Application in the detection device of control performance index of electrorheological damper

Abstract

The present invention provides a control performance index detection device for electrorheological damper, including a host computer, a DC high voltage generator, a multifunctional data acquisition module, an anti-surge and a mechanical device test platform, the anti-surge is connected to an external voltage source, and the 24V DC voltage provided by the voltage source is transmitted to the DC high voltage generator, and the DC high voltage generator generates a 0-20kV DC high voltage output according to the DC 24V voltage transmitted by the anti-surge under the control of the host computer, and the multifunctional data acquisition module controls and collects data on the mechanical device test platform under the control of the host computer, and the mechanical device test platform performs an electrorheological fluid damping performance test under the control of the multifunctional data acquisition module. The present invention realizes that different voltage yield stress, response time, shear stress, electrorheological efficiency, and response time of electrorheology are equal to actual application performance indicators.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorber detection, and in particular to a control performance index detection device for an electrorheological shock absorber. Background Art

[0002] Electrorheological fluid is a type of colloid composed of dielectric particles suspended in a non-conductive continuous phase. When an electric field of a certain intensity is applied to the electrorheological fluid, its rheological properties will change immediately, from liquid to solid-like state. When the electric field is removed, it will immediately return to the original liquid. Electrorheological fluid has the following characteristics in the electric field: (1) It can quickly convert between liquid and solid-like, that is, the apparent viscosity can change greatly under static or low shear rate, and it has the shear resistance of solid properties; (2) This liquid-solid conversion is reversible; (3) This conversion is controllable, only the electric field signal needs to be controlled; (4) This change in apparent viscosity changes continuously with the change of electric field intensity; (5) This change can be completed within milliseconds, with extremely high response speed; (6) The energy to control this phase change is extremely low. These excellent properties make it an important artificial intelligence material and a very promising smart material in high-efficiency mechatronics. It has broad engineering application prospects in mechanical engineering, automotive industry, construction field, aerospace and other fields.

[0003] Using electrorheological dampers, combined with an optimized control system, can flexibly control the performance of the vehicle suspension to meet various road conditions. The yield stress, shear stress, zero-field viscosity, electrorheological efficiency, response time, shear stability parameters of electrorheological fluids are completed by special testing agencies. However, to fully understand the specific performance of electrorheological fluids, a control system device needs to be built. At present, electrorheology has been used in civilian fields such as bicycle shock absorbers, and other industries are studying its use. However, to apply electrorheology to shock absorbers, it is not enough to only know its inherent performance, and actual simulation tests must be carried out. The conventional electrorheological shock absorber detection device consists of a digital pressure gauge, a high-voltage generator, a displacement sensor, a data parameter collector, and a computer management system. However, the system composed of this cannot obtain the control performance indicators of electrorheology. The reason is that the pressure gauge has a long response time, the pressure difference and voltage relationship before and after the throttle valve cannot be described, and the description of the synchronization of various parameters or the change of intervals over time cannot be achieved. The data acquisition card currently on the market cannot meet the signal acquisition requirements of the device. In order to correctly describe the various control performances of the electrorheological device, an overall unified design must be carried out so that the system can perform various possible tests to describe the electrorheological performance, especially the relationship between the electrorheological device and the voltage and the response time of different voltages. To this end, we have invented a new device for detecting the control performance index of the electrorheological damper, which solves the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to provide a control performance index detection device for electrorheological dampers, which can realize the yield stress, response time, shear stress, electrorheological efficiency and response time under different electrorheological voltage conditions, which are equal to the actual application performance indexes.

[0005] The object of the present invention can be achieved through the following technical measures: an electrorheological damper control performance index detection device is applied, and the electrorheological damper control performance index detection device includes a host computer, a DC high-voltage generator, a multifunctional data acquisition module, a surge protection device and a mechanical device test platform. The surge protection device is connected to the DC high-voltage generator and is externally connected to a voltage source, and transmits a 24V DC voltage provided by the voltage source to the DC high-voltage generator. The DC high-voltage generator is connected to the host computer, and under the control of the host computer, a 0-20kV DC high-voltage output is generated according to the DC 24V voltage transmitted by the surge protection device. The multifunctional data acquisition module is connected to the DC high-voltage generator and the host computer. Under the control of the host computer, the multifunctional data acquisition module controls and collects data on the mechanical device test platform. The mechanical device test platform is connected to the DC high-voltage generator and the multifunctional data acquisition module, and an electrorheological fluid damping performance test is performed under the control of the multifunctional data acquisition module.

[0006] The purpose of the present invention can also be achieved by the following technical measures:

[0007] The mechanical device test platform includes an accumulator, an electric valve, a damper and an oil cylinder. The electric valve is connected to the accumulator, and the damper is connected between the oil cylinder and the electric valve. When the electric valve is opened, the liquid in the accumulator enters the oil cylinder through the damper under the compressed air pressure inside the accumulator. The pressure of the oil cylinder pushes the piston to move, and the pressure or displacement is controlled by the damper.

[0008] The mechanical device test platform comprises a hydraulic station, which is connected to the oil cylinder to balance the pressure from the pipeline.

[0009] The DC high-voltage generator includes an anti-interference isolation circuit, an MCU control core circuit, a waveform generation and PWM width modulation circuit, a high-voltage drive circuit, a high-voltage package, a forward diode and a thyristor. The anti-interference isolation circuit is connected to the discharge surge, receives a DC 24V voltage, and converts the 24V voltage into voltages of various levels required by the MCU control core circuit. The MCU control core circuit is connected to the anti-interference isolation circuit, and outputs corresponding PWM pulses according to the command of the host computer. The waveform generation and PWM width modulation circuit is connected to the MCU control core circuit, and the PWM pulse signal output by the MCU control circuit is processed into a smooth AC waveform. The high-voltage drive circuit is connected to the waveform generation and PWM width modulation circuit and connected to the primary coil of the high-voltage package, and drives the primary coil of the high-voltage package according to the AC waveform transmitted by the waveform generation and PWM width modulation circuit, so as to generate high voltage in the secondary coil of the high-voltage package. The forward diode is connected to the secondary coil of the high-voltage package, and the AC high voltage output by the high-voltage package is rectified to generate high voltage. The thyristor is connected to the forward diode to output the high voltage transmitted by the forward diode.

[0010] The DC high voltage generator also includes a first RS485 interface circuit, which is connected to the MCU control core circuit and is externally connected to the host computer to transmit command signals of the host computer.

[0011] The DC high-voltage generator also includes a high-voltage detection circuit and a calibration and sampling circuit. The high-voltage detection circuit is connected to the output end of the forward diode to detect the high-voltage value output by the forward diode. The calibration and sampling circuit is connected to the high-voltage detection circuit and the MCU control core circuit to collect the divided voltage signal of the DC high voltage output by the forward diode and transmit it to the MCU control core circuit for conversion to obtain the high-voltage value.

[0012] The DC high voltage generator also includes a high voltage output control circuit, which is connected to the MCU control core circuit and the control end of the thyristor to control the output time of the rectified high voltage, and the output time is determined by the host computer command or program process requirements.

[0013] The MCU control core circuit adopts STM32F digital controller.

[0014] The multifunctional data acquisition module comprises a high-voltage value acquisition circuit, a pressure acquisition circuit before the throttle valve, a pressure acquisition circuit after the throttle valve, a cylinder displacement signal acquisition circuit, a synchronous A / D acquisition chip and a digital controller. The high-voltage value acquisition circuit is connected to the DC high-voltage generator to acquire the high-voltage value output by the DC high-voltage generator and send the acquired high-voltage value to the synchronous A / D acquisition chip. The pressure acquisition circuit before the throttle valve is connected to the mechanical device test platform to acquire the pressure before the throttle valve in the mechanical device test platform and send the acquired pressure value before the throttle valve to the synchronous A / D acquisition chip. The pressure acquisition circuit after the throttle valve is connected to the mechanical device test platform to acquire the pressure after the throttle valve in the mechanical device test platform and send the acquired pressure value after the throttle valve to the synchronous A / D acquisition chip. The cylinder displacement signal acquisition circuit is connected to the mechanical device test platform, collects the displacement value of the cylinder in the mechanical device test platform, and sends the collected displacement value of the cylinder to the synchronous A / D acquisition chip. The synchronous A / D acquisition chip is connected to the high-voltage value acquisition circuit, the pressure acquisition circuit before the throttle valve, the pressure acquisition circuit after the throttle valve and the cylinder displacement signal acquisition circuit, performs analog-to-digital conversion on the collected high-voltage value, the pressure value before and after the throttle valve and the cylinder displacement value, and sends the signal value after the analog-to-digital conversion to the digital controller. The digital controller starts the signal acquisition time according to the pre-set sampling rules, obtains the sampling data through the parallel port, processes the sampling data, and sends the control command according to the host computer and the test process requirements to realize the electric valve start and stop signal output of the mechanical device test platform.

[0015] The multifunctional data acquisition module also includes a first photoelectric isolation circuit and a second RS485 interface circuit, the second RS485 interface circuit is connected to the host computer, the first photoelectric isolation circuit is connected to the digital controller, the sampled data after data processing is transmitted to the host computer through the second RS485 interface circuit, and the command signal of the host computer transmitted by the second RS485 interface circuit is received.

[0016] The multifunctional data acquisition module also includes a second photoelectric isolation circuit and an electric valve control circuit. The first photoelectric isolation circuit is connected to the digital controller and transmits the start and stop signal to the electric valve control circuit to control the start and stop of the electric valve of the mechanical device test platform.

[0017] The multifunctional data acquisition module also includes a power supply module, which supplies power to the circuits in the multifunctional data acquisition module, including voltage modules 85D-24D12RAC, 7805, 7905, and LM117. The voltage module 85D-24D12RAC is externally connected to a 24V voltage source and generates a DC 12V voltage. The voltage module 7805 is connected to the voltage module 85D-24D12RAC and generates a +5V power supply based on the DC 12V voltage. The voltage module 7905 is connected to the voltage module 85D-24D12RAC and generates a -5V power supply based on the DC 12V voltage. The voltage module LM117 is connected to the voltage module 7805 and generates a 3.3V power supply based on the DC +5V voltage.

[0018] The pressure acquisition circuit before the throttle valve includes a first silicon piezoresistive pressure sensor, a first Wheatstone bridge, a first constant current source, a first filtering network and a first instrument amplifier. The first Wheatstone bridge is connected to the first silicon piezoresistive pressure sensor to convert the resistance signal transmitted by the first silicon piezoresistive pressure sensor into a voltage signal for measurement. The first constant current source is connected to the first Wheatstone bridge to supply power to the first Wheatstone bridge. The first filtering network is connected to the first Wheatstone bridge to filter the voltage signal. The first instrument amplifier is connected to the first filtering network to amplify the filtered voltage signal.

[0019] The post-throttle pressure acquisition circuit includes a second silicon piezoresistive pressure sensor, a second Wheatstone bridge, a second constant current source, a second filtering network and a second instrument amplifier. The second Wheatstone bridge is connected to the second silicon piezoresistive pressure sensor to convert the resistance signal transmitted by the second silicon piezoresistive pressure sensor into a voltage signal for measurement. The second constant current source is connected to the second Wheatstone bridge to supply power to the second Wheatstone bridge. The second filtering network is connected to the second Wheatstone bridge to filter the voltage signal. The second instrument amplifier is connected to the second filtering network to amplify the filtered voltage signal.

[0020] The high-voltage value acquisition circuit includes a voltage divider circuit, a third filtering network and a third instrument amplifier. The voltage divider circuit divides and reduces the voltage of the high-voltage signal output by the DC high-voltage generator. The third filtering network is connected to the voltage divider circuit to filter the divided high-voltage signal. The third instrument amplifier is connected to the third filtering network to amplify the filtered high-voltage signal.

[0021] The oil cylinder displacement signal acquisition circuit adopts a magnetostrictive displacement sensor, which outputs a 0-5V signal.

[0022] The synchronous A / D acquisition chip uses the AD7656 chip.

[0023] The digital controller uses the STM32F407 chip.

[0024] The control performance index detection device for electrorheological shock absorber in the present invention is composed of a protective high-voltage generator, a damping shock absorber test platform, a multifunctional data acquisition module, a host computer control system, etc. It realizes the different voltage yield stress, response time, shear stress, electrorheological efficiency, and response time of electrorheological shock absorber, which are equal to the actual application performance index, and lays a solid foundation for establishing a control model of vibration damping of automobile shock absorption system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of a specific embodiment of the present invention applied to the control performance index detection device of the electrorheological damper;

[0026] Figure 2 It is a structural diagram of a mechanical device test platform in a specific embodiment of the present invention;

[0027] Figure 3 It is a structural diagram of a DC high voltage generator in a specific embodiment of the present invention;

[0028] Figure 4 It is a structural diagram of a multifunctional data acquisition module in a specific embodiment of the present invention;

[0029] Figure 5 A circuit diagram of a power supply module in a multifunctional data acquisition module in a specific embodiment of the present invention;

[0030] Figure 6 A circuit diagram of a reference circuit and a constant current source used in a pressure collection circuit before and after a throttle valve in a multifunctional collection module in a specific embodiment of the present invention;

[0031] Figure 7 It is a circuit diagram of a pressure signal amplifying circuit used in a pressure collection circuit before and after a throttle valve in a multifunctional collection module in a specific embodiment of the present invention;

[0032] Figure 8 A circuit diagram of a high voltage value acquisition circuit in a multifunctional acquisition module in a specific embodiment of the present invention;

[0033] Fig. 9 It is a circuit diagram of a cylinder displacement signal acquisition circuit in a multifunctional acquisition module in a specific embodiment of the present invention;

[0034] Fig.10 A circuit diagram of a synchronous A / D acquisition chip in a multifunctional acquisition module in a specific embodiment of the present invention;

[0035] Fig.11 The circuit diagram of the digital controller in the multifunctional acquisition module in a specific embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

[0037] like Figure 1 As shown, Figure 1 The structure diagram of the control performance index detection device for electrorheological damper of the present invention is composed of a host computer 1, a DC high voltage generator 2, a multifunctional data acquisition module 3, a surge protection 4 and a mechanical device test platform 5.

[0038] The surge protection device 4 is externally connected to a voltage source for independently transmitting a voltage boost, and transmits the 24V DC voltage provided by the voltage source to the DC high voltage generator 2 .

[0039] The DC high voltage generator 2 is connected to the surge discharger 4, and generates a 0-20 kV DC high voltage output according to the DC 24 V voltage transmitted from the surge protection 4. The DC high voltage generator 2 mainly generates high voltage values ​​of different levels for controlling the electrorheological fluid to obtain its damping characteristics.

[0040] The host computer 1 is connected to the DC high voltage generator 2 , and the host computer 1 controls the voltage boost amplitude and high voltage output of the DC high voltage generator 2 .

[0041] The multifunctional data acquisition module 3 is connected to the DC high voltage generator 2 and the host computer 1 . Under the control of the host computer 1 , the multifunctional data acquisition module 3 controls and acquires data from the mechanical device test platform 5 .

[0042] The mechanical device test platform 5 is connected to the DC high voltage generator 2 and the multifunctional data acquisition module 3 , and performs an electrorheological fluid damping performance test under the control of the multifunctional data acquisition module 3 .

[0043] In one embodiment, a mechanical device test platform such as Figure 2 As shown. The mechanical device test platform includes an accumulator 51, an electric valve 52, a damper 53, a cylinder 54 and a hydraulic station 55. The electric valve 52 is connected to the accumulator 51, the damper 53 is connected between the cylinder 54 and the electric valve 52, and the hydraulic station 55 is connected to the cylinder 54. When the electric valve 52 is opened, the liquid in the accumulator 51 passes through the damper 53 and enters the cylinder 54 under the pressure of the compressed air inside the accumulator 51, and the pressure of the cylinder 54 pushes the piston to move. The size of the pressure or displacement is controlled by the damper 53 (throttle valve). The hydraulic station 55 is connected to the cylinder 54, and its buffering pressure acts as a reverse pressure, always balancing the pressure from the pipeline, which is equivalent to the load.

[0044] If the liquid in the accumulator 51, pipeline and cylinder 54 is electrorheological fluid, then by applying high pressure to the damper 54, the state of the electrorheological fluid is changed - liquid-solid transition, which plays the role of a throttle valve, and the pressure and displacement of the cylinder can be controlled, thereby realizing the damping performance test of the electrorheological fluid.

[0045] The principle block diagram of the DC high voltage generator is as follows: Figure 3 As shown. The DC high voltage generator is powered by 24V DC and generates 0-20kV DC high voltage output. The DC high voltage generator consists of an anti-interference isolation circuit 21, an MCU control core circuit 22, a waveform generation and PWM width modulation circuit 23, a high voltage drive circuit 24, a forward diode D1, a thyristor D2, a high voltage detection circuit 25, a high voltage output control circuit 26, a first RS485 interface circuit 27, a calibration and sampling circuit 28 and a high voltage package 29.

[0046] The anti-interference isolation circuit 21 is connected to the surge protector 4 , receives a DC 24V voltage, and converts the 24V voltage into voltages of various levels required by the MCU control core circuit 22 .

[0047] The MCU control core circuit 22 is connected to the anti-interference isolation circuit 21, and outputs corresponding PWM pulses according to the command of the host computer to generate corresponding high voltage values. In one embodiment, the MCU control core circuit 22 adopts an STM32F digital controller.

[0048] The waveform generation and PWM width modulation circuit 23 is connected to the high-voltage driving circuit 24, and processes the PWM pulse signal output by the MCU control circuit 22 into a smooth AC waveform.

[0049] The high voltage driving circuit 24 is connected to the primary coil of the high voltage package and drives the primary coil of the high voltage package to generate high voltage in the secondary coil.

[0050] The forward diode D1 is connected to the secondary coil of the high-voltage package. The high voltage output from the high-voltage package is AC. The diode is used for rectification to generate rectified high voltage, which is output through the thyristor D2.

[0051] The high voltage detection circuit 25 is connected to the forward diode D1 to detect the high voltage value output by the forward diode D1 .

[0052] The high voltage output control circuit 26 is connected to the thyristor control terminal of the DC high voltage output to control the output time of the high voltage. The output time is determined by the host computer command or program process requirements.

[0053] The first RS485 interface circuit 27 is connected to the upper management computer to transmit the upper computer command signal

[0054] The calibration and sampling circuit 28 is connected to the high-voltage detection circuit 25, output to the MCU, and collects the high-voltage voltage-divided signal, which enters the MCU for conversion to obtain the high-voltage value. The calibration signal has a standard signal, which is equivalent to a predetermined voltage value. In one embodiment, the voltage needs to be sampled, and the resistance of the sampling circuit changes after a period of time, which will produce errors. In this embodiment, the same circuit is pre-built and used as a standard to calibrate the voltage value to be collected. When the calibration circuit changes, the change coefficient K of the calibration circuit is obtained = X / X0, X is the current collected value, X0 is the factory test value, then the actual voltage value collected = V / K.

[0055] Working principle: STM32F digital control generates high-frequency PWM pulse waves, converting DC 24V into AC of the same frequency, which is coupled to the primary coil through high voltage to generate high voltage. The high voltage is converted into DC high voltage through the forward diode. At the same time, the high voltage is divided and collected in real time by the digital controller through the sampling circuit. The digital control power supply of the high voltage generator adopts an isolated power supply.

[0056] In one embodiment, the functional block diagram of the multifunctional data acquisition module is as follows: Figure 4 The multifunctional data acquisition module includes a synchronous A / D acquisition chip 31, a digital controller 32, a high-voltage value acquisition circuit 33, a throttle valve front pressure acquisition circuit 34, a throttle valve rear pressure acquisition circuit 35, a cylinder displacement signal acquisition circuit 36, a first photoelectric isolation circuit 37, a second RS485 interface circuit 38, a second photoelectric isolation circuit 39 and an electric valve control circuit 40 of a mechanical device test platform.

[0057] The high voltage value acquisition circuit 33 is connected to the DC high voltage generator, acquires the high voltage value output by the DC high voltage generator, and sends the acquired high voltage value to the synchronous A / D acquisition chip 31 .

[0058] The pressure before the throttle valve acquisition circuit 34 is connected to the mechanical device test platform, collects the pressure before the throttle valve in the mechanical device test platform, and sends the collected pressure value before the throttle valve to the synchronous A / D acquisition chip 31.

[0059] The post-throttle valve pressure acquisition circuit 35 is connected to the mechanical device test platform, collects the pressure behind the throttle valve in the mechanical device test platform, and sends the collected post-throttle valve pressure value to the synchronous A / D acquisition chip 31.

[0060] The oil cylinder displacement signal acquisition circuit 36 ​​is connected to the mechanical device test platform, collects the displacement value of the oil cylinder in the mechanical device test platform, and sends the collected displacement value of the oil cylinder to the synchronous A / D acquisition chip 31 .

[0061] The synchronous A / D acquisition chip 31 is connected to the high-voltage value acquisition circuit 33, the pressure acquisition circuit before the throttle valve 34, the pressure acquisition circuit after the throttle valve 35 and the cylinder displacement signal acquisition circuit 36, and performs analog-to-digital conversion on the collected high-voltage value, the pressure value before and after the throttle valve and the cylinder displacement value, and sends the signal value after the analog-to-digital conversion to the digital controller 32.

[0062] The digital controller 32 starts the acquisition time of the 6-channel signal according to the preset sampling rules, obtains the sampling data through the parallel port, processes the sampling data, and controls the opening of the pipeline valve of the test equipment according to the test process requirements.

[0063] The first photoelectric isolation circuit 37 transmits the high and low level signals of the serial port's receiving and sending data to the communication channel in the form of light. The first photoelectric isolation circuit 37 receives the host computer data command, data exchange, including sampling signals.

[0064] The second RS485 interface circuit 38 uploads the data to the upper management computer.

[0065] The second photoelectric isolation circuit 39 outputs a switching signal through the photoelectric isolation chip.

[0066] The electric valve control circuit 40 is connected to the control port of the control circuit of the electromagnetic valve, and controls the electromagnetic valve according to the command of the host computer and the test process.

[0067] The outstanding feature is that the synchronous acquisition of 6 analog channels is achieved by controlling the three synchronous control terminals A, B, and C of AD7656. In order to describe in detail the characteristics of the damping of the electrorheological fluid changing with voltage, a comprehensive description can be achieved by collecting four signals: high voltage value, pressure before and after the throttle valve, and cylinder displacement signal. The acquisition of these four signals can be synchronized or collected at intervals of a certain time, and the time interval can be set arbitrarily by the host computer.

[0068] The four signals, high pressure value U, pressure before throttle valve (P1), pressure after throttle valve (P2), and cylinder displacement signal (S), can be combined in five ways. The combination forms are as follows: (1) The four signals U, P1, P2, and S can all be collected synchronously; (2) The three groups of U and P1, P1 and P2, and P2 and S can be collected synchronously and cannot be separated; (3) P1 and P2 can be collected synchronously or asynchronously at a specified time interval; (4) U and P1 can be collected synchronously and asynchronously; (5) P2 and S can be collected synchronously and asynchronously.

[0069] Through these five modes, the damping characteristics of the throttle valve and its relationship with the voltage can be described. The synchronous acquisition chip AD7656 is controlled by the numerical controller STM32F407, and the two data are transmitted through the parallel interface. The module is connected to the computer through RS485, which can modify parameters and transmit data. The module can control the test start and stop of the mechanical device.

[0070] In one embodiment, the electronic circuit of the multifunctional data acquisition module is as follows: Figure 5-11 As shown. Figure 5 As shown, the multifunctional data acquisition module includes a power module, which is composed of a voltage module 85D-24D12RAC, 7805, 7905, and LM117. The voltage module 85D-24D12RAC generates a DC 12V, which is passed through 7805 and 7905 to generate a DC ±5V power supply to power the components of the electronic circuit; LM117 generates a 3.3V power supply to power the digital controller.

[0071] like Figure 6 and 7 As shown in the figure, the pressure acquisition circuit before and after the throttle valve uses the silicon piezoresistive pressure sensor BYP100. The strain gauge type is a linear change in resistance with external pressure, which can be measured by converting it into voltage using a Wheatstone bridge. The bridge circuits before and after the throttle valve are composed of R7, R8, R9, R10; R15, R16, R17, and R18 respectively. The bridge is powered by a constant current source. The calibration voltage of the constant current source is REF2925, and the constant current source chip is composed of DPA335. For the sake of reliability, two constant current sources are used to supply two bridge circuits respectively. The signal output capacitors C22, C23, C24, C25, C26 of the bridge and R11, R12, and R13 form a filter network for effective filtering, and then amplified by the instrument amplifier AD620, and the signal enters the data synchronization acquisition chip AD7656. The pressure acquisition circuit after the throttle valve is similar.

[0072] like Figure 8 As shown, the high-voltage value acquisition circuit adopts a voltage divider circuit, and the signal processing method is similar to the processing of the pressure signal before the throttle valve.

[0073] like Fig. 9 As shown, the oil cylinder displacement signal acquisition circuit adopts a magnetostrictive displacement sensor, which outputs a 0-5V signal and can be directly connected to the data synchronization acquisition chip AD7656.

[0074] like Fig.10As shown in the figure, the digital synchronous acquisition chip AD7656 is an analog-to-digital converter with independent six-channel successive approximation (SAR). The conversion process and data accuracy are controlled by the CONVST signal and an internal crystal oscillator. The three CONVST pins allow three channels to independently and synchronously sample the ADC. When the three CONVST pins are connected together, six channels can be sampled synchronously. The AD7656 is connected in parallel with the digital processor STM32F407 at high speed.

[0075] like Fig.11 As shown, the digital controller STM32F407 has many output interfaces, and one of them is selected as the control signal output for opening the solenoid valve.

Claims

1. Applied to the electrorheological damper control performance index detection device, characterized in that: The control performance index detection device for electrorheological damper comprises a host computer, a DC high voltage generator, a multifunctional data acquisition module, an anti-surge and a mechanical device test platform. The anti-surge is connected to the DC high voltage generator and is externally connected to a voltage source. The 24V DC voltage provided by the voltage source is transmitted to the DC high voltage generator. The DC high voltage generator is connected to the host computer. Under the control of the host computer, a 0-20kV DC high voltage output is generated according to the DC 24V voltage transmitted by the anti-surge. The multifunctional data acquisition module is connected to the DC high voltage generator and the host computer. Under the control of the host computer, the multifunctional data acquisition module controls and collects data on the mechanical device test platform. The mechanical device test platform is connected to the DC high voltage generator and the multifunctional data acquisition module. Under the control of the multifunctional data acquisition module, an electrorheological fluid damping performance test is performed. The mechanical device test platform includes an accumulator, an electric valve, a damper and an oil cylinder. The electric valve is connected to the accumulator, and the damper is connected between the oil cylinder and the electric valve. When the electric valve is opened, the liquid in the accumulator enters the oil cylinder through the damper under the pressure of the compressed air inside the accumulator. The pressure of the oil cylinder pushes the piston to move, and the pressure or displacement is controlled by the damper. The DC high-voltage generator includes an anti-interference isolation circuit, an MCU control core circuit, a waveform generation and PWM width modulation circuit, a high-voltage drive circuit, a high-voltage package, a forward diode and a thyristor. The anti-interference isolation circuit is connected to the surge protection circuit, receives a DC 24V voltage, and converts the 24V voltage into voltages of various levels required by the MCU control core circuit. The MCU control core circuit is connected to the anti-interference isolation circuit, and outputs corresponding PWM pulses according to the command of the host computer. The waveform generation and PWM width modulation circuit is connected to the MCU control core circuit, and the PWM pulse signal output by the MCU control core circuit is processed into a smooth AC waveform. The high-voltage drive circuit is connected to the waveform generation and PWM width modulation circuit and connected to the primary coil of the high-voltage package, and drives the primary coil of the high-voltage package according to the AC waveform transmitted by the waveform generation and PWM width modulation circuit, so as to generate high voltage in the secondary coil of the high-voltage package. The forward diode is connected to the secondary coil of the high-voltage package, and the AC high voltage output by the high-voltage package is rectified to generate high voltage. The thyristor is connected to the forward diode to output the high voltage transmitted by the forward diode.

2. The control performance index detection device for electrorheological damper according to claim 1 is characterized in that: The mechanical device test platform also includes a hydraulic station, which is connected to the oil cylinder to balance the pressure from the pipeline.

3. The control performance index detection device for electrorheological damper according to claim 1 is characterized in that: The DC high voltage generator also includes a first RS485 interface circuit, which is connected to the MCU control core circuit and is externally connected to the host computer to transmit command signals of the host computer.

4. The control performance index detection device for electrorheological damper according to claim 1 is characterized in that: The DC high-voltage generator also includes a high-voltage detection circuit and a calibration and sampling circuit. The high-voltage detection circuit is connected to the output end of the forward diode to detect the high-voltage value output by the forward diode. The calibration and sampling circuit is connected to the high-voltage detection circuit and the MCU control core circuit to collect the divided voltage signal of the DC high voltage output by the forward diode and transmit it to the MCU control core circuit for conversion to obtain the high-voltage value.

5. The control performance index detection device for electrorheological damper according to claim 1 is characterized in that: The DC high voltage generator also includes a high voltage output control circuit, which is connected to the MCU control core circuit and the control end of the thyristor to control the output time of the rectified high voltage, and the output time is determined by the host computer command or program process requirements.

6. The control performance index detection device for electrorheological damper according to claim 1 is characterized in that: The MCU control core circuit adopts STM32F digital controller.

7. The control performance index detection device for electrorheological damper according to claim 1 is characterized in that: The multifunctional data acquisition module comprises a high-voltage value acquisition circuit, a pressure acquisition circuit before the throttle valve, a pressure acquisition circuit after the throttle valve, a cylinder displacement signal acquisition circuit, a synchronous A / D acquisition chip and a digital controller. The high-voltage value acquisition circuit is connected to the DC high-voltage generator to acquire the high-voltage value output by the DC high-voltage generator and send the acquired high-voltage value to the synchronous A / D acquisition chip. The pressure acquisition circuit before the throttle valve is connected to the mechanical device test platform to acquire the pressure before the throttle valve in the mechanical device test platform and send the acquired pressure value before the throttle valve to the synchronous A / D acquisition chip. The pressure acquisition circuit after the throttle valve is connected to the mechanical device test platform to acquire the pressure after the throttle valve in the mechanical device test platform and send the acquired pressure value after the throttle valve to the synchronous A / D acquisition chip. The cylinder displacement signal acquisition circuit is connected to the mechanical device test platform, collects the displacement value of the cylinder in the mechanical device test platform, and sends the collected displacement value of the cylinder to the synchronous A / D acquisition chip. The synchronous A / D acquisition chip is connected to the high-voltage value acquisition circuit, the pressure acquisition circuit before the throttle valve, the pressure acquisition circuit after the throttle valve and the cylinder displacement signal acquisition circuit, performs analog-to-digital conversion on the collected high-voltage value, the pressure value before and after the throttle valve and the cylinder displacement value, and sends the signal value after the analog-to-digital conversion to the digital controller. The digital controller starts the signal acquisition time according to the pre-set sampling rules, obtains the sampling data through the parallel port, processes the sampling data, and sends the control command according to the host computer and the test process requirements to realize the electric valve start and stop signal output of the mechanical device test platform.

Images