CN201145640Y - ABS system wheel velocity signal generator - Google Patents
ABS system wheel velocity signal generator Download PDFInfo
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- CN201145640Y CN201145640Y CNU2007201715702U CN200720171570U CN201145640Y CN 201145640 Y CN201145640 Y CN 201145640Y CN U2007201715702 U CNU2007201715702 U CN U2007201715702U CN 200720171570 U CN200720171570 U CN 200720171570U CN 201145640 Y CN201145640 Y CN 201145640Y
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Abstract
The utility model discloses a wheel speed signal generating device of an ABS system. The wheel speed signal generating device comprises a central processing unit, a wheel speed acquisition unit, a wheel speed playback unit, a data storage unit and a state control unit; and the wheel speed collection unit, the wheel speed playback unit, the data storage unit and the state control unit are respectively connected with the central processing unit. The device is applied, can preacquire the road information of different road conditions by the wheel speed acquisition unit through one or finite times of road experiments; an acquired wheel speed signal is processed and stored in the data storage unit and can be repeatedly played for a plurality of times; the playback wheel speed signal reappears the actual road information by the direct digital waveform synthesis technology and is provided to the ABS for test and experiment, thereby improving the reutilization rate of road experimental data and the development efficiency and avoiding the danger which probably occur in the actual road condition when the ABS carries out testing.
Description
[technical field]
The utility model relates to signal processing apparatus, relates in particular to a kind of signal generation apparatus of the ABS of can be applicable to system research and development.
[background technology]
ABS is a kind of safety shut-down control system with advantages such as anti-skidding, anti-lockings, and in order to guarantee ride safety of automobile, ABS is used widely on automobile.The automobile of ABS system is not installed,, is had little time that substep is slow to be stopped, can only step on to die by a pin in case of emergency, the easy locking of wheel at this moment, the spurt inertia of vehicle in addition, unsafe condition such as just may break away, sideslip, direction are uncontrolled.And the automobile of ABS is installed, when wheel was about to arrive next locked-up point, brake can act in one second 60 to 120 times, was equivalent to ceaselessly brake, loosen, promptly similar in appearance to " point is stopped " of machinery; Therefore, ABS is installed can avoids direction out of control and wheel side sliding when emergency brake, make wheel when brake not by locked, tire not on a point with ground friction, strengthened friction force, braking efficiency reaches more than 90%.Can beat direction when the main effect of another of ABS is braking and hide obstacle.Therefore, adopting ABS not only can improve vehicle braked usefulness, and can keep the handling maneuver ability, is a kind of automobile active safety technology.
ABS generally is made up of speed probe, electronic control unit (ECU) and braking valve body three big parts.Wherein wheel speed sensors generally is a variable-reluctance transducer, and the variation that can read wheel speed/gear ring is the information induction element of ABS control system.In Motor Vehicle Braking Procedure, resistance, road surface moment of torsion, braking torque can change very fast, the ABS system reads each wheel speed, and controls the brake pressure of adjusting each tire independently in the very short time (millisecond), prevents because the security incident that wheel lock up produced.
In ABS development and ABS System Functional Test process, adopt the method for actual road test usually, by the ABS parts are assemblied on the automobile, on the special purpose vehicle testing track, carry out brake test, with the driver feel judge whether the work of ABS normal.Adopt such actual road test can truly reflect the implementation status of automobile ABS, still, the construction cost height of testing track is tested the automobile test run person who needs specialty; In addition, because particular job environment of ABS is normally corrected braking state, ahead of time to prevent the appearance of peril when vehicle is about to cause danger.Therefore, also do not have full maturity for the development of ABS before, such experiment is breakneck, Shi Yan expense is also quite expensive each time, like this development phase of ABS in a large number repeatedly experiment will be worthless.Application number is CN200520061283, in the Chinese patent " device for detecting performance of anti-lock braking system in automobiles and controller thereof " in open day on June 8th, 2006, the device for detecting performance and the detection method of a kind of anti-lock braking system in automobiles and controller thereof are disclosed, this device can be realized road analogy and braking control, can develop and detect the ABS system performance, but all need the participation of abs braking system in the whole process, that is: when gathering wheel speed, also be in the presence of abs braking system, to gather, and the signal that this device is gathered can not recover and discharge in output fully, therefore experimentation cost height not only, and simulate the simple sinusoidal signal that changes with wheel speed and actual difference simply greatly, too idealized, often the ECU that test is good in the laboratory can go wrong when being applied to actual road conditions.
[summary of the invention]
Technical problem to be solved in the utility model is: the problems referred to above that overcome the development process existence of ABS, a kind of telltale of simulating true road conditions is provided, this device can be gathered the road information on the different road conditions in advance, and the information of the different roads of being gathered can repeatedly repeat playback.
In order to solve the problems of the technologies described above, the utility model proposes a kind of ABS system wheel speed signal generating means, comprise CPU (central processing unit), wheel speed collecting unit, wheel speed playback unit, data storage cell and status unit; Described wheel speed collecting unit, wheel speed playback unit, data storage cell and status unit are connected with described CPU (central processing unit) respectively.
Above-mentioned ABS system wheel speed signal generating means, described wheel speed collecting unit comprises some wheel speed acquisition modules; Described wheel speed acquisition module comprises programmable logic controller (PLC), data buffer, analog to digital converter and prime amplifier; The input end and the CPU (central processing unit) of described programmable logic controller (PLC) are joined, and its control end joins with analog to digital converter and data buffer respectively; Described prime amplifier output terminal and described analog to digital converter input end join; Described analog to digital converter output terminal and described data buffer input end join; Described data buffer is read end and is joined with described CPU (central processing unit).
Above-mentioned ABS system wheel speed signal generating means, described wheel speed playback unit comprises some wheel speed playback module; Described wheel speed playback module comprises programmable logic controller (PLC), data buffer, digital to analog converter and driving amplifier; The input end and the CPU (central processing unit) of described programmable logic controller (PLC) are joined, and its control end joins with digital to analog converter and data buffer respectively; Described driving amplifier input end and described digital to analog converter output terminal join; Described digital to analog converter input end and described data buffer are read end and are joined; Described data buffer input end and described CPU (central processing unit) are joined.
Above-mentioned ABS system wheel speed signal generating means also comprises the state indicating member that is used for indicating operating status, links to each other with described CPU (central processing unit).
Above-mentioned ABS system wheel speed signal generating means, described wheel speed acquisition module also comprises active crystal oscillator, holds with the time of described programmable logic controller (PLC) and joins.Described wheel speed playback module also comprises active crystal oscillator, holds with the time of described programmable logic controller (PLC) and joins.
The beneficial effects of the utility model are: use device of the present utility model, can pass through once or the actual road test of limited number of time by the wheel speed collecting unit, high-speed, high precision is gathered the road information on the different road conditions in advance, the wheel speed signal of gathering is kept in the data storage cell after treatment, can repeatedly repeat playback; The wheel speed signal of playback reproduces actual traffic information by the Direct Digital Waveform synthetic technology, offers the usefulness of ABS test and test; Improve the recycling rate of waterused of road data, improved efficiency of research and development; And can avoid the danger that may occur when ABS tests in true road conditions.
[description of drawings]
Fig. 1 is the principle schematic of ABS system.
Fig. 2 is the signal waveform of wheel speed sensors output.
Fig. 3 is the structured flowchart of the utility model embodiment.
Fig. 4 is the utility model embodiment and peripherals connection diagram.
Fig. 5 is the structural representation of single wheel speed acquisition module among the embodiment.
Fig. 6 is the structural representation of single wheel speed playback module among the embodiment.
Fig. 7 is the workflow diagram of the CPU (central processing unit) of the utility model embodiment.
Fig. 8 is the workflow diagram of the programmable logic controller (PLC) of the utility model embodiment.
[embodiment]
Also in conjunction with the accompanying drawings the utility model is described in further detail below by specific embodiment.
As shown in Figure 1, when the gear ring of tire inboard passes through speed pickup, cause magnetic flux change, ideally will produce the AC sinusoidal voltage of standard; As shown in Figure 2, the amplitude of this alternating voltage and frequency are directly proportional with wheel speed.This waveform signal is connected with the ABS electronic control unit by wire harness, and the ABS electronic control unit is analyzed the size of four wheel speeds and changed, and judges whether to be about to occur precarious position, and by regulating each pressure valve, makes its corresponding measures.The utility model ABS system wheel speed signal generating means is used for gathering in advance multiple wheel speed data, exports to then and waits the ABS electronic control unit developing or test.
As shown in Figure 3, this routine ABS system wheel speed signal generating means comprises CPU (central processing unit) 2, the wheel speed collecting unit 3 that is connected with CPU (central processing unit) 2 respectively, wheel speed playback unit 4, data storage cell 5, status unit 6 and state indicating member 7; Status unit 6 comprises the button of two difference in functionalitys, is respectively to gather start button and playback start button, and CPU (central processing unit) is carried out distinct program under the control of two buttons, makes this device be in different running statuses; State indicating member 7 is two LED lamps, indicates this device to be in wheel speed acquisition state or wheel speed playback state respectively, shows current working state during work.
When gathering wheel speed signal, the wheel speed signal that wheel speed collecting unit 3 is gathered is input to CPU (central processing unit) 2, is deposited into data storage cell 5 after CPU (central processing unit) 2 is handled; During the playback wheel speed signal, CPU (central processing unit) 2 is transferred the wheel speed signal that is kept in the data storage cell 5, is input to wheel speed playback unit 4 after CPU (central processing unit) 2 is handled.
As shown in Figure 4, when gathering wheel speed signal, the input end of wheel speed collecting unit 3 links to each other with the output terminal of wheel speed sensors 8; When the playback wheel speed signal, CPU (central processing unit) 2 is by wheel speed playback unit 4 outputs four road wheel speed signals, the output signal of wheel speed playback unit 4 links to each other by the input end of special purpose interface with ABS electronic control unit 9, be ABS electronic control unit 9 inputs four road wheel speed signals, required input data when promptly providing the ABS control system to develop experiment and performance test.
Wheel speed collecting unit 3 comprises four wheel speed acquisition modules, as shown in Figure 5, each wheel speed acquisition module comprises: active crystal oscillator CLK11, programmable logic controller (PLC) CPLD10,16 first in first out data buffer FIFO12,16 analog to digital converter AD 32 and prime amplifier 33 at a high speed.Connect by two I/O pins between CPLD10 and the CPU (central processing unit) 2, i.e. CMD among Fig. 5.CPLD10 determines current mode of operation by the height of this pin level, and when being in waiting status, the level of CMD is 00; When being in the collection wheel speed, the level of CMD is 01; When being in the playback wheel speed signal, the level of CMD is 10.When gathering wheel speed signal, press the collection start button, the input end of FIFO 12 directly is connected with the data port of AD32, FIFO12 write signal end is connected with CPLD 10, afterwards draw high when obtaining a rising edge when CPLD drags down this signal earlier, FIFO will write data from the data port of AD.Because self principle of work of FIFO whenever writes data, old data will move a position from trend FIFO outlet.The end of reading of FIFO is connected with the external bus of CPU (central processing unit), and external bus comprises 16 position datawires, chip selection signal, read signal.As shown in Figure 7, CPU (central processing unit) will be judged the dummy status of FIFO circularly, when FIFO is not sky, will read data from FIFO, then the data that read be write in the SD storage card according to certain structure and order.The input clock signal frequency division that this moment, CPLD produced active crystal oscillator CLK, obtain the predominant frequency control signal of CPLD work, each negative edge at this signal, control FIFO writes a value from the AD data port, give pulse of AD converter afterwards, AD will start conversion next time, and the wheel speed signal that amplifies through prime amplifier is converted to 16 position digital signals.
Wheel speed playback unit 4 comprises four wheel speed playback module, and as shown in Figure 6, each wheel speed playback module comprises: active crystal oscillator CLK11, programmable logic controller (PLC) CPLD10,16 data fifo buffer memorys 12,16 DA converters 42, driving amplifier 43 at a high speed.When the pin status that is connected with CPU (central processing unit) as CPLD10 was 10, this device was in the wheel speed playback state.The end that writes of FIFO12 is connected with the external bus of CPU (central processing unit), and external bus comprises 16 position datawires, chip selection signal and write signal.The end data mouth of reading of FIFO12 directly is connected with the data port of DA converter 42.The end of reading of FIFO is read control signal and is connected with CPLD.When being in the wheel speed playback state, press the playback start button, CPU (central processing unit) is in certain sequence from SD card reading of data, the valid data that these data are not adjusted into when " expiring " 16 when fifo status are write among the FIFO, when the frequency of operation negative edge of CPLD behind the CLK frequency division arrived simultaneously, control FIFO read data in the DA data port, and the simulating signal of DA output terminal output is updated to new magnitude of voltage, after overdriven amplifier amplifies, output in the ABS electronic control unit.
As shown in Figure 7, it is the workflow diagram of the CPU in this example, and the working routine of CPU is stored in the internal storage, is used to control the operation of whole device, response user's operation and display working condition in pilot lamp.
As shown in Figure 8, it is the process chart of the CPLD in this example, adopts VHDL language to write the logic control sequential, according to the different working modes that CPU gives, the working time of control FIFO and AD or DA, assists to finish wheel speed collection or generation.
Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.Such as, programmable logic controller (PLC) also can adopt FPGA.
Claims (6)
1. an ABS system wheel speed signal generating means is characterized in that: comprise CPU (central processing unit), wheel speed collecting unit, wheel speed playback unit, data storage cell and status unit; Described wheel speed collecting unit, wheel speed playback unit, data storage cell and status unit are connected with described CPU (central processing unit) respectively.
2. ABS as claimed in claim 1 system wheel speed signal generating means, it is characterized in that: described wheel speed collecting unit comprises some wheel speed acquisition modules; Described wheel speed acquisition module comprises programmable logic controller (PLC), data buffer, analog to digital converter and prime amplifier; The input end and the CPU (central processing unit) of described programmable logic controller (PLC) are joined, and its control end joins with analog to digital converter and data buffer respectively; Described prime amplifier output terminal and described analog to digital converter input end join; Described analog to digital converter output terminal and described data buffer input end join; Described data buffer is read end and is joined with described CPU (central processing unit).
3. ABS as claimed in claim 1 or 2 system wheel speed signal generating means, it is characterized in that: described wheel speed playback unit comprises some wheel speed playback module; Described wheel speed playback module comprises programmable logic controller (PLC), data buffer, digital to analog converter and driving amplifier; The input end and the CPU (central processing unit) of described programmable logic controller (PLC) are joined, and its control end joins with digital to analog converter and data buffer respectively; Described driving amplifier input end and described digital to analog converter output terminal join; Described digital to analog converter input end and described data buffer are read end and are joined; Described data buffer input end and described CPU (central processing unit) are joined.
4. ABS as claimed in claim 1 or 2 system wheel speed signal generating means is characterized in that: also comprise the state indicating member that is used for indicating operating status, link to each other with described CPU (central processing unit).
5. ABS as claimed in claim 2 system wheel speed signal generating means, it is characterized in that: described wheel speed acquisition module also comprises active crystal oscillator, joins with the time end of described programmable logic controller (PLC).
6. ABS as claimed in claim 3 system wheel speed signal generating means, it is characterized in that: described wheel speed playback module also comprises active crystal oscillator, joins with the time end of described programmable logic controller (PLC).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201715702U CN201145640Y (en) | 2007-12-19 | 2007-12-19 | ABS system wheel velocity signal generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201715702U CN201145640Y (en) | 2007-12-19 | 2007-12-19 | ABS system wheel velocity signal generator |
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| CN201145640Y true CN201145640Y (en) | 2008-11-05 |
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| CNU2007201715702U Expired - Lifetime CN201145640Y (en) | 2007-12-19 | 2007-12-19 | ABS system wheel velocity signal generator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788366B (en) * | 2010-01-15 | 2012-06-20 | 北京航空航天大学 | Positive/negative pressure signal generating device |
| CN105928713A (en) * | 2016-05-16 | 2016-09-07 | 淮海工学院 | Signal reproduction system for real-car ABS four wheel speed sensor |
| CN106289802A (en) * | 2016-08-12 | 2017-01-04 | 南京理工大学 | A kind of portable vehicle wheel speed signal generating means |
| WO2024114191A1 (en) * | 2022-11-29 | 2024-06-06 | 华为技术有限公司 | Data processing method and apparatus |
-
2007
- 2007-12-19 CN CNU2007201715702U patent/CN201145640Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101788366B (en) * | 2010-01-15 | 2012-06-20 | 北京航空航天大学 | Positive/negative pressure signal generating device |
| CN105928713A (en) * | 2016-05-16 | 2016-09-07 | 淮海工学院 | Signal reproduction system for real-car ABS four wheel speed sensor |
| CN105928713B (en) * | 2016-05-16 | 2018-06-12 | 淮海工学院 | A kind of real vehicle ABS four-wheels wheel speed sensors signal reproduction system |
| CN106289802A (en) * | 2016-08-12 | 2017-01-04 | 南京理工大学 | A kind of portable vehicle wheel speed signal generating means |
| WO2024114191A1 (en) * | 2022-11-29 | 2024-06-06 | 华为技术有限公司 | Data processing method and apparatus |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081105 |