CN102063121A - Automobile body control system - Google Patents
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- CN102063121A CN102063121A CN 201010601671 CN201010601671A CN102063121A CN 102063121 A CN102063121 A CN 102063121A CN 201010601671 CN201010601671 CN 201010601671 CN 201010601671 A CN201010601671 A CN 201010601671A CN 102063121 A CN102063121 A CN 102063121A
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Abstract
The invention discloses an automobile body control system, comprising an input unit, a micro control unit and a claudication type control unit, wherein the input unit is used for receiving an input signal and transmitting the input signal to the micro control unit, the micro control unit is used for controlling a relay output control unit to drive a load to operate according to the input signal; and the claudication type control unit is used for controlling the relay output control unit to drive partial load to operate when the micro control unit is in failure. The automobile body control system provided by the invention is additionally provided with the claudication type control unit, and the relay output control unit is controlled to drive partial load to operate continuously when the micro control unit is in failure, thus ensuring normal use of the automobile body control system in a vehicle operating process and improving the stability of the automobile body control system.
Description
Technical field
The present invention relates to Auto Electronic Controlled System, relate in particular to a kind of stable higher body control system that can the retaining part load works on when micro-control unit breaks down.
Background technology
Along with science and technology development, the application of electronic technology on automobile is more and more, and the level of application of electronic technology has become the important symbol that promotes the automotive engineering level.With regard to present case, automotive electronic technology is divided into two big classes: Auto Electronic Controlled System, as ABS, electronic fuel injection etc.; Vehicular automotive electronic device is as in-vehicle multi-media system, Vehicular communication system etc.
Because the development of electronic information technology, and the maturation of embedded system, local area network (LAN) CAN and data bus technology in recent years, the integrated inexorable trend that becomes the automotive engineering development of Auto Electronic Controlled System.Wherein, body control system forms two kinds of main patterns through development: the dcs of multimode or the central control system of single module.
Wherein, distributed body control system can comprise: central control module, back car body control module, gate module and antitheft control module or the like, carry out communication by the CAN/LIN network between the module, distributed control can significantly improve the stability of body control system, avoided because the single module fault causes whole body control system to lose efficacy, and carry out the real-time that communication has guaranteed the signal transmission by the CAN/LIN network between the multimode, its inferior position is the cost height.
Central authorities control body control system and adopt single module control, and this module is finished and gathered whole input signals, drives whole loads, communication information between the CAN/LIN and diagnostic data are carried out whole control function such as analyzing and processing.Central authorities' control body control system is made of micro-control unit, input block and at least one relay output control unit usually, and micro-control unit drives loaded work piece according to the input signal pilot relay output control unit of input block.Though this control system cost is lower, the system failure that present employed central authorities control body control system ubiquity is caused by interference on the hardware and the defective on the software.For example, when micro-control unit breaks down, the relay output control unit can't continue to drive loaded work piece.Again such as, when the relay output control unit broke down, micro-control unit can not in time obtain feedback, thereby reduced the stability of body control system.In addition, along with the application of various control programs in body control system, the body control system stability problem that is caused by the program exception operation also becomes increasingly conspicuous.
And, use a large amount of motors on the vehicle at present, in the process of machine operation, exist comparatively strong electromagnetic interference (EMI); Electronic module also can produce electromagnetic interference (EMI) in the process of using; Vehicle will be subjected to extraneous electromagnetic interference (EMI) under different operating modes simultaneously, these electromagnetic interference (EMI) can be by wire harness coupling mode the sample port of electronic module is exerted an influence, electronic module is subjected to electromagnetic interference (EMI) post-sampling mistake can cause dysfunction, produces complaint after sale.Therefore, the development automotive electronic technology, the essential common problem that solves electronic product: Electro Magnetic Compatibility, the mutual electromagnetic that had both solved various appliance chambers is disturbed and anti-interference problem; The automobile electromagnetic compatibility is defined as: in automobile and space on every side thereof, in the regular hour (time of operation), under the available spectrum resources supplIes, automobile itself and consumer on every side thereof can coexist unlikely cause performance (function) degradation or forfeiture.For Hyundai Motor and following automobile, the automobile electromagnetic compatibility is most important.
Summary of the invention
Based on the problems referred to above, the invention provides a kind of body control system, it has advantages of higher stability, but the load of described relay output control unit drive part is worked on can break down at the micro-control unit of body control system the time.
Based on the problems referred to above, the invention provides a kind of body control system, it can monitor the output signal of described relay output control unit, when it the output that described micro-control unit when unusual is forbidden the corresponding relays output control unit occurs.
Based on the problems referred to above, the invention provides a kind of body control system, its can effectively reduce since described micro-control unit internal program operation exception with the body control system problem of unstable.
Based on the problems referred to above, the invention provides a kind of body control system, it has higher Electro Magnetic Compatibility.
For this reason, the invention provides a kind of body control system, comprising:
Input block is used for receiving inputted signal, and sends it to micro-control unit;
Micro-control unit is used for driving loaded work piece according to described input signal pilot relay output control unit;
Limping pattern control module is used for when described micro-control unit breaks down, and controls described relay output control unit drive part loaded work piece.
Wherein, when described micro-control unit operate as normal, described micro-control unit is forbidden the output of described limping pattern control module; Described limping pattern control module is the NAND gate circuit that is connected with described relay output control unit with described micro-control unit.
Preferably, described body control system also comprises the detection feedback unit, be used to detect the output signal of described relay output control unit, and detection signal fed back to described micro-control unit, described micro-control unit judges according to the detection signal of described feedback whether the output of described relay output control unit is normal, when described micro-control unit was judged described relay output control unit output abnormality, described micro-control unit was forbidden the output of described relay output control unit.
Preferably, described input block is built-in with Schmidt trigger, is used to filter undesired signal.
Preferably, be provided with the programmed protection unit in the described micro-control unit, be used for making described Program reset when program run in described micro-control unit is unusual, described programmed protection unit is the software watchdog timer.
With respect to prior art, the present invention has following beneficial effect:
Body control system provided by the invention, owing to set up limping pattern control module, and can be when described micro-control unit breaks down by means of this limping pattern control module, controlling the load of described relay output control unit drive part works on, can not move and be unlikely to make vehicle to be paralysed fully, thereby, the normal use of vehicle be can further guarantee, and the stability and the reliability of vehicle operating process improved.
In a preferred embodiment of the invention, owing to be provided with the detection feedback unit, thereby can when described relay output control unit output abnormality, failure message be fed back to described micro-control unit, make micro-control unit carry out respective handling according to described feedback information.Therefore, body control system provided by the present invention has advantages of higher stability.
In addition, in a preferred embodiment of the invention, the input block of body control system is built-in with Schmidt trigger, the effectively shake of trap signal and undesired signal, thereby improved the anti-electromagnetic interference (EMI) and the stability of this body control system, thereby make this body control system have higher Electro Magnetic Compatibility.
Description of drawings
Fig. 1 is the structured flowchart of body control system provided by the invention;
Fig. 2 is the circuit theory diagrams that comprise the body control system that detects feedback unit provided by the invention;
Fig. 3 is the decision logic figure of the micro-control unit in the body control system provided by the invention;
Fig. 4 is the circuit theory diagrams that comprise the body control system of limping pattern control module provided by the invention;
Fig. 5 is for drawing the power control circuit schematic diagram on the input block in the body control system provided by the invention;
Fig. 6 is the Schmidt trigger schematic diagram of the input block in the body control system provided by the invention;
Fig. 7 is the peripheral circuit diagram of a specific embodiment of the micro-control unit in the body control system provided by the invention.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, body control system provided by the invention is described in detail below in conjunction with accompanying drawing.
Fig. 1 is the structured flowchart of body control system provided by the invention.As shown in the figure; this body control system (BCM) comprises micro-control unit (MCU) 1, the input block 3 that is electrically connected with micro-control unit 1 and relay output control unit 4; be arranged on the programmed protection unit 2 in the micro-control unit 1, and be connected electrically in detection feedback unit 5 and limping pattern control module 6 between micro-control unit 1 and the relay output control unit 4.Wherein, input block 3 comprises manipulable switch on the vehicle, such as rising switch, the decline switch of vehicle window, light combined switch, windscreen wiper combined switch etc.; This body control system can comprise a plurality of relay output control units 4, and is equipped with detection feedback unit 5 between each relay output control unit 4 and micro-control unit 1.Input block 3 sends input signal to micro-control unit 1, and micro-control unit 1 drives loaded work piece according to described input signal pilot relay output control unit 4.Detect the output signal that feedback unit 5 detects relay output control unit 4 output terminals; and give micro-control unit 1 with described signal feedback; micro-control unit 1 is by comparator input signal and described feedback signal; whether the output of determining relay output control unit 4 occurs unusually, and micro-control unit 1 suspends or interrupt the output of relay output control unit 4 when appearance is unusual.When micro-control unit 1 breaks down can not work the time limping pattern control module 6 pilot relay output control units 4 drive part loaded work pieces.When the program run in the micro-control unit 1 was unusual, programmed protection unit 2 can make Program reset, to guarantee that system program normally moves, improved the stability of system.
As shown in Figure 2, be the circuit theory diagrams that comprise the body control system that detects feedback unit provided by the invention.Detection feedback unit 5 of the present invention be with micro-control unit 1 and relay output control unit 4 between the hardware diagnostic circuit that is connected, its by on draw power supply, pull-up resistor R, resistance R 1, R2 and capacitor C 1 to constitute, resistance R 1 first end is electrically connected with the output terminal of pull-up resistor R and control relay circuit, resistance R 2 is in parallel with capacitor C 1, an end that is connected in parallel is electrically connected other end ground connection with resistance R 1 second end and micro-control unit 1 (MCU).As shown in Figure 2, the output signal of relay output end mouth can be fed back to micro-control unit 1 (MCU) by this circuit, micro-control unit 1 passes through to compare the input signal of input port and the output signal of output port, can judge whether the output signal of relay output end mouth occurs unusually.
Be controlled to be example with power windows below, the diagnosis principle of micro-control unit 1 is described in conjunction with Fig. 3.MCU judges by comparator input signal and monitoring and detection feedback signal whether the relay output end mouth exists following fault: output circuit voltage height, output circuit voltage are low, output terminal open circuit, output terminal short circuit.If MCU judges the relay output end mouth and has fault, then can suspend or interrupt the output of relay, while record trouble sign indicating number, failure code is (only partial fault code) as shown in Table 1.
Table one
As shown in Figure 3, be the decision logic figure of the micro-control unit in the body control system provided by the invention.Comprise in the circuit theory diagrams of the body control system that detects feedback unit in the present invention shown in Figure 2, the wire harness input end has two states: low level, unsettled; And the signal that MCU receives has two states: low level, high level; Wherein high level signal is from drawing power supply on the MCU port.When the wire harness end has the low level signal input, 4 outputs of MCU control corresponding relays output control unit, it is effective to be output as high level, detect feedback circuit simultaneously and detect the high level signal that the output port existence continues, MCU judges relay (as Fig. 3 situation 1) working properly, if it is to draw supply voltage (V_pullup) on the diagnostic circuit that the detection feedback circuit detects output port voltage, MCU judges relay output end open circuit (as situation among Fig. 3 2); When the wire harness end is imported when unsettled, if relay output end mouth voltage is to draw supply voltage (V_pullup) on the diagnostic circuit, detecting feedback circuit detects output port and is similarly and draws supply voltage (V_pullup) on the diagnostic circuit, then MCU judges that relay normally disconnects (as situation among Fig. 3 3), detect the high level signal that the output port existence continues if detect feedback circuit, MCU judges relay short circuit, relay contact closed unusually (as situation among Fig. 3 4).
When MCU judges the relay output end open circuit (situation 2 in as Fig. 3), even the input signal continuous and effective, MCU is pilot relay work 8s only, stops to drive this relay afterwards, waits the effective input signal of the next one to be detected.When MCU judges the relay output end short circuit (situation 4 in as Fig. 3), forbid driving, simultaneously the record trouble code to this relay.
As shown in Figure 4, be the circuit theory diagrams that comprise the body control system of limping pattern control module provided by the invention.When break down on the BCM hardware circuit or software on when bugs (bug) occurring, BCM is with abnormal work or quit work, as: hardware circuit voltage transitions chip pin rosin joint can cause MCU to power, and then BCM can't work; Crystal oscillator match circuit components and parts rosin joint or virtual connection meeting cause crystal oscillator not worked, and then BCM can't working procedure; The signal that CAN transponder chip power pin rosin joint can cause transmitting on the CAN bus can't be indicated on instrument.Increase the limping mode control circuit on BCM, this circuit brings into operation when MCU does not work, and is the part electric power supply, guarantees its normal use in the vehicle operating process.As shown in Figure 4, the limping mode control circuit is set between control relay circuit and MCU, this limping mode control circuit comprises Sheffer stroke gate logic chip and pull-up circuit and pull-down circuit, the pin two of described Sheffer stroke gate logic chip is electrically connected with the pin two of MCU 5, the pin one 3 of described Sheffer stroke gate logic chip is electrically connected with the pin 33 of MCU, and the pin 8 of described Sheffer stroke gate logic chip is connected with described at least one control relay circuit by triode.The control principle of limping pattern is as described below:
In normal mode of operation, MCU controls its 25th pin and is changed to low level, and this moment, the 8th pin of Sheffer stroke gate logic chip was exported high level, and the triode (PNP) that the 8th pin is connected ends, and the load output of limping pattern is under an embargo.If MCU controls its 33rd pin and is changed to high level, the 11st pin of Sheffer stroke gate logic chip is a low level, and then MCU controls the I/O extended chip work that is used to export.If MCU controls its 33rd pin and is changed to unsettledly, the 11st pin of Sheffer stroke gate logic chip is a high level, and then MCU forbids the I/O extended chip work that is used to export.
And under the limping pattern, the 25th pin of MCU and the output of the 33rd pin no signal, Sheffer stroke gate logic chip outside by on draw and pull-down circuit control Sheffer stroke gate logic chip the 8th pin output low level, the triode (PNP) that the 8th pin is connected is opened, and the load output of limping pattern is started working.The logic true value table sees Table two:
Table two: limping pattern control output truth table
In the present embodiment, the micro-control unit 1 of BCM adopts MCU (microprocessor) MC9S08DZ60 of FREESCALE, and the I/O extended chip adopts the 74HCT573 of ST, and the Sheffer stroke gate logic chip adopts 74HC00.Wherein, as shown in Figure 7 as the peripheral circuit of the microprocessor MC9S08DZ60 of a specific implementation of micro-control unit.Certainly can be according to actual needs, according to limping pattern control principle provided by the invention, adopt the microprocessor of other model and I/O extended chip and Sheffer stroke gate logic chip to design corresponding circuit, realize the control of limping pattern.
In order to improve the stability of body control system, the present invention is provided with programmed protection unit 2 in micro-control unit 1.Wherein, programmed protection unit 2 can be realized by software watchdog system.When program run was unusual, the watchdog system timer overflowed and forced system resets, and system program will bring into operation from the program origin.When program is normally moved, cause system reset in order to prevent that the watchdog system timer from overflowing, MCU will regularly reset to the watchdog system timer.Can forbid watchdog system work by the COPT position that empties on the register SOPT1.The watchdog system clock can be selected system clock or 1-kHz clock for use, and the software watchdog system of body control system of the present invention adopts 1-kHz clock, WatchDog Timer count cycle part table three
Table three
The factor that influences body control system stability is except the problem of the modular design of body control system own, and topmost is exactly the anti-electromagnetic interference (EMI) of system.For this reason, in the input block 3 of body control system provided by the invention, be provided with Schmidt trigger, the principle of work of Schmidt trigger as shown in Figure 6, by different trigger voltages can filtered input signal shake and undesired signal, the dutycycle that can regulate square wave easily by the restriction of regulating trigger voltage simultaneously.
The signal that input block 3 is gathered mainly comprises digital signal, simulating signal, CAN signal and LIN signal, digital signal is mainly switching value, useful signal is high level or low level, after MCU collects useful signal, signal is carried out analyzing and processing, arrive undesired signal in order to prevent MCU at the I/O port processing when input signal cancellation back, guarantee that the I/O port is a kind of in following three kinds of states: high level, low level and high-impedance state; For the effective digital input signals of high level, after the input signal cancellation, BCM inside is changed to low level by pull down resistor with this port; For the effective digital input signals of low level, after the input signal cancellation, BCM inside is changed to high level by pull-up resistor with this port; BCM input port sampling processing, on draw power supply to adopt control mode among Fig. 5, on draw the output-controlled of power supply in the I/O of MCU port, MCU port output frequency is the high level pulse of 100Hz, the high level pulse sequence is the high level pulse sequence of supply voltage and same frequency through forming peak value behind the amplifying circuit, Dui Ying MCU sampling policy is designed to gather a port input signal every 10ms with it, 3 input signals of MCU continuous acquisition, if the continuous signal of being gathered for 3 times is a low level, then MCU judges effective low level signal input, if the continuous signal of being gathered for 3 times is not low level entirely, then MCU is judged as does not have effective input signal, thereby suppresses the noise on the input port.
In addition, because BCM had both controlled high-power electric appliance load on the vehicle (such as the defrosting of: rear windshield glass, power windows) output, (as: door-lock motor is actuation time: input 200ms) to control the short-term operation load again, and can produce bigger pulse current during the loaded work piece of short-term operation, when high power load is exported, BCM inside has big electric current to pass through, if have bigger pulse current then can be to causing damage on the BCM hardware this moment, therefore disposing MCU makes it forbid high power load output in short-time load work, after the short-time load action stopped, high power load recovered normal output.
Be understandable that above embodiment only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement also are considered as protection scope of the present invention.
Claims (10)
1. body control system is characterized in that comprising:
Input block is used for receiving inputted signal, and sends it to micro-control unit;
Micro-control unit is used for driving loaded work piece according to described input signal pilot relay output control unit;
Limping pattern control module is used for when described micro-control unit breaks down, and controls described relay output control unit drive part loaded work piece.
2. body control system as claimed in claim 1 is characterized in that, when described micro-control unit operate as normal, described micro-control unit is forbidden the output of described limping pattern control module.
3. body control system as claimed in claim 1 is characterized in that, described limping pattern control module is the NAND gate circuit that is connected with described relay output control unit with described micro-control unit.
4. body control system as claimed in claim 1 is characterized in that also comprising:
Detect feedback unit, be used to detect the output signal of described relay output control unit, and detection signal fed back to described micro-control unit, described micro-control unit judges according to the detection signal of described feedback whether the output of described relay output control unit is normal.
5. body control system as claimed in claim 4 is characterized in that, when described micro-control unit was judged described relay output control unit output abnormality, described micro-control unit was forbidden the output of described relay output control unit.
6. body control system as claimed in claim 1 is characterized in that described input block is built-in with Schmidt trigger, is used to filter undesired signal.
7. body control system as claimed in claim 1 is characterized in that, is provided with the programmed protection unit in the described micro-control unit, is used for program run in described micro-control unit and makes described Program reset when unusual.
8. body control system as claimed in claim 7 is characterized in that, described programmed protection unit is the software watchdog timer.
9. body control system as claimed in claim 1 is characterized in that, the quantity of described relay output control unit is at least one.
10. body control system as claimed in claim 4, it is characterized in that, described detection feedback unit is the hardware diagnostic circuit that is arranged between described micro-control unit and the described relay output control unit, is used to detect the output signal of described relay output control unit output terminal.
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| CN 201010601671 CN102063121A (en) | 2010-12-16 | 2010-12-16 | Automobile body control system |
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Cited By (14)
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| CN104369713A (en) * | 2014-11-06 | 2015-02-25 | 联合汽车电子有限公司 | Electronic steering column lock control device and control method thereof |
| CN104375441A (en) * | 2014-11-06 | 2015-02-25 | 联合汽车电子有限公司 | Vehicle-mounted power source management device and control method thereof |
| CN104417452A (en) * | 2013-09-09 | 2015-03-18 | 大陆汽车投资（上海）有限公司 | Automobile limp home control circuit |
| CN105882421A (en) * | 2016-04-20 | 2016-08-24 | 北京长城华冠汽车科技股份有限公司 | Limp control system and limp control method for electric automobile and electric automobile |
| CN105955244A (en) * | 2016-06-13 | 2016-09-21 | 宁波市鄞州雪利曼电子仪表有限公司 | Can bus system and control method thereof |
| CN106292434A (en) * | 2016-08-19 | 2017-01-04 | 东风汽车公司 | A kind of watchdog circuit for automobile electronic controller |
| CN106354121A (en) * | 2016-10-19 | 2017-01-25 | 交控科技股份有限公司 | Safety control circuit, multi-path control circuit and control method |
| CN106593147A (en) * | 2015-10-16 | 2017-04-26 | 联合汽车电子有限公司 | Passenger car door lock control unit |
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| CN106933217A (en) * | 2017-04-05 | 2017-07-07 | 武汉南斗六星系统集成有限公司 | A kind of automatic checkout equipment of central vehicle control unit |
| CN107957963A (en) * | 2016-10-18 | 2018-04-24 | 佛山市顺德区美的电热电器制造有限公司 | IO output ports expanded circuit and household electrical appliance |
| CN113147633A (en) * | 2021-04-13 | 2021-07-23 | 联合汽车电子有限公司 | Power distribution module and automobile body controller |
| CN113296431A (en) * | 2021-04-19 | 2021-08-24 | 东风汽车集团股份有限公司 | Limp home control circuit for automobile electronic controller |
| CN114679374A (en) * | 2020-12-24 | 2022-06-28 | 上海汽车集团股份有限公司 | Reset control method and device and electronic equipment |
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Application publication date: 20110518 |