CN102806900B - Vacuum assist brake controller for electric automobile - Google Patents
Vacuum assist brake controller for electric automobile Download PDFInfo
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Abstract
The invention relates to a vacuum assist brake controller for an electric automobile. The controller comprises a power-switching circuit, a micro-control chip circuit, a pressure switching signal collecting circuit, a pressure sensing signal collecting circuit, a CAN (Controller Area Network) communication circuit, a vacuum pump driving circuit, a voltage monitoring circuit and a current monitoring circuit. The pressure signal collecting part of the controller adopts a redundant collecting mode of a pressure switch and a pressure sensor to be realized, and the accuracy of the collected signals is furthest ensured. A driving current feedback circuit is integrated in a chip of a driving part, so that the controller has a high current bearing capacity and meanwhile the real-time monitoring of driving current is realized, and the monitoring capacity of the controller is increased. A power supply chip and the micro-control chip realize mutual monitoring through a hardware watchdog and the voltage monitoring circuit, so that the reliability and the safety of the controller are increased. The controller ensures the safety and the reliability of a vehicle braking system in the premise that a vacuum assist function is realized.
Description
Technical field
The present invention relates to the vacuum-assisted brake technical field of electronlmobil, relate in particular to a kind of vacuum-assisted brake controller that comprises the multiple safe designs such as the collection of pressure signal redundancy, microcontroller chip monitoring, power line voltage monitoring and drive current monitoring and applicable braking system of electric car thereof.
Background technology
The reliability of brake system and the safety performance of car load are closely bound up, and current electronlmobil is general adopts vacuum-assisted means structure brake system to realize car load braking function.Vacuum booster forms airtight connected space by rubber breather pipe and vacuum reservoir, and vacuum-assisted brake controller is monitored the pressure signal in vacuum reservoir by pressure-sensitive component, and drives vacuum pump work to carry out vacuum pumping to vacuum reservoir confined space.In the time that chaufeur is trampled brake pedal, will obtain the brake boost being provided by vacuum reservoir negative pressure confined space, when negative pressure is not enough, vacuum pump carries out vacuum pumping to vacuum reservoir, maintains the negative pressure state of vacuum reservoir inner space.
Chinese invention patent has been announced and a kind ofly under instantaneous large-current condition, has been avoided burning out, electric motor car power assisting easy to maintenance is braked vacuum-assisted brake controller (Zhang Xinghai used, Huang Chenggang. electric motor car power assisting is braked electric vacuum booster brake controller used, application number 200920128225.X, the applying date: 2009.07.29).This controller utilizes pressure sensor circuit changing switch to gather vacuum reservoir internal pressure signal, then builds latching circuit by double relay and complete the driving control to vaccum pump motor.It can drive vaccum pump motor safely and effectively according to pressure signal threshold value, and the driving circuit that relay builds has improved the current load ability of pure single chip circuit; Control system assembly is relatively independent, only needs to change the device losing efficacy when damage, has saved maintenance cost.But there is following some deficiency in this vacuum-assisted brake controller: the acquisition of signal part of (1) controller adopts mechanical pressure switches to realize, such acquisition of signal mode may cause the dysfunction of brake system under special operation condition (as the unexpected pressure switch causing misleads, service life is long or car load is braked the frequent mechanical fatigue causing etc.), has certain potential safety hazard; (2) controller does not have corresponding monitoring means for system core parameter (controller power source service voltage, vacuum pump drive current, vacuum pump extracting vacuum efficiency etc.), when brake system defective mode occurs, can not carry out in time, effectively process, make system robustness lower, greatly increased the potential safety hazard that battery-driven car travels; (3) controller is not containing micro-control circuit and communicating circuit, hinder the realization of the Premium Features such as complex control strategy, the output of brake system diagnostic code and the collection of driver drives vehicle braking-distance figures, limit the further lifting of controller function, performance, made car load brake system safety, intelligent lower.
Summary of the invention
In order to improve the safety, intelligent of electric automobile whole brake system, the invention provides a kind of pressure switch that adopts with pressure sensor redundancy collection vacuum reservoir internal pressure signal, monitor microcontroller chip state, Real-Time Monitoring power line voltage and drive current in real time, and to corresponding critical data analyze, the vacuum-assisted brake controller for electronlmobil of processing and communication.
Vacuum-assisted brake controller for electronlmobil comprises power-switching circuit 1, microcontroller chip circuit 2, pressure switch signal acquisition circuit 3, pressure sensor signal Acquisition Circuit 4, CAN communicating circuit 5, vacuum pump driving circuit 6, electric voltage observation circuit 7 and current monitoring circuit 8; Described power-switching circuit 1 carries out after voltage stabilizing is changed powering into microcontroller chip circuit 2, pressure switch signal acquisition circuit 3, pressure sensor signal Acquisition Circuit 4 and CAN communicating circuit 5 to outer power voltage; Microcontroller chip circuit 2 carries out redundancy collection by pressure switch signal acquisition circuit 3 and pressure sensor signal Acquisition Circuit 4 to vacuum reservoir 12 internal pressure signals, when detecting that vacuum reservoir 12 negative pressure value enable vacuum pump driving circuit 6 when not enough, make vaccum pump motor carry out vacuum pumping; In the time that negative pressure value is excessive, stop enabling vacuum pump driving circuit 6; In whole process, microcontroller chip circuit 2 is monitored power line voltage, drive current size and time respectively by electric voltage observation circuit 7 and current monitoring circuit 8, and will after gather key parameter coding, be transferred to CAN bus by CAN communicating circuit 5, report entire car controller, finally show in electrodynamic instrument early warning.
Described power-switching circuit 1 is made up of two parts, the first half is the voltage conversion circuit of turn+5V of Vehicular accumulator cell direct current+12V, it is made up of power supply voltage stabilizing chip U1, diode D1, TVS pipe D2, filter capacitor C3, C5, C6, C7, C8, realize the conversion to storage battery+12V voltage, provide stable+5V voltage to follow-up multiple digit chips; The latter half is pressure sensor voltage follower circuit, described sensor voltage is followed circuit and is made up of voltage follow chip U4, divider resistance R14, R15, filter capacitor C18, C19, C20, C21, provide the independent power supply of external pressure sensor to supply with, to reduce the electrical couplings of pressure sensor signal Acquisition Circuit and other circuit.
Described microcontroller chip circuit 2 is made up of 8 microcontroller chip U2 and basic peripheral interface circuit thereof, and peripheral interface circuit comprises chip power circuit, 16MHz crystal oscillating circuit, reference circuits, reset circuit, in order to drive 8 microcontroller chip U2 normally to work.
Described pressure switch signal acquisition circuit 3 is made up of catching diode group D4, divider resistance R7, R8, R11, pull-up resistor R5, filter capacitor C15, C17 and aerotron T1, main realization detected the bound force value of having demarcated in advance in vacuum reservoir 12: pressure switch signal voltage logical value characterizes vacuum reservoir negative pressure value deficiency for " 1 ", pressure switch signal voltage logical value is that " 0 " characterizes vacuum reservoir negative pressure value abundance, and then is detected by microcontroller chip circuit 2.Wherein by divider resistance being arranged to suitable resistance proportioning, microcontroller chip circuit 2 can be identified the switch situation of misleading being caused by water inlet.
Described pressure sensor signal Acquisition Circuit 4 is made up of catching diode group D5, pull-up resistor R13, current limliting R17 and filter capacitor C22, C23, and clamper, impurity elimination ripple that main circuit will be realized pressure sensor signal Sensor are processed and gathered.
Described CAN communicating circuit 5 is made up of CAN transceiver U6, common mode choke L1, disturbance rejection aerotron D7, resistance R 21, R23, R25, R26, capacitor C 28, C29, C30, realizes the data interaction between controller and CAN bus.
Described vacuum pump driving circuit 6 is made up of the first motor drive ic U5, the second motor drive ic U7, aerotron T2, diode D6, resistance R 19, R20, R24, capacitor C 24, C25, realizes the driving of microcontroller chip circuit 2 to vaccum pump motor.
Described electric voltage observation circuit 7 is made up of divider resistance R16, R18, capacitor C 24, realizes the monitoring of microcontroller chip circuit 2 to power conversion chip output voltage.
Described current monitoring circuit 8 is made up of catching diode group D3, resistance R 9, R10, capacitor C 14, C16, driving current signal is become to voltage signal and gathered by microcontroller chip circuit 2, realize the real-time monitoring of microcontroller chip circuit 2 to drive current size and time length.
The model of described power supply voltage stabilizing chip U1 is TLE4268.
The model of described voltage follow chip U4 is TLE4250.
The model of described 8 microcontroller chip U2 is MC9S08DZ60.
Described the first motor drive ic U5 and the second motor drive ic U7 are intelligent flash source switch BTS443P.
The model of described CAN transceiver U6 is TJA1040.
The present invention compares with prior art products and has advantages of following aspect:
1. the pressure signal collecting part of controller of the present invention adopts the mode of pressure switch and the collection of pressure sensor redundancy to realize, and ensures to greatest extent the accuracy of Information Monitoring;
2. the drive part of controller of the present invention is selected two vacuum pump motor drive ics, and its inner integrated drive current reactive circuit has been realized the monitoring of controller to drive current size and two key parameters of time length, has improved the monitoring power of controller;
3. the power supply chip of controller of the present invention and microcontroller chip are monitored mutually by hardware watchdog and electric voltage observation circuit, have promoted reliability and the robustness of controller;
4. the present invention is optimized design from the angle of vacuum-assisted brake controller secure design to controller hardware, has ensured safety, the reliability of car load brake system under the prerequisite that realizes vacuum servo function.
Brief description of the drawings
Fig. 1 is that the present invention is for braking system of electric car block diagram.
Fig. 2 is the overall block diagram of controller hardware of the present invention.
Fig. 3 is the power-switching circuit schematic diagram of Fig. 2.
Fig. 4 is the microcontroller chip schematic circuit diagram of Fig. 2.
Fig. 5 is the pressure switch signal acquisition circuit schematic diagram of Fig. 2.
Fig. 6 is the pressure sensor signal Acquisition Circuit schematic diagram of Fig. 2.
Fig. 7 is the CAN communicating circuit schematic diagram of Fig. 2.
Fig. 8 is the driving circuit principle figure of Fig. 2.
Fig. 9 is the electric voltage observation circuit schematic diagram of Fig. 2.
Figure 10 is the current monitoring circuit schematic diagram of Fig. 2.
Sequence number in upper figure: power-switching circuit 1, microcontroller chip circuit 2, pressure switch signal acquisition circuit 3, pressure sensor signal Acquisition Circuit 4, CAN communicating circuit 5, vacuum pump driving circuit 6, electric voltage observation circuit 7, current monitoring circuit 8, brake pedal 10, vacuum booster 11, vacuum reservoir 12, vacuum-assisted brake controller 13, vacuum pump 14, entire car controller 15, electrodynamic instrument 16, storage battery 17, rubber tubing 18, CAN communication bus 19.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.
Embodiment:
Referring to Fig. 1, the braking system of electric car of embodiment comprises brake pedal 10, vacuum booster 11, the vacuum reservoir 12 that contains pressure switch and pressure sensor, vacuum-assisted brake controller 13, vacuum pump 14, entire car controller 15, electrodynamic instrument 16, storage battery 17, rubber tubing 18 and CAN communication bus 19.Wherein between brake pedal 10, vacuum booster 11, vacuum reservoir 12 and vacuum pump 14, connect into connected space with rubber tubing 18, after vacuum pump completes vacuum pumping, with this negative pressure connected space, chaufeur is trampled to brake pedal action brake boost is provided.Brake pedal 10 between any two all utilizes check valve to realize air nonreturn flow with vacuum reservoir 12 and vacuum reservoir 12 with vacuum pump 14 with vacuum booster 11, vacuum booster 11, the direction of arrow of rubber tubing 18 characterizes the flow direction of air, for example: in the time that chaufeur is trampled brake pedal action generation, air flows into vacuum booster 11 by the atmosphere of brake pedal 10 outsides; In the time that the action of chaufeur loosen the brake occurs, the air of vacuum booster 11 flows into vacuum reservoir 12; In the time that the interior negative pressure value of vacuum reservoir 12 is not enough, vacuum pump carries out vacuum pumping to vacuum reservoir, and air flows into vacuum pump 14 by vacuum reservoir 12, and in vacuum reservoir, subnormal ambient maintains preferably scope all the time thus.Wherein comprise between vacuum reservoir 12, vacuum-assisted brake controller 13, vacuum pump 14 and the storage battery 17 of pressure switch and pressure sensor and implement electrical connection with low voltage wiring harness, for example, so as to realizing pressure signal collection, vacuum pump driving, power supply supply action: the power supply that can realize vacuum-assisted brake controller 13, vacuum pump 14, entire car controller 15, electrodynamic instrument 16 by storage battery 17 is supplied with; Can realize the collection to the pressure switch in vacuum reservoir 12, pressure sensor signal by vacuum-assisted brake controller, and driving to vacuum pump 14.Wherein between vacuum-assisted brake controller 13, entire car controller 15 and electrodynamic instrument 16, the part CAN network for car load CAN topology is connected, the CAN node of network that wherein vacuum-assisted brake controller 13 and electrodynamic instrument 16 are entire car controller, entire car controller is higher level function unit.
Referring to Fig. 2, vacuum-assisted brake controller 13 comprises power-switching circuit 1, microcontroller chip circuit 2, pressure switch signal acquisition circuit 3, pressure sensor signal Acquisition Circuit 4, CAN communicating circuit 5, vacuum pump driving circuit 6, electric voltage observation circuit 7 and current monitoring circuit 8.By power-switching circuit 1 ,+12V outer power voltage being converted to stable+5V voltage, is the CAN transceiver power supply in the catching diode group in microcontroller chip circuit 2, pressure switch signal acquisition circuit 3 thereafter, catching diode group in pressure sensor signal Acquisition Circuit 4 and pull-up resistor, CAN communicating circuit 5; Microcontroller chip circuit 2 is the peripheral interface circuit of the normal work of microcontroller chip; Microcontroller chip carries out redundancy collection by pressure switch signal acquisition circuit 3 and pressure sensor signal Acquisition Circuit 4 to vacuum reservoir internal pressure signal, in the time detecting negative pressure value deficiency, enables vacuum pump driving circuit 6, allows vacuum pump carry out vacuum pumping; In the time that negative pressure value is enough large, stop enabling driving circuit 6.In whole process, microcontroller chip is monitored power line voltage, drive current respectively by electric voltage observation circuit 7 and current monitoring circuit 8, and by being transferred to CAN bus by CAN communicating circuit 5 after gathered important parameter coding, inform the entire car controller 15 of higher category in Full Vehicle System.
Referring to Fig. 3, the first half of power-switching circuit 1 is+voltage conversion circuit of turn+5V of 12V, the latter half is+5V voltage follower circuit.Voltage conversion circuit is made up of power supply voltage stabilizing chip U1, diode D1, TVS pipe D2, filter capacitor C3, C5, C6, C7, C8.Wherein, the model of power supply voltage stabilizing chip U1 is TLE4268, realizes the voltage stabilizing conversion to storage battery+12V voltage, is each active chip, clamper tube positive pole and provide+5V of the pull-up resistor power supply of controller.Power supply chip built in hardware watchdog circuit, can Real-Time Monitoring microcontroller chip U2 whether in normal working, in the time that microcontroller chip U2 is abnormal, power supply voltage stabilizing chip U1 carries out reset operation by its pin output low level signal to microcontroller chip U2, resetting forms diagnostic code for 3 times and reports entire car controller 15 via CAN communicating circuit 5, and then by electrodynamic instrument 16, chaufeur is carried out to early warning.Voltage follower circuit provides external pressure sensor+5V power supply to supply with, formed by voltage follow chip U4, divider resistance R14, R15, filter capacitor C18, C19, C20, C21, wherein voltage follow chip U4TLE4250 using through conversion+5V voltage through relatively, purify after as pressure sensor power line voltage SensorPower, prevent from, by high power load vacuum pump 14 power pollution causing of working, ensureing the accuracy of pressure sensor signal.
Referring to Fig. 4, microcontroller chip circuit 2 is recommended circuit layout (referring to the 30th page, MC9S08DZ60 chip data handbook) referring to Freescale official databook, formed by 8 microcontroller chip U2 and basic peripheral interface circuit thereof, peripheral interface circuit comprises that chip power circuit, 16MHz crystal oscillating circuit, reference circuits, reset circuit and program write with a brush dipped in Chinese ink circuit, in order to ensure the normal work of 8 microcontroller chip U2.Wherein chip power circuit is made up of filter capacitor C1, C2, C9, C10, in order to provide power supply to supply with to chip; Crystal oscillating circuit is by low inductive R1, R2, and typical capacitance is at C1, C2 and a crystal-vibration-chip U3 composition of 5pF to 25pF, for 8 microcontroller chip U2 provide outside concussion source; Reset circuit is made up of 0 Ω resistance R 4, pull-up resistor R3 and filter capacitor C13, in the time of 8 microcontroller chip U2 abnormal states, can receive the reset signal from power supply chip; Program is write with a brush dipped in Chinese ink electric routing program and is write with a brush dipped in Chinese ink a J1, pull-up resistor BKGD formation, writes with a brush dipped in Chinese ink interface for 8 microcontroller chip U2 provide the outside of application program.
Referring to Fig. 5, pressure switch signal acquisition circuit 3 is made up of catching diode group D4, divider resistance R7, R8, R11, pull-up resistor R5, filter capacitor C15, C17 and aerotron T1, and Switch1 is pressure switch signal, and SW is pressure logical signal.Be 2.2:1:1 by the resistance proportioning that R7, R8, a R113 divider resistance are set, the mislead prevention of failure mode of the switch that can cause being intake by pressure.The working process of pressure switch signal acquisition circuit 3 is: in the time that the interior negative pressure value of vacuum reservoir 12 is sufficient, pressure switch conducting makes aerotron T1 conducting, and pressure logical signal SW is logical zero and is gathered by microcontroller chip circuit 2; In the time that the interior negative pressure value of vacuum reservoir 12 is not enough, pressure switch becomes disconnection from conducting state, makes aerotron T1 cut-off, and pressure logical signal SW is logical one by be pulled to+5V of pull-up resistor R5, is gathered by microcontroller chip circuit 2.
Referring to Fig. 6, pressure sensor signal Acquisition Circuit 4 is made up of catching diode group D5, pull-up resistor R13, current-limiting resistance R17 and filter capacitor C22, C23, and Sensor is pressure sensor signal, and SE is pressure simulation signal.Clamp, the filtering of this partial circuit to pressure sensor signal Sensor, final output area is gathered by microcontroller chip circuit 2 to the pressure simulation signal SE of+5V scope 0.
Referring to Fig. 7, CAN communicating circuit 5 is recommended circuit layout (referring to the 8th page, TJA1040 chip data handbook) with Philips Semiconductors official databook, be made up of CAN transceiver U6, common mode choke L1, disturbance rejection aerotron D7, resistance R 21, R23, R25, R26, capacitor C 28, C29, C30, wherein the model of CAN transceiver U6 is TJA1040.This partial circuit is a kind of universal standard circuit, is the interface between controller local area network's (CAN) protocol controller and physical bus, and being mainly controller provides difference to send data to CAN bus and the differential received data ability to CAN controller.Common and different mode when wherein common mode choke and disturbance rejection aerotron are used for reducing CAN high speed data transmission between height data line disturbs, and improves the accuracy of data message.
Referring to Fig. 8, vacuum pump driving circuit 6 by the first motor drive ic U5, the second motor drive ic U7, aerotron T2, hold stream diode D6, resistance R 19, R20, R24, filter capacitor C25, C27 and form, IN_DO is vacuum pump control signal, IN is the first motor drive ic U5, the second motor drive ic U7 enable signal, and M+ is vacuum pump drive signal.The working process of vacuum pump driving circuit 6 is: the common input and output pin of microcontroller chip circuit 2 is as controller for vacuum pump signal IN_DO output+5V voltage, make aerotron T2 conducting, the first motor drive ic U5, the second motor drive ic U7 enable signal IN drags down effectively, enable the first motor drive ic U5, the second motor drive ic U7 internal fet conducting, final outer power voltage and vacuum pump drive signal M+ connect, vacuum pump starts vacuum pumping wherein, the first motor drive ic U5, the second motor drive ic U7 is intelligent flash source switch BTS443P (referring to official of Infineon databook), the distinctive current feedback pin of this chip IS can export with the electric current of vacuum pump drive signal M+ and become the electric current that exact linear relationship and ratio are 8000 to 1, that utilizes that current monitoring circuit 10 can be easy realizes the monitoring of controller to vacuum pump drive signal M+ electric current.
Referring to Fig. 9, electric voltage observation circuit 7 to by after power-switching circuit+5V voltage monitors.Electric voltage observation circuit 7 is made up of divider resistance R16, R18, filter capacitor C24, voltage stabilizing chip output voltage values is (5V ± 0.1V), the receiver voltage scope of 8 microcontroller chip U2 pins is 0 arrive+5V, utilizes R16, R18 to carry out simple dividing potential drop and can realize the output voltage monitoring of 8 microcontroller chip U2 to power supply voltage stabilizing chip U1.In the time that power supply voltage stabilizing chip U1 output voltage is abnormal, microcontroller chip circuit 2 stops the dog feeding operation to it, and the 3# pin REST of power supply voltage stabilizing chip U1 drags down the external reset pin that enables microcontroller chip circuit 2 thus.Wherein, microcontroller chip circuit 2 stops informing that by CAN communicating circuit 5 entire car controller 15 vacuum-assisted brake controllers 13 are by reset and by its counting in the front some cycles of hello dog action, if vacuum-assisted brake controller 13 is exceeded 3 times by external reset in the short period, entire car controller 15 sends the highlighted request message of warning light to electrodynamic instrument 16 by CAN communication bus 19, thus chaufeur is carried out to early warning.
Referring to Figure 10, current monitoring circuit 8 is the failure mode apparently higher than vacuum pump rated operational current in order to the vacuum pump drive current M+ that prevents unexpected operating mode (as stuck in vaccum pump motor) and caused.Current monitoring circuit 8 is made up of catching diode group D3, divider resistance R9, R10, filter capacitor C14, C16, and IS is the feedback current of vacuum pump drive current M+, and IS_AI is feedback current analog signal.This circuit will become and load on R10 terminal voltage signal after feedback current IS filtering, then gathers by the input and output pin that is had an AD ability in sampling by 8 microcontroller chip U2 after clamp, filtering.
Claims (6)
1. for the vacuum-assisted brake controller of electronlmobil, it is characterized in that: comprise power-switching circuit (1), microcontroller chip circuit (2), pressure switch signal acquisition circuit (3), pressure sensor signal Acquisition Circuit (4), CAN communicating circuit (5), vacuum pump driving circuit (6), electric voltage observation circuit (7) and current monitoring circuit (8); To outer power voltage, voltage stabilizing is microcontroller chip circuit (2), pressure switch signal acquisition circuit (3), pressure sensor signal Acquisition Circuit (4) and CAN communicating circuit (5) power supply after changing to described power-switching circuit (1); Microcontroller chip circuit (2) carries out redundancy collection by pressure switch signal acquisition circuit (3) and pressure sensor signal Acquisition Circuit (4) to brake vacuum tank internal pressure signal, when detecting that brake vacuum tank negative pressure value enables vacuum pump driving circuit (6) when not enough, makes vaccum pump motor carry out vacuum pumping; In the time that negative pressure value is excessive, stop enabling vacuum pump driving circuit (6); In whole process, microcontroller chip circuit (2) is monitored power line voltage, drive current size and time respectively by electric voltage observation circuit (7) and current monitoring circuit (8), and will after gather key parameter analysis, coding, be transferred to CAN bus by CAN communicating circuit (5), report entire car controller, finally show in electrodynamic instrument early warning;
Described power-switching circuit (1) is made up of two parts, the first half is the voltage conversion circuit of turn+5V of Vehicular accumulator cell direct current+12V, it is made up of power supply voltage stabilizing chip U1, diode D1, TVS pipe D2, filter capacitor C3, C5, C6, C7, C8, realize the conversion to storage battery+12V voltage, provide stable+5V voltage to follow-up multiple digit chips; The latter half is pressure sensor voltage follower circuit, described sensor voltage is followed circuit and is made up of voltage follow chip U4, divider resistance R14, R15, filter capacitor C18, C19, C20, C21, provide the independent power supply of external pressure sensor to supply with, to reduce the electrical couplings of pressure sensor signal Acquisition Circuit and other circuit;
Described microcontroller chip circuit (2) is made up of 8 microcontroller chip U2 and basic peripheral interface circuit thereof, peripheral interface circuit comprises chip power circuit, 16MHz crystal oscillating circuit, reference circuits, reset circuit, in order to drive 8 microcontroller chip U2 normally to work;
Described pressure switch signal acquisition circuit (3) is made up of catching diode group D4, divider resistance R7, R8, R11, pull-up resistor R5, filter capacitor C15, C17 and aerotron T1, main realization detected the bound force value of having demarcated in advance in vacuum reservoir (12): pressure switch signal voltage logical value characterizes vacuum reservoir negative pressure value deficiency for " 1 ", pressure switch signal voltage logical value is that " 0 " characterizes vacuum reservoir negative pressure value abundance, and then is detected by microcontroller chip circuit (2);
Wherein by divider resistance being arranged to suitable resistance proportioning, microcontroller chip circuit (2) can be identified the switch situation of misleading being caused by water inlet;
Described pressure sensor signal Acquisition Circuit (4) is made up of catching diode group D5, pull-up resistor R13, current limliting R17 and filter capacitor C22, C23, and clamper, impurity elimination ripple that main circuit will be realized pressure sensor signal Sensor are processed and gathered;
Described CAN communicating circuit (5) is made up of CAN transceiver U6, common mode choke L1, disturbance rejection aerotron D7, resistance R 21, R23, R25, R26, capacitor C 28, C29, C30, realizes the data interaction between controller and CAN bus;
Described vacuum pump driving circuit (6) is made up of the first motor drive ic U5, the second motor drive ic U7, aerotron T2, diode D6, resistance R 19, R20, R24, capacitor C 27, C25, realizes the driving of microcontroller chip circuit (2) to vaccum pump motor;
Described electric voltage observation circuit (7) is made up of divider resistance R16, R18, capacitor C 24, realizes the monitoring of microcontroller chip circuit (2) to power conversion chip output voltage;
Described current monitoring circuit (8) is made up of catching diode group D3, resistance R 9, R10, capacitor C 14, C16, driving current signal is become to voltage signal and gathered by microcontroller chip circuit (2), realize the real-time monitoring of microcontroller chip circuit (2) to drive current size and time length.
2. the vacuum-assisted brake controller for electronlmobil according to claim 1, is characterized in that: the model of described power supply voltage stabilizing chip U1 is TLE4268.
3. the vacuum-assisted brake controller for electronlmobil according to claim 1, is characterized in that: the model of described voltage follow chip U4 is TLE4250.
4. the vacuum-assisted brake controller for electronlmobil according to claim 1, is characterized in that: the model of described 8 microcontroller chip U2 is MC9S08DZ60.
5. the vacuum-assisted brake controller for electronlmobil according to claim 1, is characterized in that: described the first motor drive ic U5 and the second motor drive ic U7 are intelligent flash source switch BTS443P.
6. the vacuum-assisted brake controller for electronlmobil according to claim 1, is characterized in that: the model of described CAN transceiver U6 is TJA1040.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210290307.0A CN102806900B (en) | 2012-08-16 | 2012-08-16 | Vacuum assist brake controller for electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210290307.0A CN102806900B (en) | 2012-08-16 | 2012-08-16 | Vacuum assist brake controller for electric automobile |
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| CN102806900A CN102806900A (en) | 2012-12-05 |
| CN102806900B true CN102806900B (en) | 2014-09-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103318164A (en) * | 2013-06-20 | 2013-09-25 | 东南（福建）汽车工业有限公司 | Monitoring and warning system for electric automobile vacuum boosting device |
| CN103481883B (en) * | 2013-09-24 | 2016-06-08 | 湖南南车时代电动汽车股份有限公司 | The vacuum boost system of a kind of electric automobile and method thereof |
| CN104369732B (en) * | 2014-11-03 | 2016-12-07 | 重庆小康工业集团股份有限公司 | Controlling alarm managing device for electric automobile force aid system |
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