direction, flow and speed of the gas delivered by the gas storage cylinder I.
6) The sample piece controls the flow rate and the speed of the received gas according to the pulse voltage signal III.
The sample piece controls the flow rate and the speed of the discharged gas according to the pulse voltage signal IV.
7) The air pressure sensor monitors the air pressure signal of the sample piece and transmits the air pressure signal to the data acquisition device.
8) The data acquisition device transmits the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to an upper computer.
9) And the upper computer processes the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to obtain the characteristics of the air pressure rear axle module assembly, namely a relation curve of air pressure and time.
The technical effect of the present invention is undoubted. The invention provides a system and a method for testing the characteristics of a pneumatic rear axle module assembly of a commercial vehicle, which mainly take the static characteristics, the dynamic characteristics, the response characteristics and the adjusting function of the pneumatic rear axle module assembly as main test contents. According to the invention, different test air pressures can be set according to specific test requirements, and the lower computer hardware control system can set the number of boosting steps and the number of reducing steps of the air pressure rear axle module assembly in the process of braking with ABS and the on-off time of the air inlet electromagnetic valve and the air outlet electromagnetic valve; meanwhile, the invention can simulate two working modes of conventional braking of the air pressure rear axle module assembly and continuous working of the ABS system, and in addition, the data acquisition device can accurately record the relation curve of the test air pressure, the pulse voltage of the air inlet and outlet electromagnetic valve and the time in real time.
Drawings
FIG. 1 is a block diagram of a test system;
FIG. 2 is a pneumatic section layout;
FIG. 3 is a pin diagram of USB 2828;
FIG. 4 is a circuit diagram of a hardware control system of the pneumatic system and the measurement and control system;
FIG. 5 is a data collection flow chart;
FIG. 6 is a schematic diagram of a system;
in the figure: the gas source control device comprises an upper computer 3, a gas source 101, a gas source triple piece 102, a gas storage cylinder I103, an electromagnetic directional valve 104, an electric proportional valve 105, a gas storage cylinder II106, a sample piece 107, a gas storage cylinder III108, a manual pressure regulating valve 109, a gas storage cylinder IV110, a crystal oscillator circuit 201, a reset circuit 202, a single chip microcomputer 203, a digital/analog conversion chip 204, a relay driving chip 205, a relay 206, an air inlet relay 207, an air outlet relay 208, an air pressure sensor 209 and a data acquisition device 210.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
referring to fig. 1 to 6, the system for testing the characteristics of the pneumatic rear axle module assembly of the commercial vehicle mainly comprises a pneumatic system, a measurement and control system and an upper computer 3.
The pneumatic system simulates the air pressure environment of the air pressure rear axle module assembly.
The pneumatic system mainly comprises an air source 101, an air source triple piece 102, an air storage cylinder I103, an electromagnetic directional valve 104, an electric proportional valve 105, an air storage cylinder II106, a sample piece 107, an air storage cylinder III108, a manual pressure regulating valve 109 and an air storage cylinder IV 110.
In the conventional braking process, according to the corresponding requirements in QC/T35-2015 performance requirements and bench test methods of automobile and trailer air pressure control devices, the total volume of an auxiliary pipeline in a test air path is less than 0.15L, and a brake hose with the inner diameter of 12mm is selected in the test. In the braking process with ABS intervention, according to the specific regulations in QC/T1006 plus 2015 Performance requirement and bench test method of an automobile anti-lock brake system, pneumatic brake hoses with the length of phi 12 multiplied by 1.5 and 500mm are respectively used for connecting between an air outlet of a sample and a 1L air storage tank and between a reversing valve and an air inlet of the sample, the nominal inner diameter of the reversing valve is phi 10mm, the nominal inner diameter of an unidentified connecting pipeline is phi 12mm, and the length of the unidentified connecting pipeline is not more than 300 mm.
The gas source 101, the gas source triple piece 102, the gas storage cylinder I103, the electromagnetic directional valve 104, the electric proportional valve 105, the gas storage cylinder II106, the sample piece 107 and the gas storage cylinder III108 are sequentially connected through a gas pipe.
The air cylinder I103, the manual pressure regulating valve 109, the air cylinder IV110 and the sample piece 107 are sequentially connected through an air pipe.
The gas source 101 delivers gas to the gas reservoir I103 via a gas source triplet 102.
The air storage cylinder I103 is used for conveying air to an air storage cylinder II106 through an electromagnetic directional valve 104 and an electric proportional valve 105. The air cylinder I is 40L.
The air cylinder I103 supplies air to an air cylinder IV110 through a manual pressure regulating valve 109.
The electromagnetic directional valve 104 receives the digital voltage pulse signal I of the D/A conversion chip 205, thereby controlling the direction, flow and speed of the gas delivered by the gas cylinder I103.
The electric proportional valve 105 receives a pulse voltage signal II of the relay 208, thereby controlling the flow rate and the speed of the gas delivered by the gas cylinder I103.
The gas cylinder II106 delivers gas to the sample piece 107. The air cylinder II is 10L.
The gas cylinder IV210 supplies gas to the sample 107. The air cylinder IV is 10L.
The sample 107 discharges gas to the gas cylinder III 108. The air cylinder III is 10L.
The inlet valve of the sample 107 controls the flow and velocity of the received gas in accordance with the pulsed voltage signal III.
The gas outlet valve of the sample piece 107 controls the flow rate and the speed of the discharged gas according to the pulse voltage signal IV.
The sample 107 is an air pressure rear axle module assembly.
The measurement and control system measures characteristics of the air pressure rear axle module assembly.
The measurement and control system mainly comprises a crystal oscillator circuit 201, a reset circuit 202, a single chip microcomputer 203, a digital/analog conversion chip 204, a relay driving chip 205, a relay 206, an air inlet relay 207, an air outlet relay 208, an air pressure sensor 209 and a data acquisition device 210.
The pressure sensor is an STZ1-1 type pressure transmitter which is used for outputting a standard voltage signal of 0-5V and has a power supply of +/-12V, a measuring range of 0-1600 kPa, and an accuracy of 0.3% FS; the electric proportional valve is an ITV305 type electric proportional valve with the highest supply pressure of 1.0MPa and an input signal DC of 0-5V; the lower computer system selects an AT89C52 singlechip of Atmel company as a core processor, and selects a LY-51S singlechip development board for peripheral circuit expansion; an Altai USB2828 data acquisition card is used as a data acquisition module of the test system, and the upper computer performs data analysis and processing by applying a LabVIEW2014 programming environment.
The power supply used by the AT89C52 singlechip is DC 5V, wherein the positive pole of the power supply is connected with a pin 40, and the negative pole (ground) of the power supply is connected with a pin 20. The crystal oscillator circuit adopts a 12MHz crystal oscillator, and the oscillation starting capacitor adopts a 30pF ceramic chip capacitor which is respectively connected with 18 pins and 19 pins of the single chip machine. The reset circuit consists of a 10uF electrolytic capacitor and a 10k resistor and is connected with a 9 pin of the single chip microcomputer. EA pin is connected with the anode of the power supply, the port P0 is an open circuit output, when the output is used, a pull-up resistor needs to be added, and the resistance value is generally 1 k.
The electromagnetic valve reversing and pulse voltage driving circuit is a circuit system for realizing the electromagnetic valve reversing of an assembly input gas circuit and analog output of ABS pulse voltage signals, and mainly comprises an ULN2003, a relay KM and an SSR solid-state relay. The 9 pin of ULN2003 is connected with +5V power supply, the 8 pin is connected with negative pole (ground), and the 1 pin, the 2 pin, the 3 pin, the 4 pin and the 5 pin are respectively connected with the 39 pin, the 38 pin, the 37 pin, the 36 pin and the 35 pin of the single chip microcomputer. The control relay is used for controlling the electromagnetic directional valve, and the SSR solid state relay is used for controlling the air pressure rear axle module assembly air inlet and exhaust electromagnetic valves.
The electric proportional valve driving circuit mainly functions in converting a digital signal output by a minimum system circuit of a lower computer into an analog signal, the core is a PCF8591 digital-analog conversion chip, pins 1-8 of the PCF8591 are connected with a negative pole (ground), pins 14 and 16 are connected with a +5V power supply, pins 12 and 13 are connected with the negative pole (ground), pins 9 and 10 are connected with pins 22 and 21 of a single chip microcomputer, and pin 15 is used as analog quantity input and is directly connected into the electric proportional valve.
The USB2828 data acquisition card is mainly used for acquiring pulse voltage signals of an air inlet electromagnetic valve and an air outlet electromagnetic valve of the air pressure rear axle module assembly and outputting air pressure signals. Adjusting the wire jumpers JP3, JP4 and JP5, and selecting an AD analog signal input grounding mode as a single-end input mode; and adjusting the wire jumpers JP1 and JP2 to select the input range +/-5V of the AD analog signal. Pulse voltage signals of an air inlet electromagnetic valve and an air outlet electromagnetic valve of the air pressure rear axle module assembly are respectively connected to pins 19, 37, 18 and 36 of the USB2828 data acquisition card, the output air pressure signal is connected to pin 17 of the USB2828 data acquisition card, and a negative electrode (ground) wire is connected to pin 29 of the analog ground in a unified mode.
The crystal oscillator circuit 201 provides a clock signal for the single chip microcomputer 202, so that the single chip microcomputer 202 is driven to send an analog voltage pulse signal I to the digital/analog conversion chip 205, and a driving signal is sent to the relay driving chip 205.
The reset circuit 202 resets the single chip microcomputer 203.
The digital/analog conversion chip 204 converts the analog voltage pulse signal I into a digital voltage pulse signal I, and sends the digital voltage pulse signal I to the electromagnetic directional valve 104.
The relay driver chip 205 drives the relay 206 to transmit the pulse voltage signal II to the electric proportional valve 105.
The relay driving chip 205 drives the air inlet relay 207 to transmit the pulse voltage signal III to the sample 107 and the data acquisition device 210.
The relay driver chip 205 drives the exhaust relay 208 to transmit the pulse voltage signal IV to the sample 107 and the data acquisition device 210.
The gas pressure sensor 209 monitors the gas pressure signal of the gas discharged from the sample 107 and transmits the signal to the data acquisition device 210.
The data acquisition device 210 transmits the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to the upper computer 3.
And the upper computer 3 processes the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to obtain the characteristics of the air pressure rear axle module assembly, namely a relation curve of air pressure and time.
Example 2:
the method for using the commercial vehicle pneumatic rear axle module assembly characteristic test system mainly comprises the following steps:
1) and (4) building a commercial vehicle air pressure rear axle module assembly characteristic test system.
2) The crystal oscillator circuit 201 provides a clock signal for the single chip microcomputer 202, so that the single chip microcomputer 202 is driven to send an analog voltage pulse signal I to the digital/analog conversion chip 205, and a driving signal is sent to the relay driving chip 205.
3) The digital/analog conversion chip 204 converts the analog voltage pulse signal I into a digital voltage pulse signal I, and sends the digital voltage pulse signal I to the electromagnetic directional valve 104.
4) The relay driving chip 205 drives the relay 206 to transmit the pulse voltage signal II to the electric proportional valve 105.
The relay driving chip 205 drives the air inlet relay 207 to transmit the pulse voltage signal III to the sample 107 and the data acquisition device 210.
The relay driver chip 205 drives the exhaust relay 208 to transmit the pulse voltage signal IV to the sample 107 and the data acquisition device 210.
5) The gas source delivers gas to the gas reservoir I103 via the gas source triplet 102.
6) The sample 107 controls the flow and velocity of the received gas in accordance with the pulsed voltage signal III.
The sample 107 controls the flow rate and speed of the exhaust gas according to the pulse voltage signal IV.
7) The air pressure sensor 209 monitors the air pressure signal of the sample 107 and transmits the air pressure signal to the data acquisition device 210.
8) The data acquisition device 210 transmits the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to the upper computer 3.
9) The upper computer 3 processes the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to obtain the characteristics of the air pressure rear axle module assembly, namely a relation curve of air pressure and time.
Testing the static characteristics of the air pressure rear axle module assembly: adjusting a manual pressure regulating valve 109 to stabilize the air pressure of the air inlet of the sample piece at the rated working pressure, opening an electromagnetic directional valve 104, adjusting an electric proportional valve 105 to slowly increase the input air pressure of a control port from zero to the rated working pressure, and recording a relation curve of the air pressure of an output port along with the change of the air pressure of the control port;
testing the dynamic characteristics of the air pressure rear axle module assembly: the air pressure sensor 209 at the output port of the sample piece 107 is connected to a data acquisition device. Adjusting a manual pressure regulating valve 109 to stabilize the air pressure of the air inlet of the sample at a rated working pressure, opening an electromagnetic directional valve 104, adjusting an electric proportional valve 105 to increase the air pressure of a control port at a speed of more than 2MPa/s, stabilizing the pressure for 1min, decreasing the air pressure of the control port at a speed of more than 2MPa/s, and recording a relation curve of the air pressure of an output port along with the change of time.
Testing the response characteristic of the air pressure rear axle module assembly: the air inlet of the sample piece 107 is inflated to the rated working pressure, the sample piece 107 is connected with a lower computer hardware control system, the controller is operated, the air pressure rear axle module assembly works in a mode of 'a pressure reduction state (t1 is 500ms) → a pressure maintaining state (t2 is 100ms) → a pressure increasing state (t3 is 500 ms)', the operation is carried out for 5 times in total, and a relation curve of the air pressure value of the sample piece output port and the time in the last operation process is recorded.
Testing the adjusting function of the air pressure rear axle module assembly: the sample 107 is inflated to a rated working pressure from the air inlet of the sample 107, the sample 107 is connected with a lower computer hardware control system, and a controller is operated to enable the air pressure rear axle module assembly to work in a mode of 'a pressure reduction state (t1 is 500ms) → a pressure holding state (t2 is 100ms) → 12 times of step pressure increasing (the pressure increasing time of each step is 12ms, the pressure holding time is 100ms) → a pressure increasing state (t3 is 400ms) → 7 times of step pressure decreasing (the pressure reducing time of each step is 22ms, the pressure holding time is 100ms) → a pressure reduction state (t4 is 500ms) → a pressure holding state (t5 is 100ms) → a pressure increasing state (t6 is 500 ms)', and simultaneously record a relation curve of the air pressure and the time of the sample output port.
Claims (4)
1. The commercial vehicle pneumatic rear axle module assembly characteristic testing system is characterized by mainly comprising a pneumatic system, a measurement and control system and an upper computer (3);
the pneumatic system simulates the air pressure environment of the air pressure rear axle module assembly;
the pneumatic system mainly comprises an air source (101), an air source triple piece (102), an air storage cylinder I (103), an electromagnetic directional valve (104), an electric proportional valve (105), an air storage cylinder II (106), a sample piece (107), an air storage cylinder III (108), a manual pressure regulating valve (109) and an air storage cylinder IV (110);
the gas source (101) transmits gas to the gas storage cylinder I (103) through a gas source triplet (102);
the air storage cylinder I (103) conveys air to an air storage cylinder II (106) through an electromagnetic directional valve (104) and an electric proportional valve (105);
the air cylinder I (103) is used for conveying air to an air cylinder IV (110) through a manual pressure regulating valve (109);
the electromagnetic directional valve (104) receives a digital voltage pulse signal I of the digital/analog conversion chip (205), so that the direction, the flow rate and the speed of gas delivered by the gas storage cylinder I (103) are controlled;
the electric proportional valve (105) receives a pulse voltage signal II of a relay (206) so as to control the flow rate and the speed of the gas delivered by the gas cylinder I (103);
the gas storage cylinder II (106) conveys gas to a sample piece (107);
the gas cylinder IV (210) is used for conveying gas to the sample piece (107);
the sample piece (107) discharges gas to the gas storage cylinder III (108);
the gas inlet valve of the sample piece (107) controls the flow and the speed of the received gas according to the pulse voltage signal III;
the gas outlet valve of the sample piece (107) controls the flow and the speed of the discharged gas according to the pulse voltage signal IV;
the measurement and control system measures the characteristics of the air pressure rear axle module assembly;
the measurement and control system mainly comprises a crystal oscillator circuit (201), a reset circuit (202), a single chip microcomputer (203), a digital/analog conversion chip (204), a relay driving chip (205), a relay (206), an air inlet relay (207), an air outlet relay (208), an air pressure sensor (209) and a data acquisition device (210)
The crystal oscillator circuit (201) provides a clock signal for the singlechip (202), so that the singlechip (202) is driven to send an analog voltage pulse signal I to the digital-to-analog conversion chip (205) and send a driving signal to the relay driving chip (205);
the reset circuit (202) resets the singlechip (203);
the digital/analog conversion chip (204) converts the analog voltage pulse signal I into a digital voltage pulse signal I and sends the digital voltage pulse signal I to the electromagnetic directional valve (104);
the relay driving chip (205) drives the relay (206) to transmit a pulse voltage signal II to the electric proportional valve (105);
the relay driving chip (205) drives the air inlet relay (207) to transmit a pulse voltage signal III to the sample piece (107) and the data acquisition device (210);
the relay driving chip (205) drives the exhaust relay (208) to transmit a pulse voltage signal IV to the sample piece (107) and the data acquisition device (210);
the air pressure sensor (209) monitors an air pressure signal of the gas discharged by the sample piece (107) and transmits the air pressure signal to the data acquisition device (210);
the data acquisition device (210) transmits the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to the upper computer (3);
and the upper computer (3) processes the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to obtain the characteristics of the air pressure rear axle module assembly, namely a relation curve of air pressure and time.
2. The system for testing the characteristics of a pneumatic rear axle module assembly of a commercial vehicle as claimed in claim 1, wherein: the sample piece (107) is an air pressure rear axle module assembly.
3. The system for testing the characteristics of the pneumatic rear axle module assembly of the commercial vehicle according to claim 1 or 2, wherein: the gas source (101), the gas source triple piece (102), the gas storage cylinder I (103), the electromagnetic directional valve (104), the electric proportional valve (105), the gas storage cylinder II (106), the sample piece (107) and the gas storage cylinder III (108) are sequentially connected through a gas pipe;
the air cylinder I (103), the manual pressure regulating valve (109), the air cylinder IV (110) and the sample piece (107) are sequentially connected through an air pipe.
4. A method for using the system for testing the characteristics of a pneumatic rear axle module assembly of a commercial vehicle according to any one of claims 1 to 3, which essentially comprises the following steps:
1) constructing a commercial vehicle pneumatic rear axle module assembly characteristic test system;
2) the crystal oscillator circuit (201) provides a clock signal for the singlechip (202), so that the singlechip (202) is driven to send an analog voltage pulse signal I to the digital-to-analog conversion chip (205) and send a driving signal to the relay driving chip (205);
3) the digital/analog conversion chip (204) converts the analog voltage pulse signal I into a digital voltage pulse signal I and sends the digital voltage pulse signal I to the electromagnetic directional valve (104);
4) the relay driving chip (205) drives the relay (206) to transmit a pulse voltage signal II to the electric proportional valve (105);
the relay driving chip (205) drives the air inlet relay (207) to transmit a pulse voltage signal III to the sample piece (107) and the data acquisition device (210);
the relay driving chip (205) drives the exhaust relay (208) to transmit a pulse voltage signal IV to the sample piece (107) and the data acquisition device (210);
5) the gas source transmits gas to the gas storage cylinder I (103) through the gas source triple piece (102);
the electric proportional valve (105) controls the flow and the speed of the gas delivered by the gas storage cylinder I (103) according to the pulse voltage signal II;
the electromagnetic directional valve (104) receives a digital voltage pulse signal I of the digital/analog conversion chip (205) so as to control the direction, flow and speed of gas delivered by the gas storage cylinder I (103);
6) the sample piece (107) controls the flow rate and the speed of the received gas according to the pulse voltage signal III;
the sample piece (107) controls the flow and the speed of the discharged gas according to the pulse voltage signal IV;
7) the air pressure sensor (209) monitors an air pressure signal of the sample piece (107) and transmits the air pressure signal to the data acquisition device (210);
8) the data acquisition device (210) transmits the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to the upper computer (3);
9) and the upper computer (3) processes the air pressure signal, the pulse voltage signal III and the pulse voltage signal IV to obtain the characteristics of the air pressure rear axle module assembly, namely a relation curve of air pressure and time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910148834.XA CN109882472B (en) | 2019-02-28 | 2019-02-28 | System and method for testing characteristics of pneumatic rear axle module assembly of commercial vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910148834.XA CN109882472B (en) | 2019-02-28 | 2019-02-28 | System and method for testing characteristics of pneumatic rear axle module assembly of commercial vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109882472A CN109882472A (en) | 2019-06-14 |
| CN109882472B true CN109882472B (en) | 2020-06-05 |
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| CN107655761A (en) * | 2017-10-30 | 2018-02-02 | 上海应用技术大学 | Rupture disk pressure release test system and method |
| CN107782561A (en) * | 2016-08-25 | 2018-03-09 | 张桂春 | A kind of aircraft brake assemblies intelligent testing test stand |
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| US4598579A (en) * | 1984-10-23 | 1986-07-08 | Cordis Corporation | Portable instrument to test pressure/flow of ventricular shunt valves |
| JP3513096B2 (en) * | 2000-09-25 | 2004-03-31 | トヨタ自動車株式会社 | Accumulator and abnormality detection device for accumulator |
| CN202442083U (en) * | 2012-02-07 | 2012-09-19 | 黄成良 | Centralized lubrication system of oil pumping unit |
| CN102607960B (en) * | 2012-04-16 | 2013-10-02 | 公安部天津消防研究所 | Measurement and control system for hydraulic test |
| CN203298937U (en) * | 2013-05-20 | 2013-11-20 | 苏州锦鹏机电设备制造有限公司 | Valve test pressure source |
| CN108120606B (en) * | 2018-01-29 | 2019-04-05 | 吉林大学 | Commercial vehicle electric brake system hardware-in-the-loop test platform and test method based on PXI and cRIO controller |
| CN108107876B (en) * | 2018-01-29 | 2018-11-27 | 吉林大学 | Commercial vehicle electric brake system hardware-in-the-loop test platform and test method based on TTC580 controller |
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| CN107782561A (en) * | 2016-08-25 | 2018-03-09 | 张桂春 | A kind of aircraft brake assemblies intelligent testing test stand |
| CN107655761A (en) * | 2017-10-30 | 2018-02-02 | 上海应用技术大学 | Rupture disk pressure release test system and method |
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