CN105973612B - A kind of online transient test system of engine control and operating parameter - Google Patents

Abstract

The present invention relates to a kind of online transient test systems of engine control and operating parameter, it includes CPU module (1), tach signal processing module (2), analog signal processing module (3), USB communication module (4), it is characterized by: CPU module (1) is used to complete the acquisition and processing of tach signal, tach signal processing module (2) provides suitable signal for handling magnetoelectric transducer tach signal and Hall sensor tach signal, to CPU module (1)；Analog signal processing module (3) is used to convert the decaying of acquisition target analog signal, filtering, isolation, amplification and acquisition；USB communication module (4) is used to transmit host computer order and is sent to host computer to slave computer and by the data that slave computer acquires.The invention solves the measurands synchro measure such as engine speed and cylinder pressure of engines, ignition signal, fuel injection signal, VVT signal, temperature, pressure.

Description

A kind of online transient test system of engine control and operating parameter

Technical field

The present invention relates to engine detection technique field, in particular to a kind of online wink of engine control and operating parameter State test macro.

Background technique

Optimization, the calibration of the performance development of engine and operating parameter, usually by performance under steady state condition or It is completed on test-bed by steady state test, but the actual operating mode of engine is largely transient condition, therefore transition Performance under operating condition determines practical dynamic property, economy and the emission level of engine；Past is due to lacking real-time detection side Method and technology, engine is mounted in the performance of the actual performance on vehicle, often unknowable；With the difference of stable state rig test result And inducement, often it can hardly be explained；Superiority and inferiority degree of rack (stable state) calibrating parameters under transient state, it is often confusing； The physical quantitys such as engine speed and cylinder pressure of engines, ignition signal, fuel injection signal, VVT signal, temperature, pressure have opposite Angle and sequential relationship；This test macro provide it is a kind of online, in real time, continue, dynamic testing method finds engine speed The opposite angle between the physical quantitys such as measured cylinder pressure of engines, ignition signal, fuel injection signal, VVT signal, temperature, pressure And sequential relationship, see whether angle between them and sequential relationship are suitable；Analog acquisition signal is from engine in test The cdm signal and TRG signal obtained in tach signal, the object of test be the cylinder pressure of engine, ignition signal, fuel injection signal, The physical quantitys such as VVT signal, temperature, pressure；The generation of cdm signal and the working sequence of collection of simulant signal are all by central processing What the clock processing module 10 of device module 1 provided simultaneously, be synchronous, so that it is synchronous with acquisition target to realize acquisition signal With one-to-one acquisition method.

Summary of the invention

Mesh of the invention be to provide one kind can be realized engine speed and cylinder pressure of engines, ignition signal, fuel injection signal, The system of the synchronous detection of VVT signal, temperature, pressure measurand.

The technical solution of the present invention is to provide a kind of online transient test system of engine control and operating parameter, packets Include CPU module, tach signal processing module, analog signal processing module, USB communication module, it is characterised in that:

CPU module is used to complete the acquisition and processing of tach signal, and the generation of cdm signal and TRG signal is high Fast AD starting, acquisition, stopping and timing control, acquisition data FIFO storage acquire the data transmission between data and USB and lead to News；

Tach signal processing module is for handling magnetoelectric transducer tach signal and Hall sensor tach signal, to center Processor module provides suitable signal；

Analog signal processing module is used to turn the decaying of acquisition target analog signal, filtering, isolation, amplification and acquisition It changes；

USB communication module is used to transmit host computer order and is sent to host computer to slave computer and by the data that slave computer acquires.

Further, CPU module include clock processing module, revolving speed processing module, cdm signal generation module, TRG signal generator module, AD command module, AD data module, data bus module, FIFO memory module, USB command module； Wherein:

Clock processing module is handled by the clock processing module and is exported for receiving external 50MHz crystal oscillation signal input The frequency signal that each submodule needs in CPU module；

Revolving speed processing module finds hypodontia, sets synchronization for capturing the tach signal that tach signal processing module is handled well Identifier calculates the period i.e. tooth rim phase of each tooth；

Cdm signal generation module is used to receive the tooth rim phase for each capture that revolving speed processing module is brought, and generates Cdm signal；

TRG signal generator module is used to receive the cdm signal of cdm signal generation module generation and the TRG of host computer setting Value is common to generate TRG signal, determines the position TRG, is used for system synchronization process and positioning；

AD command module issues control command for the AD acquisition module into analog signal processing module, and starting acquisition is simultaneously Generate acquisition data；The AD data module of CPU module is used to receive the AD data that a channel generates；

There are AD data module 16 I/O mouths initialized to receive corresponding 16 acquisition channel data；AD data mould Block reads data using the 64MHz timing that clock processing module generates；

Data bus module is the channel of FIFO memory module data reading and writing；

FIFO memory module is used to keep in the AD data that AD data module is read, and then orders in the reading of USB control module It enables and sending out the data being stored in FIFO memory module under request；

USB control module is executed for receiving host computer order and be explained to slave computer.

Further, tach signal processing module includes magnetoelectricity signal processing module, hall signal processing module, compound letter Number processing module；

Engine rotational speed signal includes magnetoelectric tachometric signal and Hall-type tach signal；Wherein: magnetoelectric tachometric signal It is handled by magnetoelectricity signal processing module, Hall-type tach signal is handled by hall signal processing module, and then the two is given compound Signal processing module processing is finally provided to the revolving speed processing module capture of CPU module.

Further, analog signal processing module includes AD attenuation module, AD protective module, AD isolation module, AD driving Module, AD acquisition module；

Analog signal is accessed from AD attenuation module, halves its signal voltage；Analog signal subsequently enters AD protective module, AD protective module, effect are subject to various unexpected signal impacts, protection signal path safety；Analog signal subsequently enters AD isolation Module, the effect of AD isolation module are to play Isolation, impedance transformation, amplification to signal and keep input voltage and output Voltage swing and phase invariant；Analog signal subsequently enters AD drive module, the effect of AD drive module be to provide differential signal to Converter；Analog signal subsequently enters AD acquisition module, and the effect of AD acquisition module is according to order request to by handling well Analog signal be AD converted, transformation result is serially passed out to the AD data module of CPU module 1.

Further, USB communication module includes USB2.0 high-speed transceiver module, intelligent SIE module, USB FIFO mould Block, in which:

USB2.0 high-speed transceiver module is used to receive host computer and gives data line biography of the order through USB communication module come To the USB control command of CPU module, then receives the acquisition data that CPU module issues and be transmitted to host computer；

Intelligent SIE module is for handling low speed USB and high speed USB switching；

USB fifo module is for temporary exchange data.

The beneficial effects of the present invention are:

1, a kind of method that this test macro has innovated timing synchronization solves engine speed and cylinder pressure of engines, point The synchronous method of the measurands such as fiery signal, fuel injection signal, VVT signal, temperature, pressure, i.e., CPU module 1 when Clock processing module 10 provides unified working sequence for each submodule, and the movement of each submodule is all according to unified working sequence It works simultaneously.

2, this test macro has innovated a kind of hypodontia judgment method, provides judgment method to find hypodontia；Hypodontia judgement Method is exactly: the current tooth rim phase is greater than 2 times of previous tooth rim and less than 4 times of the previous tooth rim phase, meets this condition just Think to have found hypodontia, if being unsatisfactory for continuing to find until finding.

3, this test macro innovated a kind of cdm signal generate method, it is a kind of do not lose CDM number, do not increase doing for CDM number yet Method, i.e. stable, reliable, the lasting method of realization cdm signal, method are exactly each tooth rim phase to generate CDM fixed number.

4, this test macro has innovated a kind of TRG signal generation method, i.e., generates TRG using synchronization identifier and CDM number Signal.

5, this test macro has innovated a kind of collecting method, i.e. the generation of acquisition signal and the processing of acquisition target is It is all by the timing control of the clock processing module 10 of CPU module 1 by same timing control；Acquire signal CDM is to obtain from engine speed, and engine speed and cylinder pressure of engines are that have opposite sequential relationship, to realize The acquisition method that acquisition signal CDM and acquisition target cylinder pressure of engines are combined into one；Control the touching that AD acquisition module 35 acquires Signalling is exactly the cdm signal and TRG signal that system oneself generates, and the cdm signal that system generates is synchronous from engine speed It obtains, therefore cdm signal is synchronous with engine speed；The cylinder pressure of engine, ignition signal, fuel injection signal, VVT signal, Processing of the measurands such as temperature, pressure Jing Guo analog signal processing module 3 is sent to AD acquisition module 35, in cdm signal Conversion of the analog signal to digital signal is completed under trigger collection；And revolving speed processing module 11, cdm signal generation module 12, AD The working sequence of acquisition module 35 be all by CPU module 1 clock processing module 10 and meanwhile provide, be it is synchronous, To realize the acquisition synchronous with acquisition target and one-to-one of acquisition signal；Cylinder pressure of engines is engine fuel burning What moment generated, pace of change is fast, it is desirable that acquisition in real time, the cdm signal (electronics footmark) that this test uses same system to control Cylinder pressure is acquired with acquisition, enhances real-time, the reliability, accuracy of cylinder pressure acquisition, realizes the two fusion；

6, this test macro has innovated a kind of design of data space, exactly depositing using CPU module 1 Store up the independent memory space of spatial design, i.e. FIFO memory space 17；This method is exactly to deposit the system in CPU module 1 The a part in storage space is independently divided into 8 equal spaces, and each space size is 512 bytes, and each size is 512 byte of null Between be named as " page ", 8 " page " all the numbers of being numbered with convenient for retrieval；The size of data that memory space " page " is stored in every time is 2N, and N is The numerical value of natural number, N is influenced by acquisition channel, and when the data of " page " reach 512 bytes, i.e. one page is full, so that it may to USB Communication module 3 transmits data；All be FIFO mode because 2 all include the data space of 8 512 bytes, realization without Seam exchange data.

7, this test macro has innovated a kind of analog signal isolating method, this method to analog signal not only acted as every The effects of from, filtering, impedance transformation, amplification, and input voltage and output voltage size and phase invariant are kept, keep letter Number changing rule, separated impact of the great change of signal to circuit below.

8, a kind of method that this test macro has innovated engine acquisition real-time data transmission, while ensure that and be adopted in maximum It real-time data transmission and is not lost in the case of collection；It is exactly in the way of bulk transfer, different endpoints can be used in data transmission EP2,4,6,8, and endpoint can be configured to double buffering, triple buffer, quadruple buffering, and it is empty to share 8 512 byte FIFO bufferings Between can be recycled, fully meet that data that CPU module 1 is sent in real time are temporary and transmission.

9, this test macro provides 16 tunnel high speed acquisition channels, can acquire 16 tunnel high speed dynamic pickup data simultaneously, The variation of the various operating conditions of engine can be captured, in real time, accurately convenient for being quickly found out engine each object under various operating conditions Correlation between reason amount and its whether it is compatible with, is tested convenient for on-board engine；High-speed channel can be (dynamic for cylinder pressure sensor State), air inlet pressure sensor (dynamic), back pressure transducer (dynamic), ignition signal, fuel injection signal, VVT signal etc..

10, this test macro has been innovated the method for data transfer mode and the combination of accurate electronics footmark；This system uses Data are transmitted between high speed USB 2.0 (USB3.0 etc. can be upgraded in the future) and host computer, the highest of high speed USB 2.0 transmits speed It spends up to 480Mbps, the maximum amount of data that 16 tunnels acquire data is 183.32Mbps, to solve the real-time of data transmission Property, the tool of sustainable, dynamic, real-time testing parameters is provided for on-board engine test, has filled up on-board engine Test is difficult to lasting, real-time testing blank for a long time.

Detailed description of the invention

The online transient test system block diagram of Fig. 1 engine control and operating parameter of the present invention；

Fig. 2 central processing unit mould schematic diagram of the present invention；

Fig. 3 tach signal processing module schematic diagram of the present invention；

Fig. 4 analog signal processing module diagram of the present invention；

Fig. 5 USB communication module schematic diagram of the present invention；

Wherein: 1- CPU module, 10- clock processing module, 11- revolving speed processing module, 12-CDM signal generate Module, 13-TRG signal generator module, 14-AD command module, 15-AD data module, 16- data bus module, 17-FIFO are deposited Store up module, 18-USB control module；2- tach signal processing module, 21- magnetoelectricity signal processing module, the processing of 22- hall signal Module, 23- composite signal processing module, 3- analog signal processing module, 31-AD attenuation module, 32-AD protective module, 33-AD Isolation module, 34-AD drive module, 35-AD acquisition module, 4-USB communication module 4,41-USB2.0 high-speed transceiver module, 42- intelligence SIE module, 43-USB fifo module.

Specific embodiment

Technical solution of the present invention is described in detail below with reference to attached drawing 1-5.

As shown in Figure 1, the online transient test system of engine control and operating parameter, includes mainly 4 parts, is respectively CPU module 1, tach signal processing module 2, analog signal processing module 3, USB communication module 4.

CPU module 1

Commander, coordination, the acquisition and processing of tach signal, cdm signal and TRG of the CPU module 1 for complete machine The generation of signal (electronics footmark), high-speed AD starting, acquisition, stopping and timing control, acquisition data FIFO storage acquire data The functions such as data transmission and communication between USB.

The block diagram of CPU module 1 is respectively as follows: clock processing module 10, at revolving speed as shown in Fig. 2, point 9 parts Module 11, cdm signal generation module 12, TRG signal generator module 13, AD command module 14, AD data module 15 are managed, data are total Wire module 16, FIFO memory module 17, USB command module 18.

For CPU module 1 using the FPGA of Altera, model is EP4CE22E22I7N, the logic of the FPGA Unit up to 22320, various required digital circuits can be flexibly formed, realize this system required function；Memory is up to 594Kbits can form the memory of diversified forms and function to store AD conversion result, various interlocutory orders etc.；18x18 Multiplier has 66, provides hardware computation platform to various algorithms, substantially increases the speed and ability of processing data；I/O Mouth has 8 pieces of maximums that can use 76, these hardware modules provide the platform of processing signal and data in real time.

The clock processing module 10 of CPU module 1 receives external 50MHz crystal oscillation signal input, at the module The frequency signal that each submodule needs in reason output CPU module 1；Each submodule includes revolving speed processing module 11, CDM letter Number generation module 12, TRG signal generator module 13, AD command module 14, AD data module 15, data bus module 16, FIFO Memory module 17, USB command module 18 etc.；The movement of all software modules of central processing unit is all in CPU module It works simultaneously under the unified command of 1 clock processing module 10, to play the role of coordinating and acting in agreement；Start The physical quantitys such as machine revolving speed and cylinder pressure of engines, ignition signal, fuel injection signal, VVT signal, temperature, pressure have opposite angle And sequential relationship；Find engine speed and cylinder pressure of engines, ignition signal, fuel injection signal, VVT signal, temperature, pressure etc. The relationship of measurand, it is necessary to there is unified timing, and the clock processing module 10 of CPU module 1 provides respectively The timing of submodule work, and the movement of each submodule all carries out simultaneously, thus there is unified timing；This is just innovated A kind of method of timing synchronization, solve engine speed and cylinder pressure of engines, ignition signal, fuel injection signal, VVT signal, The synchronous method of the measurands such as temperature, pressure.

The revolving speed processing module 11 of CPU module 1 is mainly used for capturing what tach signal processing module 2 was handled well Tach signal finds hypodontia, sets synchronization identifier, calculates the period i.e. tooth rim phase of each tooth；It can be selected when finding hypodontia Rising edge or failing edge capture are selected, can not also be selected using default behavior --- rising edge capture；On revolving speed processing module 11 receives The tach signal of position machine tooth type 60-2,36-1, the 30-1 assigned and capture, carry out hypodontia judgement, find hypodontia, that is, realize The synchronization of tach signal, sets synchronization identifier, as the starting point of cdm signal and the reference point of TRG signal；Then tooth rim is carried out The calculating of phase is supplied to the tooth rim phase of each capture of the clock calculation of revolving speed processing module 11 using clock processing module 10, It is supplied to cdm signal generation module 12 and the other modules of system uses；There is the tooth rim phase to can be carried out hypodontia judgement, this system A kind of hypodontia judgment method is innovated, i.e., the current tooth rim phase is greater than 2 times of previous tooth rim and is less than the 4 of the previous tooth rim phase Times, meet this condition and be considered as having found hypodontia, if being unsatisfactory for continuing to find until finding.

The cdm signal generation module 12 of CPU module 1 be exactly receive revolving speed processing module 11 bring it is each The tooth rim phase of a capture, generate it is reliable, stablize, do not lose and also do not increase cdm signal；1 degree of acquisition step-length being assigned according to host computer, 0.5 degree, 0.25 degree, 0.2 degree, 0.1 degree and tooth type 60-2,36-1,30-1 determine the CDM number of each tooth rim phase, generate Cdm signal；In order to which accurate and measurement is reliable, the cdm signal of this system is independently generated by each tooth periodic signal, starting point It is exactly the synchronization identifier set in revolving speed processing module 11, the cdm signal number that each tooth rim phase generates is identical；As above The acquisition step-length of position machine selection is 0.5 degree, and for the tooth of 60-2, that is, each tooth generates 12 cdm signals, a circle 360 degree, CDM number of 60 teeth, generation is exactly 720；If the acquisition step-length of upper computer selecting is 0.1 degree, for 60-2's For tooth, that is, each tooth generates 60 cdm signals, and 360 degree of a circle, CDM number of 60 teeth, generation is exactly 3600； Rotation speed change causes tooth mechanical periodicity, and 3 kinds of situations of state point of tooth rim phase, the first is that at the uniform velocity, the tooth rim phase is fixed, each tooth rim Phase generates CDM fixed number, and second situation is to accelerate, tooth cycle time, can surpass after CDM fixed number of tooth rim phase output A part of tooth cycle time out, need to subtract when at this moment next tooth rim phase generates CDM tooth rim phase beyond part, so Export CDM fixed number again afterwards, to guarantee that each tooth rim phase generates CDM fixed number, CDM number, third are not lost in realization Kind situation is to slow down, tooth cycle stretch-out, meeting residue a part of tooth cycle time after CDM fixed number of tooth rim phase output, still Next tooth rim phase generates the tooth rim phase of cdm signal Shi Congxin, previous residual tooth cycle time is omitted, to guarantee Each tooth rim phase generates CDM fixed number, and realization does not increase CDM number；As long as engine is fixed, its tooth type is fixed, because No matter revolving speed is fast or unrestrained for this, accelerates or slows down, and CDM number is exactly a definite value under selected acquisition step-length, to realize The stability and reliability of CDM, thus innovated a kind of cdm signal generate method, it is a kind of do not lose CDM number, also do not increase CDM Several methods；Cdm signal is the trigger signal of analog signal processing module 3, each cdm signal triggers an analog signal Acquisition, since trigger signal CDM is reliable, stablize, do not lose, the acquisition of analog signal be also it is reliable, stable, do not lose, To realize the new method that is reliable, stablizing and do not lose acquisition data of collection of simulant signal；

According to the TRG numerical value that host computer is selected, using the synchronization identifier of the generation of revolving speed processing module 11 as reference point, according to CDM number determines the position TRG, i.e., TRG signal is generated since that cdm signal；Such as acquiring step-length is 0.1, what host computer was selected TRG number is 23.5, then TRG signal is exactly to generate in the 235th cdm signal, each circle only generates a TRG signal；It produces Given birth to cdm signal and TRG signal is exactly realize Electron Angular target generation, so that it may being supplied to analog signal processing module 3 makes With just having the trigger signal being acquired to analog signal, due to being that internal system generates, while being supplied to internal system It uses, is not influenced by external environment etc., enhance real-time, the reliability and stability of collection of simulant signal, especially pair The acquisition of the fast signal of the variations such as cylinder pressure, ignition signal, fuel injection signal provides real-time and accurate guarantee, thus innovates A kind of TRG generation method, i.e., generate TRG signal using synchronization identifier and CDM number.

The AD command module 14 of CPU module 1 is for the AD acquisition module 35 into analog signal processing module 3 Control command is issued, starting acquires and generates acquisition data；The control command that AD command module 14 issues includes AD acquisition module The order such as 35 configuration, piece choosing, start and stop, clock, mode；Include by the function that AD command module 14 configures AD acquisition module 35 The adjustment of reference voltage, the selection of operating mode, and the acquisition in external 16 channels can be controlled simultaneously, transformation result is serially sent To the AD data module 15 of CPU module 1, acquisition is completed；Controlling the trigger signal that AD acquisition module 35 acquires is exactly to be It unites the cdm signal and TRG signal of oneself generation, the cdm signal that system generates is obtained from engine speed is synchronous, therefore CDM Signal is synchronous with engine speed；The quilts such as the cylinder pressure of engine, ignition signal, fuel injection signal, VVT signal, temperature, pressure It surveys processing of the physical quantity Jing Guo analog signal processing module 3 and is sent to AD acquisition module 35, completed under the trigger collection of cdm signal Conversion of the analog signal to digital signal；And the work of revolving speed processing module 11, cdm signal generation module 12, AD acquisition module 35 Making timing all is the clock processing module 10 by CPU module 1 while providing, and is synchronous, to realize acquisition Signal acquisition synchronous with acquisition target and one-to-one, that is, complete real-time acquisition, be also achieved that CDM (electronics footmark) The method that the generation of signal and the acquisition of cylinder pressure of engines are combined into one；Cylinder pressure of engines is that engine fuel instancy of combustion generates , pace of change is fast, it is desirable that acquisition in real time, the cdm signal (electronics footmark) and acquire life that this test is controlled using same system It enables and enhances real-time, the reliability, accuracy of cylinder pressure acquisition to acquire cylinder pressure, realize the two fusion；To innovate one kind New collecting method, i.e. the generation CDM of acquisition signal and the processing cylinder pressure of engines of acquisition target are all by same system The timing control of the clock processing module 10 of CPU module 1, cdm signal is to obtain from engine speed, and send out Motivation revolving speed and cylinder pressure of engines are that have intrinsic sequential relationship, to be achieved that acquisition signal CDM and acquisition target start The acquisition method that machine cylinder pressure is combined into one enhances real-time, the reliability, accuracy of cylinder pressure acquisition, realizes the two fusion.

The AD data module 15 of CPU module 1 is used to receive the AD data of 16 channels generation；AD data module 15 have 16 I/O initialized mouths to receive corresponding 16 acquisition channel data；AD conversion chip ADS7854 maximum acquisition speed Rate is 1MHz, and the data output mode of use is the bis--SDO modes of 32CLK, and AD data module 15 is raw using clock processing module 10 At 64MHz timing read data；AD data module 15 will not only read external 16 tunnels acquisition data, but also collected 16 circuit-switched datas are write in the FIFO memory module 17 of internal system by data bus module 16, and will be according to every page of 512 words Section carries out, because FIFO memory module 17 and external USB communication module 4 are to carry out data exchange by 512 bytes.

The data bus module 16 of CPU module 1 is the channel of 17 data reading and writing of FIFO memory module；In order to mention High reading and writing speed, system design bus width are 32；One side AD data module 15 passes through data bus module 16 to FIFO Data are written in memory module 17, another aspect system needs to pass through number in the data read command for being connected to USB control module 18 It is transmitted outward according to bus module 16 from being sent to request data in FIFO memory module 17 on external data/address bus.

The FIFO memory module 17 of CPU module 1 is a kind of self-designed storage of data first in first out of system Then space will deposit for keeping in the AD data that AD data module 15 is read under the read command request of USB control module 18 The data stored up in FIFO memory module 17 are sent out；Because it is according to 512 words that USB communication module 3, which exchanges data with the external world, It is 8*512 byte that section carries out and its mode, which is FIFO, total space, then just needing newly to set in CPU module 1 Identical data space is counted to meet the requirement of USB communication module 3, can be only achieved the transmission speed of high speed USB 2.0, Just it is able to satisfy the requirement of system real-time Transmission；FIFO memory module 17 be system according to USB data transmission format in central processing A kind of newly-designed memory space of memory space of system is utilized in device module 1, which is by system memory space A part is independently divided into 8 equal spaces, and each space size is 512 bytes, is named as to it " page ", 8 pages are all numbered Convenient for retrieval, the purpose done so is exactly to open up the data spaces of 8 512 bytes to come and the USB FIFO in USB communication module 3 Module 43 exchanges data, thereby realizes the data of 512 bytes of primary exchange；The AD data that AD data module 15 is read are Intermittent, the size of data read every time is 2N, and N is natural number, and the numerical value of N is influenced by acquisition channel, when FIFO is stored Data in module 17 reach 512 bytes, i.e. one page is full, so that it may transmit data to USB communication module 3；Because 2 all wrap Data space containing 8 512 bytes is all FIFO mode, realization seamless exchange data；To in CPU module 1 A kind of middle design method for having innovated memory space, i.e. FIFO memory space 17, this method is exactly will be in CPU module 1 A part of system memory space independently be divided into 8 equal spaces, each space size is 512 bytes, is named as to it " page ", to 8 page numbers of being numbered with convenient for retrieval；The size of data that memory space " page " is stored in every time is 2N, and N is natural number, N's Numerical value is influenced by acquisition channel, and when the data of " page " reach 512 bytes, i.e. one page is full, so that it may to USB communication module 3 Transmit data；It is all FIFO mode, realization seamless exchange number because 2 all include the data space of 8 512 bytes According to；

The USB control module 18 of CPU module 1 is for receiving host computer order and being explained to slave computer It executes, plays an information exchange.

Tach signal processing module 2

As shown in figure 3, tach signal processing module 2 divides 3 parts, respectively magnetoelectricity signal processing module 21, hall signal Processing module 22, composite signal processing module 23；Tach signal processing module 2 is for handling magnetoelectric transducer tach signal and suddenly That sensor rotation speed signal, provides suitable signal to CPU module 1.

Engine rotational speed signal usually has 2 kinds, magnetoelectric tachometric signal and Hall-type tach signal；Magnetoelectric tachometric signal It is handled by magnetoelectricity signal processing module 21, Hall-type tach signal is handled by hall signal processing module 22, and then the two is given The processing of composite signal processing module 23, the revolving speed processing module 11 for being finally provided to CPU module 1 capture；Magneto-electric turns Fast signal is just profound wave, and amplitude increases with the increase of revolving speed, and magnetoelectricity signal processing module 21 is mainly by MAX9924UAUB group At the chip feature is that threshold values is automatically adjustable, the magnetic-electric sensing which is just suitble to processing amplitude to increase with revolving speed increase Device signal, to effectively make its just profound signal squared, so that it may be sent into the processing of composite signal processing module 23；Hall-type revolving speed Signal is square wave, handles same composite signal processing module 23 of being sent by hall signal processing module 22 and handles；Composite signal The main built-up circuit of processing module 23 is SN74LVC2G17, which is double schmidt trigger buffers, and major function is solution Certainly level is compatible and is filtered to signal, while signal being made to be conducive to CPU module 1 closer to ideal square wave The processing of revolving speed processing module 11, it is more real-time, accurately capture tach signal.

Analog signal processing module 3

As shown in figure 4, analog signal processing module 3 includes AD attenuation module 31, AD protective module 32, AD isolation module 33, AD drive modules 34, AD acquisition module 35；Analog signal processing module 3 is used for decaying, filter to acquisition target analog signal Wave, isolation, amplification and acquisition conversion etc..

Analog signal is accessed from AD attenuation module 31, halves its signal voltage, it is therefore an objective to measuring range be made to double to reach +/- 10V meets design requirement.

Analog signal subsequently enters AD protective module 32, and module effect is subject to various unexpected signal impacts, protection letter Number channel security；Protective module is executed using the two-way two-way ESD protection diode of PESD5V0S2BT, the two-way two-way ESD bis- Up to 130 watts, the maximum surge current that can be born is able to bear various the peak-pulse power that pole pipe can be born up to 12 peaces times Unexpected signal impact.

Analog signal subsequently enters AD isolation module 33, the module effect be to signal rise Isolation, impedance transformation, The effects of amplification and holding input voltage and output voltage size and phase invariant；The module, which mainly forms, is transported by ADA4807 Composition voltage follower is put, Isolation effect has been not only acted as, and makes input voltage and output voltage size and phase one Sample, moreover it is possible to realize impedance transformation, the input impedance of voltage follower is very big, reduces the pressure of signal source, more true to protect Signal prototype is held；ADA4807 is rail-to-rail input/output amplifier, and-three dB bandwidth is up to 180MHz；It is with low function Consumption, the source current of single amplifier only have 1.0mA；With extremely low input offset voltage and drift, maximum value is respectively +/- 125uV and 3.7uV/ DEG C, while having extremely low input offset current and drift, maximum value are respectively 100nA and 250pA/ DEG C, These characteristics not only ensure that the authenticity of signal transmission, but also play Isolation, impedance transformation, amplification etc. to signal Effect；Cylinder pressure signal, ignition signal, fuel injection signal etc. of engine are used as measured signal, feature be exactly signal amplitude and Bandwidth changes greatly, and bandwidth is wider, and signal is easily by noise jamming；Measuring system needs to have that input impedance is big, input imbalance electricity Pressing and drift about, small, input offset current and drift are low, can just handle signal well with wide；And the voltage of ADA4807 amplifier composition Follower just has These characteristics as isolation circuit, has thus innovated a kind of measurement cylinder pressure of engines, ignition signal, oil spout The amplitudes such as signal are big, with wide isolation circuit method, and one has kept the changing rule of signal, secondly having separated signal intensity Impact to circuit below.

Analog signal subsequently enters AD drive module 34, and module effect is to provide differential signal to converter, guarantees Signal is true, balances；It is ADA4940 that the module, which mainly forms, it is the fully differential of a kind of low distortion, low noise, super low-power consumption ADC driver；Purpose using ADC differential driver is that can provide differential signal to converter, guarantee signal it is true, Balance；For ADA4940 signal bandwidth up to 260MHz, harmonic distortion is -96dB THD at 1MHz；Utilize 4 electricity of exterior arrangement The feedback network of resistance composition is achieved that differential gain circuit, feedback network determine the closed loop gain of amplifier, facilitates adjusting.

Analog signal subsequently enters AD acquisition module 35, and module effect is according to order request to the mould by handling well Quasi- signal is AD converted, and transformation result is serially passed out to the AD data module 15 of CPU module 1；The module is main Composition is ADS7854, which includes 2 groups of independent AD conversion, samples analog-digital converter for 14 bit synchronizations, internal includes two A reference voltage source being independently programmable can be used for system-level gain calibration, and equipped with fortune in a wide power supply district Capable flexible serial line interface, to easily realize the communication with a variety of host controllers；The reference voltage source that the design selectes is 2.5V, what data output serial line interface was selected is the bis--SDO modes of 32CLK；AD acquisition module 35 receives CPU module 1 AD command module 14 the analog signal control command, including piece choosing, start and stop, clock, mode etc. that issue order, wanted according to order It asks and is AD converted to by the analog signal handled well, transformation result is serially passed out to the AD number of CPU module 1 According to module 15.

USB communication module 4

As shown in figure 5, USB communication module includes USB2.0 high-speed transceiver module 41, intelligent SIE module 42, USB Fifo module 43.

USB communication module main task is to transmit host computer order to be sent to slave computer and by the data that slave computer acquires Position machine.

The function of USB2.0 high-speed transceiver module 41 is to receive host computer to give the order come through USB communication module 4 Data line is transmitted to the USB control command 18 of CPU module 1, then receives the acquisition number that CPU module 1 issues According to being transmitted to host computer；USB communication module uses the CY7C68013A special module of CYPRESS company, is set as high in use Speed transmission, reaches as high as 480Mbps, using bulk transfer mode, be exactly USB communication module exchanged with host computer data be according to What every page of 512 bytes carried out, it is also to carry out according to 512 bytes that USB communication module 4, which exchanges data with CPU module 1,； In bulk transfer mode, the endpoint that can be used of data transmission is that wherein EP4,8 are double bufferings for EP2,4,6,8, EP2,6 can be with Double buffering, triple buffer, quadruple is configured to buffer；USB fifo module 43 in USB communication module 4 is 4K, Ke Yipei At 8 512 byte spaces, it is used to configure as desired to endpoint, main purpose is that storage CPU module 1 is sent out The AD acquisition data come up, because AD acquisition is according to acquisition step-length and acquisition channel difference, the acquisition data variation of generation is larger, Such as in the case where revolving speed is 1000RPM, acquisition step-length is 1 degree, and port number is under 1 channel, and data only have 96Kbps, are such as in revolving speed Under 6000RPM, acquisition step-length is 0.1 degree, and port number is under 16 channels, and data are up to 184.32Mbps；In order to guarantee in real time and Data are not lost, transmits it is necessary to use the multiple configuration of USB fifo module 43 in USB communication module, data is made to have the sky of buffering Between, to ensure that the reliability of real-time Transmission, stability；Engine operate when rotation speed change usually from 1000RPM to 6000RPM variation, it is also different to the step-length of different amount acquisitions, usually change at 1 degree to 0.1 degree, has to the object of acquisition more Have less, usually in 1 channel to 16 channel selectings, the variation of acquisition data volume is from 96Kbps to 184.32Mbps in this way, in difference The data rate that the buffering of endpoint configures lower USB and can transmit is 480Mbps, more than the speed that CPU module 1 generates data Rate is big；USB fifo module 43 in USB communication module 4 is 4K, can be made into 8 512 byte spaces, is exactly for end Point configures as desired, to meet the transmission of different rates；A kind of engine acquisition real-time data transmission is thus innovated Method, while ensure that real-time data transmission and the method do not lost in maximum acquisition, be exactly in the way of bulk transfer, Data transmission can be used different endpoint EP2,4,6,8, and to can be configured to double buffering, triple buffer, quadruple slow for endpoint Punching, sharing 8 512 byte FIFO cushion spaces can be recycled, and fully meet the number that CPU module 1 is sent in real time According to temporary and transmission.

Intelligent SIE module 42 mainly handles low speed USB and high speed USB switching, and low speed transmissions energy consumption is less than high-speed transfer, Therefore system use can use intelligent SIE module 42 in low speed and set low speed USB use for system.

43 major function of USB fifo module is temporary exchange data, and it is first in first out mechanism that data, which pass in and out mechanism, there is 4K Size can be made into 8 512 byte spaces, be allocated to different endpoints according to design requirement and use.

This test macro can provide 16 tunnel high speed acquisition channels, can acquire 16 tunnel high speed dynamic pickup data simultaneously, The variation of the various operating conditions of engine can be captured, in real time, accurately convenient for being quickly found out engine each object under various operating conditions Correlation between reason amount and its whether it is compatible with, is tested convenient for on-board engine；High-speed channel can be (dynamic for cylinder pressure sensor State), air inlet pressure sensor (dynamic), back pressure transducer (dynamic), ignition signal, fuel injection signal, VVT signal etc.；This A little processing being measured through analog signal processing module 3 acquire mould in AD simultaneously under the unified command of AD command module 14 It is AD converted in block 35, processing of the change data through AD data module 15, stores by data bus module 16 to FIFO and deposit It stores up in module 17.

Acquisition signal is cdm signal and TRG signal used in AD command module 14, they are that the speed control channel of system connects Enter what engine speed was generated through revolving speed processing module 11, cdm signal generation module 12 and TRG signal generator module 13；CDM letter It number is the trigger signal of analog signal processing module 3, each cdm signal triggers the acquisition of an analog signal, due to triggering Signal CDM is reliable, stablizes, does not lose and also do not increase, thus the acquisition of analog signal be also it is reliable, stable, to realize simulation The new method that is reliable, stablizing and do not lose acquisition data of signal acquisition；Controlling the trigger signal that AD acquisition module 35 acquires is exactly The cdm signal and TRG signal that system oneself generates, the cdm signal that system generates are acquisitions synchronous from engine speed, therefore Cdm signal is synchronous with engine speed；Cylinder pressure, ignition signal, fuel injection signal, VVT signal, the temperature, pressure of engine Processing of the equal measurands Jing Guo analog signal processing module 3 is sent to AD acquisition module 35, under the trigger collection of cdm signal Complete conversion of the analog signal to digital signal；And revolving speed processing module 11, cdm signal generation module 12, AD acquisition module 35 Working sequence be all by CPU module 1 clock processing module 10 and meanwhile provide, be synchronous, to realize Signal acquisition synchronous with acquisition target and one-to-one is acquired, that is, completes real-time acquisition, is also achieved that CDM (electronics Footmark) method that is combined into one of the generation of signal and the acquisition of cylinder pressure of engines；Cylinder pressure of engines is engine fuel burning wink Between generate, pace of change is fast, it is desirable that acquisition in real time, this test using same system control cdm signal (electronics footmark) and Acquisition acquires cylinder pressure, enhances real-time, the reliability, accuracy of cylinder pressure acquisition, both realizes fusion；To create A kind of new new collecting method, the i.e. generation of acquisition signal and the processing of acquisition target are all by CPU module 1 Clock processing module 10 timing control, that is, the generation of cdm signal and the processing of cylinder pressure of engines be all at clock Manage the timing control of module 10；Cdm signal is to obtain from engine speed, and engine speed is to have with cylinder pressure of engines Relative timing relationship, so that it is achieved that the acquisition method that acquisition signal CDM and acquisition target cylinder pressure of engines are combined into one, Real-time, the reliability, accuracy of cylinder pressure acquisition are enhanced, the two fusion is realized；

This test macro has been innovated new data transfer mode and the combination of accurate electronics footmark, and this system is using high speed Data are transmitted between USB2.0 (USB3.0 etc. can be upgraded in the future) and host computer, the highest transmission speed of high speed USB 2.0 can Up to 480Mbps, the maximum amount of data that 16 tunnels acquire data is 184.32Mbps, to solve the real-time that data are transmitted, is On-board engine test provides the tool of sustainable, dynamic, real-time testing parameters, has filled up on-board engine test length Phase is difficult to lasting, real-time testing blank.

Claims (1)

1. a kind of online transient test system of engine control and operating parameter comprising CPU module (1), revolving speed Signal processing module (2), analog signal processing module (3), USB communication module (4), it is characterised in that:

CPU module (1) is used to complete the acquisition and processing of tach signal, the generation of cdm signal and TRG signal, high speed AD starting, acquisition, stopping and timing control, acquisition data FIFO storage acquire the data transmission between data and USB and lead to News；

Tach signal processing module (2) is for handling magnetoelectric transducer tach signal and Hall sensor tach signal, to center Processor module (1) provides suitable signal；

Analog signal processing module (3) is used to convert the decaying of acquisition target analog signal, filtering, isolation, amplification and acquisition；

USB communication module (4) is used to transmit host computer order and is sent to host computer to slave computer and by the data that slave computer acquires；

CPU module (1) includes clock processing module (10), revolving speed processing module (11), cdm signal generation module (12), TRG signal generator module (13), AD command module (14), AD data module (15), data bus module (16), FIFO Memory module (17), USB command module (18)；Wherein:

Clock processing module (10) is handled for receiving external 50MHz crystal oscillation signal input by the clock processing module (10) Export the frequency signal that each submodule needs in CPU module (1)；

Revolving speed processing module (11) finds hypodontia, sets together for capturing the tach signal that tach signal processing module (2) is handled well Identifier is walked, calculates the period of each tooth, i.e. the tooth rim phase；

Cdm signal generation module (12) is used to receive the tooth rim phase for each capture that revolving speed processing module (11) is brought, and Generate cdm signal；

Cdm signal and host computer of the TRG signal generator module (13) for receiving cdm signal generation module (12) generation are set TRG value generates TRG signal jointly, determines the position TRG, is used for system synchronization process and positioning；

AD command module (14) issues control command for the AD acquisition module (35) in analog signal processing module (3), opens It is dynamic to acquire and generate acquisition data；The AD data module (15) of CPU module (1) is used to receive what 16 channels generated AD data；

There are AD data module (15) 16 I/O mouths initialized to receive corresponding 16 acquisition channel data；AD data mould Block (15) reads data using the 64MHz timing that clock processing module (10) generate；

Data bus module (16) is the channel of FIFO memory module (17) data reading and writing；

FIFO memory module (17) is used to keep in the AD data that AD data module (15) is read, then in USB control module (18) the lower data that will be stored in FIFO memory module (17) of read command request are sent out；

USB control module (18) is executed for receiving host computer order and being explained to slave computer；

Tach signal processing module (2) includes magnetoelectricity signal processing module (21), hall signal processing module (22), composite signal Processing module (23)；

Engine rotational speed signal includes magnetoelectric tachometric signal and Hall-type tach signal；Wherein: magnetoelectric tachometric signal is by magnetic Electronic signal processing module (21) processing, Hall-type tach signal are handled by hall signal processing module (22), and then the two is given Composite signal processing module (23) processing is finally provided to revolving speed processing module (11) capture of CPU module (1)

Analog signal processing module (3) includes AD attenuation module (31), AD protective module (32), AD isolation module (33), AD drive Dynamic model block (34), AD acquisition module (35)；

Analog signal is accessed from AD attenuation module (31), halves its signal voltage；Analog signal subsequently enters AD protective module (32), AD protective module (32), effect are subject to various unexpected signal impacts, protection signal path safety；Analog signal is then Into AD isolation module (33), AD isolation module (33) effect be to signal rise Isolation, impedance transformation, amplification and Keep input voltage and output voltage size and phase invariant；Analog signal subsequently enters AD drive module (34), and AD drives mould Block (34) effect is to provide differential signal to converter；Analog signal subsequently enters AD acquisition module (35), AD acquisition module (35) effect is to be AD converted according to order request to by the analog signal handled well, and transformation result is serially passed out to The AD data module (15) of central processor module (1)；

USB communication module (4) includes USB2.0 high-speed transceiver module (41), intelligent SIE module (42), USB fifo module (43), in which:

USB2.0 high-speed transceiver module (41) is used to receive host computer and gives data of the order through USB communication module (4) come Line is transmitted to the USB control command of CPU module (1), then receives the acquisition data that CPU module (1) issues It is transmitted to host computer；

Intelligent SIE module (42) is for handling low speed USB and high speed USB switching；

USB fifo module (43) is for temporary exchange data.