CN207311404U - Line traffic control Pneumatic braking system controller - Google Patents
Line traffic control Pneumatic braking system controller Download PDFInfo
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- CN207311404U CN207311404U CN201721333405.2U CN201721333405U CN207311404U CN 207311404 U CN207311404 U CN 207311404U CN 201721333405 U CN201721333405 U CN 201721333405U CN 207311404 U CN207311404 U CN 207311404U
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Abstract
A kind of line traffic control Pneumatic braking system controller described in the utility model, is made of main control chip unit, operator brake signal gathering unit, pressure signal collecting unit, ABS solenoid-drivens unit, preceding bridge module driving unit and rear axle module driving unit；Compared with conventional gas brake system controller, by the way that each functional circuit of controller is integrated, its integrated level is higher, small volume, and function is more, disclosure satisfy that current line traffic control Pneumatic braking system multi-signal collection, solenoid-driven etc. are more multi-functional.
Description
Technical field
The utility model belongs to brake system of car controller field, more specifically to a kind of line traffic control air-pressure brake
System controller.
Background technology
Brake system of car is the important component of automobile chassis, and the performance of braking system is to travel safety, behaviour
Handing stability and riding comfort have very big influence.The function of brake system of car is to ensure automobile short distance under steam
From the interior stability stopped and keep braking.Due to important function of the braking system in running car, so being directed to automobile
The design tool of the controller of braking system has very important significance.
At present, since commercial vehicle load is larger, to braking when demand braking force it is larger, so the braking system of commercial car
System mainly uses the form of air-pressure brake.Since traditional commercial car Pneumatic braking system exists, braking gas circuit is longer, brakes and builds
Pressure response is compared with the shortcomings of slow, control accuracy is relatively low.With the notable development of automobile electrically-controlled technology, commercial car line traffic control compressed air brake system
System is widely used with the advantages that its accurate pressure control, response quickly.Line traffic control Pneumatic braking system can not only meet tradition
The demand of air-pressure brake, and the accurate control to pressure can be realized by electric-control system, and by sensing system to system
The physical quantitys such as chamber pressure of taking offence are detected in real time, disclosure satisfy that the hardware requirement of current control technology, it is applied widely and
Stability is good.
Since the research of current commercial car line traffic control Pneumatic braking system is still at an early stage, to line traffic control Pneumatic braking system
The research of controller is still less, and the design of controller has extremely serious influence to whole line traffic control Pneumatic braking system,
The performance of line traffic control Pneumatic braking system controller also determines response time and the working performance of whole braking system.It is and existing at present
Control performance existing defects of some line traffic control Pneumatic braking system controllers to braking system, it is impossible to meet the fast run-up of braking system
Pressure, the braking requirement of accurate pressure control.
Utility model content
Lacked for the braking system construction in a systematic way pressure time is slow, control accuracy is low etc. in above-mentioned existing line traffic control Pneumatic braking system controller
Fall into, the utility model provides a kind of line traffic control Pneumatic braking system controller, to reach to the accurate of line traffic control Pneumatic braking system
Control.It is as follows with reference to Figure of description, the technical solution of the utility model：
Line traffic control Pneumatic braking system controller, by main control chip unit, operator brake signal gathering unit, pressure signal
Collecting unit, ABS solenoid-drivens unit, preceding bridge module driving unit and rear axle module driving unit composition；
Contain a microcontroller in the main control chip unit；
The signal output part of the operator brake signal gathering unit is connected with the signal input part of microcontroller, described to drive
The person's of sailing braking signal collection unit will be transmitted to after the built-in sensors signal conversion of master cylinder in line traffic control Pneumatic braking system
Microcontroller, to realize collection of the microcontroller to operator brake signal；
The signal output part of the pressure signal collecting unit is connected with the signal input part of microcontroller, the pressure signal
Collecting unit transmits the pressure signal that the pressure sensor on automobile four-wheel transmits out after precision resistance partial pressure
To microcontroller, to realize collection of the microcontroller to four-wheel pressure signal；
The signal input part of the ABS solenoid-drivens unit is connected with the signal output part of microcontroller, the ABS electromagnetism
After valve driving unit changes the control signal of microcontroller, independent voltage is exported to drive respectively in the ABS solenoid valves of Qian Qiao both sides
Valve core movement, so as to adjust the pressure of Qian Qiao both sides brake chamber respectively；
The signal input part of the preceding bridge module driving unit is connected with the signal output part of microcontroller, the preceding bridge module
After driving unit changes the control signal of microcontroller, output voltage is with the pressure charging valve in bridge module before driving and decompression valve actuation
Make, so as to be adjusted in synchronism the pressure of Qian Qiao both sides brake chamber.
The signal input part of the rear axle module driving unit is connected with the signal output part of microcontroller, the rear axle module
Driving unit will microcontroller control signal change after, output independent voltage with drive pressure charging valve in corresponding rear axle module and
Valve events are depressurized, so as to adjust the pressure of rear axle both sides brake chamber respectively.
Further, the main control chip unit further includes clock circuit, reset circuit and power circuit；
The clock circuit provides clock signal for microcontroller；
The reset circuit makes monolithic processor resetting, and then realizes system reset；
The power circuit is defeated for externally providing the high voltage that vehicle power supply is provided to low level after decompression is handled
Go out.
Further, in the pressure signal collecting unit, each road car wheel pressure signal is divided by two resistance
Pressure, one end and the input of wheel pressure signal of one of resistance R401 connect, and the other end is respectively with another resistance R402's
One end is connected with the pin of microcontroller collection corresponding pressure signal, the other end of another resistance R402 is connected with GND ends, described
Wheel pressure signal is carried out resistance series connection partial pressure by two resistance, to meet requirement of the one-chip machine port to peak.
Further, the operator brake signal gathering unit is by two resistance, a capacitance and a triode group
Into；
One end of one of resistance R501 is connected with the input of master cylinder pwm signal, the other end respectively with capacitance C501
One end, triode S501 base terminal connection, the other end of capacitance C501 and the emitter terminal of triode S501, GND ends connect
Connect, one end of another resistance R502 is connected with low level, the other end collector terminal and microcontroller with triode S501 respectively
Gather the pin connection of brake signal；
The highest voltage level that the low level is supported by microcontroller, to realize the ceiling voltage supported microcontroller
Pwm signal conversion.
Further, the ABS solenoid-drivens unit is by ABS solenoid-drivens chip and four ABS solenoid-drivens
Circuit forms；
Each ABS solenoid-drivens circuit is by two resistance, a triode and a diode composition；
One end of one of resistance R301 is connected with the pin that microcontroller output control corresponding A BS solenoid valves instruct, separately
One end is connected with the base terminal of triode S301, one end of another resistance R302 is defeated needed for ABS solenoid-driven chips
Enter level connection, the other end connects with the collector terminal of triode S301 and the input terminal pin of ABS solenoid-driven chips respectively
Connect, the output pins of ABS solenoid-driven chips is not turned on end and the driving of ABS electromagnetic valve bodies with diode D301 respectively
End connection, the emitter terminal of triode S301 and the conduction terminal of diode D301 are connected with GND ends respectively；
The signal of microcontroller output quilt under the on-off action of the triode in corresponding ABS solenoid-drivens circuit respectively
After conversion, ABS solenoid-driven chips are separately input into, and independent driving is outwards exported by ABS solenoid-drivens chip
Signal is to control the state of ABS solenoid valves.
Further, the preceding bridge module driving unit is by preceding bridge module driving chip and two preceding bridge module driver circuits
Composition；
Bridge module driver circuit is by two resistance, a triode and a diode composition before each；
The pin that bridge module inner valve body instructs before one end of one of resistance R101 is corresponding with microcontroller output control connects
Connect, the other end is connected with the base terminal of triode S101, needed for one end of another resistance R102 and preceding bridge module driving chip
Incoming level connection, the other end respectively with the collector terminal of triode S101 and the input terminal pin of preceding bridge module driving chip
Connection, the output pin of preceding bridge module driving chip are not turned on end and rear axle module inner valve body with diode D101 respectively
Drive end connects, and the emitter terminal of triode S101 and the conduction terminal of diode D101 are connected with GND ends respectively；
The signal of microcontroller output quilt under the on-off action of the triode in corresponding preceding bridge module driver circuit respectively
After conversion, bridge module driving chip before being separately input into, and by the preceding outside output drive signal of bridge module driving chip to control
The state of bridge module inner valve body before system.
Further, the rear axle module driving unit is by rear axle module driving chip and four rear axle module driver circuits
Composition；
Each rear axle module driver circuit is by two resistance, a triode and a diode composition；
The pin of one end rear axle module inner valve body instruction corresponding with microcontroller output control of one of resistance R201 connects
Connect, the other end is connected with the base terminal of triode S201, needed for one end of another resistance R202 and rear axle module driving chip
Incoming level connection, the other end respectively with the collector terminal of triode S201 and the input terminal pin of rear axle module driving chip
Connection, the output pin of rear axle module driving chip are not turned on end and rear axle module inner valve body with diode D201 respectively
Drive end connects, and the emitter terminal of triode S201 and the conduction terminal of diode D201 are connected with GND ends respectively；
The signal of microcontroller output quilt under the on-off action of the triode in corresponding rear axle module driver circuit respectively
After conversion, rear axle module driving chip is separately input into, and independent driving is outwards exported by rear axle module driving chip and is believed
Number to control the state of rear axle module inner valve body.
Compared with prior art, the beneficial effects of the utility model are：
1. a kind of line traffic control Pneumatic braking system controller described in the utility model and conventional gas brake system controller
Compare, by the way that each functional circuit of controller is integrated, its integrated level is higher, small volume, and function is more, disclosure satisfy that mesh
Preceding line traffic control Pneumatic braking system multi-signal collection, solenoid-driven etc. are more multi-functional.
2. a kind of line traffic control Pneumatic braking system controller described in the utility model and its control strategy are applicable at present
A variety of commercial car line traffic control Pneumatic braking systems, its versatility is preferable, applied widely, so prospect is preferable.
3. a kind of line traffic control Pneumatic braking system controller described in the utility model is due to by signal acquisition, control circuit etc.
Encapsulation integrates, and hardware platform can be used as to carry out the research and development of commercial car braking control strategy and verification, reduce research and development people
The research and development time of member and cost.
4. pass through circuit optimization, its reliability inside a kind of line traffic control Pneumatic braking system controller described in the utility model
Higher, interference free performance is preferable, can ensure the control accuracy and control stability of braking system.
5. a kind of electronic components such as line traffic control Pneumatic braking system controller inside chip described in the utility model use
Standard electronics at present, its cost is relatively low, and manufacturing process is simple, can be with large-scale application.
6. a kind of line traffic control Pneumatic braking system control strategy described in the utility model, its realize it is more convenient, and can be with
Reach higher control accuracy, line traffic control Pneumatic braking system can be made to realize fast run-up pressure, accurate pressure control.
Brief description of the drawings
Fig. 1 is the circuit structure schematic diagram of line traffic control Pneumatic braking system controller described in the utility model；
Fig. 2 is the single machine unit of the main control chip unit of line traffic control Pneumatic braking system controller described in the utility model
Circuit diagram；
Fig. 3 is that the reset circuit of the main control chip unit of line traffic control Pneumatic braking system controller described in the utility model is former
Reason figure；
Fig. 4 a are the first clock of the main control chip unit of line traffic control Pneumatic braking system controller described in the utility model
Circuit diagram；
Fig. 4 b are the second clock of the main control chip unit of line traffic control Pneumatic braking system controller described in the utility model
Circuit diagram；
Fig. 5 a are the first power supply of the main control chip unit of line traffic control Pneumatic braking system controller described in the utility model
Circuit diagram；
Fig. 5 b are the second source of the main control chip unit of line traffic control Pneumatic braking system controller described in the utility model
Circuit diagram；
Fig. 6 is that the circuit of the pressure signal collecting unit of line traffic control Pneumatic braking system controller described in the utility model is former
Reason figure；
Fig. 7 is the operator brake signal gathering unit of line traffic control Pneumatic braking system controller described in the utility model
Circuit diagram；
Fig. 8 is the circuit of the ABS solenoid-driven units of line traffic control Pneumatic braking system controller described in the utility model
Schematic diagram；
Fig. 9 is that the circuit of the preceding bridge module driving unit of line traffic control Pneumatic braking system controller described in the utility model is former
Reason figure；
Figure 10 is the circuit of the rear axle module driving unit of line traffic control Pneumatic braking system controller described in the utility model
Schematic diagram；
Figure 11 is the work flow diagram of line traffic control Pneumatic braking system controller described in the utility model；
In figure：
1. bridge module pressure charging valve drive end before, bridge module pressure reducing valve drive end before 2., pressure charging valve drives on the left of 3. rear axle modules
Moved end,
4. pressure reducing valve drive end on the left of rear axle module, 5. rear axle modules right side pressure charging valve drive end, 6. rear axle modules right side
Pressure reducing valve drive end,
71. left front ABS solenoid valves pressure charging valve drive end, 72. left front ABS solenoid valves pressure reducing valve drive ends, 73. left front ABS
Solenoid valve ground terminal,
81. ABS solenoid valves pressure charging valve drive end before the right side, ABS solenoid valve pressure reducing valve drive ends before 82. right sides, ABS before 83. right sides
Solenoid valve ground terminal.
Embodiment
For technical solution described in the utility model is expanded on further, with reference to Figure of description, the specific reality of the utility model
It is as follows to apply mode：
Line traffic control Pneumatic braking system controller described in the utility model includes main control chip unit, operator brake signal
Collecting unit, pressure signal collecting unit, ABS solenoid-drivens unit, preceding bridge module driving unit and rear axle module driving
Unit.
The main control chip unit includes single machine unit, clock circuit, reset circuit and power circuit.
The single machine unit is by microcontroller, capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5, capacitance C6, electricity
Hold C7, capacitance C8, capacitance C9, capacitance C10, capacitance C11 and capacitance C28 compositions.
The microcontroller uses the microcontroller of model STM32F103ZET6, which is ST Microelectronics
STM32F103ZET6 series monolithics are produced, its outside has 144 pins, its pin is specifically defined as shown in Figure 2.
VBAT pins, VDD_1 pins, VDD_2 pins, VDD_3 pins, VDD_4 pins, the VDD_5 of the microcontroller
Pin, VDD_6 pins, VDD_7 pins, VDD_8 pins, VDD_9 pins, VDD_10 pins, VDD_11 pins and power circuit
+ 3.3V the level provided is connected by electric wire.
VSS_1 pins, VSS_2 pins, VSS_3 pins, VSS_4 pins, VSS_5 pins, the VSS_6 of the microcontroller
Pin, VSS_7 pins, VSS_8 pins, VSS_9 pins, VSS_10 pins, VSS_11 pins are connected with GND by electric wire.
One end of capacitance C1 and the VDD_5 pins of microcontroller are connected by electric wire, the other end of capacitance C1 and microcontroller
VSS_5 pins are connected by electric wire；One end of capacitance C2 VDDA pins, VREF+ pins ,+3.3V level with microcontroller respectively
Connected by electric wire, the other end of capacitance C1 is connected with the VSSA pins, VREF- pins, GND of microcontroller by electric wire respectively；
One end of capacitance C3 and the VDD_4 pins of microcontroller are connected by electric wire, the other end of capacitance C3 and the VSS_4 pins of microcontroller
Connected by electric wire；One end of capacitance C4 and the VDD_6 pins of microcontroller are connected by electric wire, the other end and monolithic of capacitance C4
The VSS_6 pins of machine are connected by electric wire；One end of capacitance C5 and the VDD_7 pins of microcontroller are connected by electric wire, capacitance C5
The other end and the VSS_7 pins of microcontroller connected by electric wire；One end of capacitance C6 and the VDD_1 pins of microcontroller pass through electricity
Line connects, and the other end of capacitance C6 and the VSS_1 pins of microcontroller are connected by electric wire；One end of capacitance C7 and microcontroller
VDD_8 pins are connected by electric wire, and the other end of capacitance C7 and the VSS_8 pins of microcontroller are connected by electric wire；Capacitance C8's
The VDD_9 pins of one end and microcontroller are connected by electric wire, and the other end of capacitance C8 and the VSS_9 pins of microcontroller pass through electric wire
Connection；One end of capacitance C9 and the VDD_2 pins of microcontroller are connected by electric wire, the other end of capacitance C9 and the VSS_ of microcontroller
2 pins are connected by electric wire；One end of capacitance C10 and the VDD_10 pins of microcontroller are connected by electric wire, and capacitance C10's is another
End is connected with the VSS_10 pins of microcontroller by electric wire；One end of capacitance C11 and the VDD_11 pins of microcontroller pass through electric wire
Connection, the other end of capacitance C11 and the VSS_11 pins of microcontroller are connected by electric wire；One end of capacitance C28 and microcontroller
VDD_3 pins are connected by electric wire, and the other end of capacitance C28 and the VSS_3 pins of microcontroller are connected by electric wire.
The capacitance C1, capacitance C2, capacitance C3, capacitance C4, capacitance C5, capacitance C6, capacitance C7, capacitance C8, capacitance C9,
Capacitance C10, capacitance C11, capacitance C28 select the capacitance that capacitance is 100nF.
As shown in figure 3, the reset circuit is made of resistance R1, button RESET, capacitance C12.
The button RESET is a normally opened button, when pushing button RESET, the conducting of its both ends；Button RESET
One end with resistance R1, the NRST pins of microcontroller, one end of capacitance C12 are connected by electric wire respectively for one end；Button RESET
The other end of the other end respectively with GND, capacitance C12 be connected by electric wire；The other end of resistance R1 is connected with+3.3V level.
The capacitance C12 selects the capacitance that capacitance is 0.1 microfarad, and the resistance R1 selects the resistance that resistance value is 10k.
The reset circuit is act as：When system needs to reset, pushing button RESET draws the NRST of microcontroller
Foot is connected with GND ends, so that the NRST pins of microcontroller obtain low level, realizes monolithic processor resetting.
As shown in figure 4, the clock circuit includes the first clock circuit and second clock circuit；
First clock circuit is made of crystal oscillator Y1, capacitance C13, capacitance C14；The one of the crystal oscillator Y1
One end with capacitance C13, the OSC_IN pins of microcontroller are connected by electric wire respectively at end；The crystal oscillator Y1's is another
One end with capacitance C14, the OSC_OUT pins of microcontroller are connected by electric wire respectively at end；The other end of the capacitance C13 and
The other end of capacitance C14 is connected with GND ends.
Second clock circuit is made of crystal oscillator Y2, capacitance C15, capacitance C16；The one of the crystal oscillator Y2
One end with capacitance C15, the OSC32_IN pins of microcontroller are connected by electric wire respectively at end；The crystal oscillator Y2's is another
One end with capacitance C16, the OSC32_OUT pins of microcontroller are connected by electric wire respectively for one end；The capacitance C15's is another
The other end of end and capacitance C16 are connected with GND ends.
In above-mentioned clock circuit, the crystal oscillator Y1 selected frequencies are the crystal oscillator of 8MHz；The crystalline substance
Oscillation body device Y2 selected frequencies are the crystal oscillator of 32.768kHz；The capacitance C13 and capacitance C14 selects capacitance
For the capacitance of 20pF；The capacitance C15 and capacitance C16 selects the capacitance that capacitance is 10pF.
The effect of the clock circuit is to provide its required clock signal for microcontroller.
As shown in figure 5, the power circuit includes primary power source circuit and secondary power supply circuit；
The primary power source circuit by RT7272 chips, capacitance C17, capacitance C18, capacitance C19, capacitance C20, capacitance C21,
Capacitance C22, capacitance C23, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, diode D1 and inductance H1 compositions；It is described
RT7272 chips VIN pins one end with resistance R2, one end of capacitance C19, one end of capacitance C18, capacitance C17 respectively
One end is connected by electric wire；The EN pins of RT7272 chips are connected with the other end of resistance R2 by electric wire；RT7272 chips
RLIM pins are connected with one end of resistance R3 by electric wire；The GND pin of RT7272 the chips other end with resistance R3, electricity respectively
Hold the other end of C19, the other end of capacitance C18, the other end of capacitance C17 and GND to connect by electric wire；The RT7272
The BOOT pins of chip are connected with one end of capacitance C20 by electric wire；The SW pins of the RT7272 chips respectively with capacitance
The other end of C20, one end of inductance H1 are connected by electric wire；The other end of inductance H1 one end with resistance R5, capacitance C22 respectively
One end, one end of capacitance C23, the end that is not turned on of diode D1 pass through electric wire connection；The FB pins of the RT7272 chips
The other end with resistance R5, one end of resistance R6 are connected by electric wire respectively；The other end of resistance R6, the other end of capacitance C22,
The other end of capacitance C23, the conduction terminal of diode D1 are connected with GND ends respectively；The COMP pins of the RT7272 chips with
One end of capacitance C21 is connected by electric wire, and the other end of capacitance C21 is connected with one end of resistance R4 by electric wire, resistance R4's
The other end is connected with GND ends；Inputted by+24V the voltages that power supply on automobile is provided from the VIN pins of RT7272 chips；
The SW pins of RT7272 chips external offer+5V level terminals after inductance H1.
It by+24V the voltage conversions that power supply is provided on automobile is+5V voltages that the effect of the RT7272 chips, which is, with
Ensure the demand of pair+5V level of this controller other parts.
The secondary power supply circuit is by AMS1117-3.3 chips, polar capacitor C24, capacitance C25, polar capacitor C26 and electricity
Hold C27 compositions；The IN pins of the AMS1117-3.3 chips one end with capacitance C25, the cathode of polar capacitor C24 respectively
End is connected by electric wire；The other end with capacitance C25, polarity are electric respectively for the ADJ/GND pins of the AMS1117-3.3 chips
Hold the negative pole end of C24, GND ends are connected by electric wire；After two OUT pins connection of the AMS1117-3.3 chips respectively
Positive terminal, one end of capacitance C27 with polar capacitor C26 are connected by electric wire；The negative pole end of polar capacitor C26 and capacitance C27
The other end be connected with GND ends；IN pins by the+5V voltages that RT7272 chips are provided from AMS1117-3.3 chips are defeated
Enter；The OUT pins of AMS1117-3.3 chips externally provide+3.3V level terminals.
The effect of the AMS1117-3.3 chips is that+5V the voltage conversions for being provided RT7272 chips are+3.3V electricity
Pressure, to ensure the demand of the right+3.3V level of microcontroller in this controller.
In above-mentioned power circuit, the capacitance C17 selects the capacitance that capacitance is 0.1 microfarad；The capacitance C18 with
Capacitance C19 selects the capacitance that capacitance is 10 microfarads；The resistance R2 selects the resistance that resistance value is 100k；The electricity
Hinder the resistance that R3 selects resistance value to be 179k；The capacitance C20 selects the capacitance that capacitance is 0.1 microfarad；The capacitance
C21 selects the capacitance that capacitance is 2.7nF；The capacitance C22 and capacitance C23 selects the capacitance that capacitance is 10 microfarads；
The resistance R5 selects the resistance that resistance value is 62k；The resistance R6 selects the resistance that resistance value is 11.8k；Described
Resistance R4 selects the resistance that resistance value is 24k；The diode D1 selects the transient state of model SMAJ5.0CA to suppress two poles
Pipe.The polar capacitor C24 and C26 selects the polar capacitor that capacitance is 47 microfarads；The capacitance C25 and C27 is equal
Select the capacitance that capacitance is 0.1 microfarad.
The effect of the power circuit is the general+24V voltages for being provided vehicle power supply on automobile after decompression
External offer+5V and+3.3V level are exported, to ensure the demand of the right+5V of other parts and+3.3V level in this controller.
As shown in fig. 6, the pressure signal collecting unit is by resistance R401, resistance R402, resistance R403, resistance
R404, resistance R405, resistance R406, resistance R407, resistance R408 compositions.
One end of resistance R401 is connected with the input of the near front wheel pressure signal, the other end of resistance R401 respectively with resistance R402
One end, the PC0 pins of microcontroller connected by electric wire, the other end of resistance R402 is connected with GND ends；One end of resistance R403
Input and connect with off-front wheel pressure signal, the other end of resistance R403 one end with resistance R404, the PC1 pins of microcontroller respectively
Connected by electric wire, the other end of resistance R404 is connected with GND ends；One end of resistance R405 connects with the input of left rear wheel pressure signal
Connect, one end with resistance R406, the PC2 pins of microcontroller are connected the other end of resistance R405 by electric wire respectively, resistance R406
The other end be connected with GND ends；One end of resistance R407 is connected with the input of off hind wheel pressure signal, the other end point of resistance R407
The PC3 pins of one end, microcontroller not with resistance R408 are connected by electric wire, and the other end of resistance R408 is connected with GND ends.
The resistance R401, resistance R403, resistance R405, resistance R407 select the precision resistance that resistance value is 5k；
The resistance R402, resistance R404, resistance R406, resistance R408 select the precision resistance that resistance value is 10k.
The effect of the pressure signal collecting unit is to transmit out the pressure sensor on automobile four-wheel
Pressure signal is input in the pc port of microcontroller after precision resistance partial pressure, to realize that microcontroller believes four-wheel pressure
Number collection；The resistance R401, the function of resistance R402 are that the near front wheel pressure signal is carried out resistance series connection partial pressure, make it
Pressure signal is reduced to below+3.3V, to meet requirement of the single-chip processor i/o mouth to peak；The resistance R403, resistance
The function of R404 is that left rear wheel pressure signal is carried out resistance series connection partial pressure, its pressure signal is reduced to below+3.3V, with full
Requirement of the sufficient single-chip processor i/o mouth to peak；The resistance R405, the function of resistance R406 are by left rear wheel pressure signal
Resistance series connection partial pressure is carried out, its pressure signal is reduced to below+3.3V, to meet that single-chip processor i/o mouth wants peak
Ask；The resistance R407, the function of resistance R408 are that off hind wheel pressure signal is carried out resistance series connection partial pressure, believe its pressure
Number it is reduced to below+3.3V, to meet requirement of the single-chip processor i/o mouth to peak.
As shown in fig. 7, the operator brake signal gathering unit is by resistance R501, resistance R502, capacitance C501, three
Pole pipe S501 is formed.
One end of the resistance R501 is connected with the input of master cylinder pwm signal, the other end of resistance R501 respectively with
One end of capacitance C501, the base terminal of triode S501 are connected by electric wire, and the other end of capacitance C501 is with triode S501's
Emitter terminal, GND ends are connected by electric wire, and one end of resistance R502 is connected with+3.3V level, the other end difference of resistance R502
The PB3 pins of collector terminal, microcontroller with triode S501 are connected by electric wire.
The resistance R501 selects the resistance that resistance value is 10k, and resistance R502 selects the resistance that resistance value is 4.7k, electricity
Hold the capacitance that C501 selects capacitance to be 47pF, triode S501 selects the triode of model S8050, which is NPN
Type triode.
The effect of the operator brake signal gathering unit is by line traffic control Pneumatic braking system in master cylinder
The pwm signal that sensor signal is converted to+3.3V is put, since the microcontroller of this controller only supports that ceiling voltage is+3.3V's
Pwm signal inputs, and the output area of the sensor of collection driver pedal information is larger in master cylinder, passes through driver's system
The pwm signal conversion of dynamic signal gathering unit, could meet the requirement of microcontroller.When master cylinder exports high level signal
When, triode S501 is turned on, and the PB3 pins of microcontroller are connected since the conducting of triode is acted on GND ends at this time, and monolithic is machine-readable
Get low level signal；When master cylinder exports low level signal, triode S501 ends, at this time the PB3 pins of microcontroller
Directly it is connected by R502 with+3.3V level, microcontroller reads high level signal；Since master cylinder pwm signal is by driving
Pwm signal becomes for the pwm signal of reverse+3.3V after the person's of sailing braking signal collection unit, leads to during microcontroller control
The pwm signal read can be redefined by crossing software mode, to make up the problem of circuit is reverse.
As shown in figure 8, ABS solenoid-drivens unit by BTS724G chips, resistance R301, resistance R302, resistance R303,
Resistance R304, resistance R305, resistance R306, resistance R307, resistance R308, triode S301, triode S302, triode
S303, triode S304, diode D301, diode D302, diode D303, diode D304 compositions.
The ABS solenoid-drivens unit can drive the most of air-pressure brakes for the in the market that operating voltage is+24V
The ABS solenoid valves in field, the present embodiment is exemplified by driving two ABS solenoid valves that Wan An company produces, in each ABS solenoid valves
A pressure charging valve and a pressure reducing valve are put, is transported by four spools in BTS724G chip drives above-mentioned two ABS solenoid valves
It is dynamic.Two ABS solenoid valves are separately employed in the abs braking control of the near front wheel and off-front wheel, wherein left front ABS solenoid valves have
Three terminals are respectively left front ABS solenoid valves pressure charging valve drive end 71, left front ABS solenoid valves pressure reducing valve drive end 72 and left front
ABS solenoid valves ground terminal 73；It is respectively ABS solenoid valve pressure charging valve drive ends before the right side that ABS solenoid valves, which have three terminals, before the right side
81st, ABS solenoid valves ground terminal 83 before ABS solenoid valve pressure reducing valves drive end 82 and the right side before right.
The BTS724G chips are the power switch chip of company of Infineon production, it has 20 pins, Ke Yishi
The now driving output of most four passages, i.e., one piece of BTS724G chip can at most drive four valve core movements.
One end of resistance R301 and the PB7 pins of microcontroller are connected by electric wire, the other end and triode of resistance R301
The base terminal of S301 is connected by electric wire, and one end of resistance R302 is connected with+5V level by electric wire, the other end of resistance R302
The collector terminal with triode S301, the IN1 pins of BTS724G chips are connected by electric wire respectively；
One end of resistance R303 and the PB6 pins of microcontroller are connected by electric wire, the other end and triode of resistance R303
The base terminal of S302 is connected by electric wire, and one end of resistance R304 is connected with+5V level by electric wire, the other end of resistance R304
The collector terminal with triode S302, the IN2 pins of BTS724G chips are connected by electric wire respectively；
One end of resistance R305 and the PB5 pins of microcontroller are connected by electric wire, the other end and triode of resistance R305
The base terminal of S303 is connected by electric wire, and one end of resistance R306 is connected with+5V level by electric wire, the other end of resistance R306
The collector terminal with triode S303, the IN3 pins of BTS724G chips are connected by electric wire respectively；
One end of resistance R307 and the PB4 pins of microcontroller are connected by electric wire, the other end and triode of resistance R307
The base terminal of S304 is connected by electric wire, and one end of resistance R308 is connected with+5V level by electric wire, the other end of resistance R308
The collector terminal with triode S304, the IN4 pins of BTS724G chips are connected by electric wire respectively；
8 Vbb pins of BTS724G chips are connected with+24V level by electric wire, and the GND1/2 of BTS724G chips draws
Foot, GND3/4 pins are connected with GND ends by electric wire, the OUT1 pins of BTS724G chips respectively with diode D301 not
Conduction terminal, left front ABS solenoid valves pressure charging valve drive end 71 are connected by electric wire, and the OUT2 pins of BTS724G chips are respectively with two
Pole pipe D302 be not turned on end, left front ABS solenoid valves pressure reducing valve drive end 72 connected by electric wire, the OUT3 of BTS724G chips
Pin respectively with diode D303 be not turned on end, it is right before ABS solenoid valve pressure charging valves drive end 81 be connected by electric wire,
The OUT4 pins of BTS724G chips respectively with diode D304 be not turned on end, it is right before ABS solenoid valve pressure charging valves drive end 82 it is logical
Electric wire connection is crossed, ABS solenoid valves ground terminal 83 is connected with GND ends before left front ABS solenoid valves ground terminal 73 and the right side；Triode
The emitter terminal of S301, the emitter terminal of triode S302, the emitter of the emitter terminal of triode S303 and triode S304
End is connected with GND ends by electric wire；The conduction terminal of diode D301, the conduction terminal of diode D302, diode D303 are led
Go side, the conduction terminal of diode D304 are connected with GND ends by electric wire.
The resistance R301, resistance R303, resistance R305, resistance R307 select the resistance of 10k；The resistance
R302, resistance R304, resistance R306, resistance R308 select the resistance of 4.7k；The triode S301, triode S302,
Triode S303, triode S304 select the triode of model S8050；The diode D301, diode D302, two
Pole pipe D303, diode D304 select the diode of model S1J.
The effect of the ABS solenoid-driven units is to pass through four tunnel control signals of microcontroller PB3-PB7 pins
The on-off action of triode, is converted to the control signal of+5V to meet that the incoming level of BTST24G chips will by control signal
Ask, and be input in four passages of BTS724G chips ,+24V the voltages of the external four tunnel independences of output of BTS724G chips are to drive
Left front ABS solenoid valves and four spool self-movements in ABS solenoid valves before the right side are moved, to realize the shape to two ABS solenoid valves
State controls.
As shown in figure 9, preceding bridge module driving unit is by BTS724G chips, resistance R101, resistance R102, resistance R103, electricity
Hinder R104, triode S101, triode S102, diode D101, diode D102 compositions.
The preceding bridge module driving unit can drive the preceding bridge mould that the WABCO companies that operating voltage is+24V produce
Block, the present embodiment have a pressure charging valve by taking bridge module before driving the third generation that WABCO companies produce as an example in the preceding bridge module
And a pressure reducing valve, the preceding bridge module pressure charging valve drive end 1 before only needing to connect in the control of this controller in bridge module is with before
Bridge module pressure reducing valve drive end 2, to realize the control to preceding bridge module.
One end of resistance R101 and the PB12 pins of microcontroller are connected by electric wire, the other end and triode of resistance R101
The base terminal of S101 is connected by electric wire, and one end of resistance R102 is connected with+5V level by electric wire, the other end of resistance R102
The collector terminal with triode S101, the IN1 pins of BTS724G chips are connected by electric wire respectively,
One end of resistance R103 and the PB13 pins of microcontroller are connected by electric wire, the other end and triode of resistance R103
The base terminal of S102 is connected by electric wire, and one end of resistance R104 is connected with+5V level by electric wire, the other end of resistance R104
The collector terminal with triode S102, the IN2 pins of BTS724G chips are connected by electric wire respectively,
8 Vbb pins of BTS724G chips are connected with+24V level by electric wire, and the GND1/2 of BTS724G chips draws
Foot, GND3/4 pins are connected with GND ends by electric wire, the OUT1 pins of BTS724G chips respectively with diode D101 not
Conduction terminal, preceding bridge module pressure charging valve drive end 1 are connected by electric wire, the OUT2 pins of BTS724G chips respectively with diode
D102 be not turned on end, preceding bridge module pressure reducing valve drive end 2 connected by electric wire, the emitter and triode of triode S101
The emitter of S102 is connected with GND ends by electric wire；The conduction terminal of diode D101, the conduction terminal of diode D102 with
GND ends are connected by electric wire.
Resistance R101, the resistance R103 selects the resistance of 10k；Resistance R102, the resistance R104 is selected
The resistance of 4.7k；Triode S101, the triode S102 selects the triode of model S8050；The diode
D101, diode D102 select the diode of model S1J.
The effect of the preceding bridge module driving unit is to pass through the two path control signal of microcontroller PB12 and PB13 pin
The on-off action of triode is crossed, control signal is converted into the control signal of+5V to meet that the incoming level of BTST24G chips will
Ask, and be input in the first two passage of BTS724G chips, BTS724G chips externally export the+24V voltages of two-way independence with
Pressure charging valve and pressure reducing valve before driving in bridge module carry out self-movement, to realize that the state to preceding bridge module controls.
As shown in Figure 10, rear axle module driving unit by BTS724G chips, resistance R201, resistance R202, resistance R203,
Resistance R204, resistance R205, resistance R206, resistance R207, resistance R208, triode S201, triode S202, triode
S203, triode S204, diode D201, diode D202, diode D203, diode D204 compositions.
The rear axle module driving unit can drive the rear axle mould that the WABCO companies that operating voltage is+24V produce
Block, the present embodiment each side have exemplified by driving the third generation rear axle module that WABCO companies produce in the rear axle module
One pressure charging valve and a pressure reducing valve, sharing four solenoid valves needs to control, and only needs to connect rear axle in the control of this controller
Pressure charging valve drive end 3 on the left of rear axle module in module, rear axle module left side pressure reducing valve drive end 4, the supercharging of rear axle module right side
Valve drive end 5, rear axle module right side pressure reducing valve drive end 6, to realize the control to rear axle module.
One end of resistance R201 and the PB11 pins of microcontroller are connected by electric wire, the other end and triode of resistance R201
The base terminal of S201 is connected by electric wire, and one end of resistance R202 is connected with+5V level by electric wire, the other end of resistance R202
The collector terminal with triode S201, the IN1 pins of BTS724G chips are connected by electric wire respectively；
One end of resistance R203 and the PB10 pins of microcontroller are connected by electric wire, the other end and triode of resistance R203
The base terminal of S302 is connected by electric wire, and one end of resistance R204 is connected with+5V level by electric wire, the other end of resistance R204
The collector terminal with triode S202, the IN2 pins of BTS724G chips are connected by electric wire respectively；
One end of resistance R205 and the PB9 pins of microcontroller are connected by electric wire, the other end and triode of resistance R205
The base terminal of S203 is connected by electric wire, and one end of resistance R206 is connected with+5V level by electric wire, the other end of resistance R206
The collector terminal with triode S203, the IN3 pins of BTS724G chips are connected by electric wire respectively；
One end of resistance R207 and the PB8 pins of microcontroller are connected by electric wire, the other end and triode of resistance R207
The base terminal of S204 is connected by electric wire, and one end of resistance R208 is connected with+5V level by electric wire, the other end of resistance R208
The collector terminal with triode S204, the IN4 pins of BTS724G chips are connected by electric wire respectively；
8 Vbb pins of BTS724G chips are connected with+24V level by electric wire, and the GND1/2 of BTS724G chips draws
Foot, GND3/4 pins are connected with GND ends by electric wire, the OUT1 pins of BTS724G chips respectively with diode D201 not
Conduction terminal, pressure charging valve drive end 3 is connected by electric wire on the left of rear axle module, the OUT2 pins of BTS724G chips respectively with two poles
Pipe D202 be not turned on end, pressure reducing valve drive end 4 is connected by electric wire on the left of rear axle module, the OUT3 pins of BTS724G chips
Respectively with diode D203 be not turned on end, pressure charging valve drive end 5 is connected by electric wire on the right side of rear axle module, BTS724G chips
OUT4 pins respectively with diode D204 be not turned on end, pressure reducing valve drive end 6 is connected by electric wire on the right side of rear axle module, three
The emitter of pole pipe S201, the emitter of triode S202, the emitter of the emitter of triode S203 and triode S204 are equal
It is connected with GND ends by electric wire；The conduction terminal of diode D201, the conduction terminal of diode D202, the conduction terminal of diode D203,
The conduction terminal of diode D204 is connected with GND ends by electric wire.
The resistance R201, resistance R203, resistance R205, resistance R207 select the resistance of 10k；The resistance
R202, resistance R204, resistance R206, resistance R208 select the resistance of 4.7k；The triode S201, triode S202,
Triode S203, triode S204 select the triode of model S8050；The diode D201, diode D202, two
Pole pipe D203, diode D204 select the diode of model S1J.
The effect of the rear axle module driving unit is to pass through four tunnel control signals of microcontroller PB8-PB11 pins
The on-off action of triode, is converted to the control signal of+5V to meet that the incoming level of BTST24G chips will by control signal
Ask, and be input in four passages of BTS724G chips, BTS724G chips externally export the+24V voltage signals of four tunnel independences
To drive, totally four solenoid valves carry out self-movement at left and right sides of rear axle module, to realize to the only of the both sides state of rear axle module
Vertical control.
The course of work of line traffic control Pneumatic braking system controller described in the utility model is using double logic threshold methods, tool
Body process is as follows：
It is mutually independent since the pressure of four brake chambers corresponding to automobile four-wheel is adjusted, therefore, in braking procedure
Pressure adjust can be divided into " two brake chamber goal pressure of front axle is identical ", " two brake chamber goal pressure of front axle different " and
" two brake chamber goal pressure of rear axle is separately adjustable " three kinds of situations:
(1) two brake chamber goal pressure of front axle is identical：
Central vehicle ECU can calculate the target pressure reached required for current two wheel braking gas chambers of braking system front axle
Force value, and the single machine unit being transmitted in line traffic control Pneumatic braking system controller.Single machine unit passes through pressure at the same time
Signal gathering unit collects the actual pressure value of two wheel braking gas chamber of front axle.Single machine unit is according to the target pressure value
Four independent threshold values are set, and are controlled process subdivision to be pressurized, protect for Quick-pressurizing, slowly by four threshold values
Segmentation increase and decrease pressure is taken in pressure, slowly decompression and five processes of fast decompression, the different thresholding sections according to where actual pressure value
Control method, at this time, bridge module driving unit sends corresponding control signal to single machine unit forward, and bridge module driving is single before making
First output pwm signal is controlled the pressure charging valve in preceding bridge module and the open and-shut mode of pressure reducing valve, realizes to preceding two wheel of bridge
The pressure of brake chamber is carried out at the same time adjusting, and the duty cycle of pwm signal changes and becomes with goal pressure and the difference of actual pressure
Change, so that system reaches higher control accuracy with the shorter response time.
(2) two brake chamber goal pressure of front axle is different：
Central vehicle ECU can be calculated in current braking system, the target pressure reached required for single front wheel brake gas chamber
Force value, and the single machine unit being transmitted in line traffic control Pneumatic braking system controller.Single machine unit passes through pressure at the same time
Signal gathering unit collects the actual pressure value of the wheel braking gas chamber.Single machine unit sets four according to the target pressure value
A independent threshold value, and by four threshold values controlled process subdivision for Quick-pressurizing, slowly supercharging, pressurize, slow
Decompression and five processes of fast decompression, the different thresholding sections according to where actual pressure value take segmentation to increase Decompression Controlling side
Method, at this time microcontroller send corresponding control signal to ABS solenoid-drivens unit, ABS solenoid-drivens unit is exported PWM
Signal is controlled the pressure charging valve in the front-wheel side ABS solenoid valves and the open and-shut mode of pressure reducing valve, the duty cycle of pwm signal
Change with goal pressure and the change of the difference of actual pressure, so that system reaches higher control essence with the shorter response time
Degree.Since above-mentioned ABS solenoid-drivens unit at the same time respectively can carry out solely ABS solenoid valves before left front ABS solenoid valves and the right side
Vertical PWM controls, it is possible to it is separately adjustable to realize that the pressure that brake chamber is corresponded to two wheel of front axle carries out.
(3) two brake chamber goal pressure of rear axle is separately adjustable：
Central vehicle ECU can be calculated in current braking system, the target pressure reached required for single rear service brake gas chamber
Force value, and the single machine unit being transmitted in line traffic control Pneumatic braking system controller.Single machine unit passes through pressure at the same time
Signal gathering unit collects the actual pressure value of the wheel braking gas chamber.Single machine unit sets four according to the target pressure value
A independent threshold value, and by four threshold values controlled process subdivision for Quick-pressurizing, slowly supercharging, pressurize, slow
Decompression and five processes of fast decompression, the different thresholding sections according to where actual pressure value take segmentation to increase Decompression Controlling side
Method, at this time microcontroller send corresponding control signal to rear axle module driving unit, make rear axle module driving unit output PWM letters
Number the pressure charging valve of the trailing wheel side in rear axle module and the open and-shut mode of pressure reducing valve are controlled, the duty cycle of pwm signal with
Goal pressure and the difference of actual pressure change and change, so that system reaches higher control essence with the shorter response time
Degree.Since above-mentioned rear axle module driving unit at the same time can carry out solely the pressure charging valve of the left and right sides in rear axle module and pressure reducing valve
Vertical PWM controls, it is possible to it is separately adjustable to realize that the pressure that brake chamber is corresponded to two wheel of rear axle carries out.
It is as follows that the segmentation increases decompression control method：
When actual pressure is less than goal pressure, into pressurization stages, at this moment pressurization is divided into Quick-pressurizing and slowly
Two states are pressurized, when actual pressure is much smaller than goal pressure, into the Quick-pressurizing stage, at this moment single machine unit is to preceding bridge
Module drive unit/ABS solenoid-drivens unit/rear axle module driving unit sends control signal, driving unit output
The pwm signal of 100% duty cycle opens corresponding pressure charging valve energization in preceding bridge module/ABS solenoid valves/rear axle module, decompression
Valve power-off is closed, and actual pressure rises rapidly, at this moment single into slow pressurization stages when actual pressure rises to certain value
Piece machine unit sends control signal to preceding bridge module driving unit/ABS solenoid-drivens unit/rear axle module driving unit, should
The pwm signal that driving unit exports certain duty cycle leads to the corresponding pressure charging valve in preceding bridge module/ABS solenoid valves/rear axle module
Electricity is opened, and pressure reducing valve power-off is closed, and actual pressure continues slowly to rise, and enters when actual pressure relatively goal pressure and protects
The pressure stage.
When actual pressure is more than goal pressure, into decompression phase, at this moment decompression process is also classified into fast decompression and eases up
Slow decompression two states, when actual pressure is much larger than goal pressure, into the fast decompression stage, at this moment single machine unit is to preceding
Bridge module driving unit/ABS solenoid-drivens unit/rear axle module driving unit sends control signal, driving unit output
The pwm signal of 100% duty cycle opens the corresponding pressure reducing valve energization in preceding bridge module/ABS solenoid valves/rear axle module, supercharging
Valve power-off is closed, and actual pressure declines rapidly, at this moment single into slow decompression phase when actual pressure drops to certain value
Piece machine unit sends control signal to preceding bridge module driving unit/ABS solenoid-drivens unit/rear axle module driving unit, should
The pwm signal that driving unit exports certain duty cycle leads to the corresponding pressure reducing valve in preceding bridge module/ABS solenoid valves/rear axle module
Electricity is opened, and pressure charging valve power-off is closed, and actual pressure continues slowly to decline, and enters when actual pressure relatively goal pressure and protects
The pressure stage.
When certain a small range around actual pressure is located at goal pressure, into packing stage, at this moment single machine unit
Control signal, the driving unit are sent to preceding bridge module driving unit/ABS solenoid-drivens unit/rear axle module driving unit
The pwm signal that external output duty cycle is 0%, makes the pressure charging valve and pressure reducing valve in preceding bridge module/ABS solenoid valves/rear axle module
Power-off is closed, and remains unchanged brake pressure.
As shown in figure 11, p1 is the dutyfactor value of corresponding supercharging valve control signal, and p2 is corresponding decompression valve control signal
Dutyfactor value, with reference to Figure of description, above-mentioned line traffic control Pneumatic braking system control method idiographic flow is as follows:
The goal pressure Pt reached needed for a certain wheel braking gas chamber is obtained from central vehicle ECU by single machine unit,
And the actual pressure Pa of the brake chamber is collected by pressure signal collecting unit；This control strategy setting four is independent to patrol
It is respectively 1-s1,1-s2,1+s2 and 1+s3, wherein s1 to collect threshold value>S2, s3>S2, and s1, s2, s3 are normal less than 1
Number, the concrete numerical value of s1, s2, s3 can be configured according to the actual conditions of line traffic control baric systerm, in the hope of obtaining highest control
Performance；
Compare Pa and (1-s2) * Pt numerical value first, as actual pressure Pa≤(1-s2) * Pt, at this time the brake chamber into
Enter pressurization stages, at this moment pressurization is divided into Quick-pressurizing and slowly supercharging two states.Compare Pa and (1-s1) * Pt numbers afterwards
Value：As actual pressure Pa≤(1-s1) * Pt, illustrate that its actual pressure value is much smaller than target pressure value, which enters
In the Quick-pressurizing stage, at this moment single machine unit is to corresponding driving unit transmission control signal, and the driving unit is to corresponding increasing
The pwm signal that pressure valve exports 100% duty cycle makes its opening that is powered, and the pwm signal of 0% duty cycle is exported to corresponding pressure reducing valve
Close its power-off, so that the pressure in brake chamber is lifted rapidly；
As (1-s1) * Pt<During Pa≤(1-s2) * Pt, illustrate that its actual pressure value is slightly less than target pressure value, the braking gas
Room enters slow pressurization stages, and at this moment single machine unit sends control signal to corresponding driving unit, and the driving unit is to phase
The pwm signal of pressure charging valve output f1 (Pa/Pt) duty cycle answered makes its opening that is powered, and 0% duty is exported to corresponding pressure reducing valve
The pwm signal of ratio closes its power-off, so that the pressure in brake chamber steadily gradually rises, improves pressure controling precision；Its
Middle f1 (Pa/Pt) is pressure charging valve change in duty cycle function, it is the function of the ratio between actual pressure and target pressure value Pa/Pt.
As actual pressure Pa>During (1-s2) * Pt, illustrate that actual pressure Pa is more than the required threshold value of supercharging at this time, than
Compared with Pa and (1+s2) * Pt numerical value, as actual pressure Pa<During (1+s2) * Pt, illustrate that actual pressure Pa is wanted again smaller than decompression at this time
The threshold value asked, pressure meets dwell condition in the brake chamber, and at this moment single machine unit sends corresponding driving unit and controls
Signal processed, the pwm signal which exports corresponding pressure charging valve and pressure reducing valve 0% duty cycle make the two power off at the same time
Close, brake chamber realizes pressurize.
As actual pressure Pa >=(1+s2) * Pt, the brake chamber enters decompression phase at this time, and at this moment decompression process is divided into
Fast decompression and slowly decompression two states.Compare Pa and (1+s3) * Pt numerical value afterwards：As actual pressure Pa >=(1+s3) * Pt
When, illustrate that its actual pressure value is much larger than target pressure value, which enters the fast decompression stage, at this moment single machine unit
Control signal is sent to corresponding driving unit, which exports corresponding pressure reducing valve the pwm signal of 100% duty cycle
Make it be powered to open, exporting corresponding pressure charging valve the pwm signal of 0% duty cycle closes its power-off, so that in brake chamber
Rapid pressure drop；
As (1+s2) * Pt≤Pa<During (1+s3) * Pt, illustrate that its actual pressure value is slightly larger than target pressure value, the braking gas
Room enters slow decompression phase, and at this moment single machine unit sends control signal to corresponding driving unit, and the driving unit is to phase
The pwm signal of pressure reducing valve output f2 (Pa/Pt) duty cycle answered makes its opening that is powered, and 0% duty is exported to corresponding pressure charging valve
The pwm signal of ratio closes its power-off, so that the pressure in brake chamber steadily progressively declines, improves pressure controling precision；Its
Middle f2 (Pa/Pt) is pressure reducing valve change in duty cycle function, it is the function of the ratio between actual pressure and target pressure value Pa/Pt.
Claims (7)
1. line traffic control Pneumatic braking system controller, it is characterised in that：
By main control chip unit, operator brake signal gathering unit, pressure signal collecting unit, ABS solenoid-drivens unit,
Preceding bridge module driving unit and rear axle module driving unit composition；
Contain a microcontroller in the main control chip unit；
The signal output part of the operator brake signal gathering unit is connected with the signal input part of microcontroller, the driver
Braking signal collection unit will be transmitted to monolithic after the built-in sensors signal conversion of master cylinder in line traffic control Pneumatic braking system
Machine, to realize collection of the microcontroller to operator brake signal；
The signal output part of the pressure signal collecting unit is connected with the signal input part of microcontroller, the pressure signal collection
The pressure signal that pressure sensor on automobile four-wheel transmits out is transmitted to list by unit after precision resistance partial pressure
Piece machine, to realize collection of the microcontroller to four-wheel pressure signal；
The signal input part of the ABS solenoid-drivens unit is connected with the signal output part of microcontroller, and the ABS solenoid valves drive
After moving cell changes the control signal of microcontroller, independent voltage is exported to drive the valve in the ABS solenoid valves of Qian Qiao both sides respectively
Core moves, so as to adjust the pressure of Qian Qiao both sides brake chamber respectively；
The signal input part of the preceding bridge module driving unit is connected with the signal output part of microcontroller, the preceding bridge module driving
After unit changes the control signal of microcontroller, output voltage with the pressure charging valve and decompression valve events in bridge module before driving, from
And the pressure of Qian Qiao both sides brake chamber is adjusted in synchronism,
The signal input part of the rear axle module driving unit is connected with the signal output part of microcontroller, the rear axle module driving
After unit changes the control signal of microcontroller, independent voltage is exported to drive pressure charging valve and the decompression in corresponding rear axle module
Valve events, so as to adjust the pressure of rear axle both sides brake chamber respectively.
2. line traffic control Pneumatic braking system controller as claimed in claim 1, it is characterised in that：
The main control chip unit further includes clock circuit, reset circuit and power circuit；
The clock circuit provides clock signal for microcontroller；
The reset circuit makes monolithic processor resetting, and then realizes system reset；
The power circuit is used to externally provide the high voltage that vehicle power supply is provided to low level output after decompression is handled.
3. line traffic control Pneumatic braking system controller as claimed in claim 1, it is characterised in that：
In the pressure signal collecting unit, each road car wheel pressure signal carries out partial pressure, one of electricity by two resistance
The one end and the input of wheel pressure signal for hindering R401 connect, and the other end is adopted with one end of another resistance R402 and microcontroller respectively
The pin connection of the corresponding pressure signal of collection, the other end of another resistance R402 are connected with GND ends, and described two resistance are by wheel
Pressure signal carries out resistance series connection partial pressure, to meet requirement of the one-chip machine port to peak.
4. line traffic control Pneumatic braking system controller as claimed in claim 1, it is characterised in that：
The operator brake signal gathering unit is made of two resistance, a capacitance and a triode；
One end of one of resistance R501 is connected with the input of master cylinder pwm signal, the other end respectively with capacitance C501 one
End, the base terminal connection of triode S501, the other end of capacitance C501 are connected with the emitter terminal of triode S501, GND ends, separately
One end of one resistance R502 is connected with low level, and the other end gathers with the collector terminal and microcontroller of triode S501 make respectively
The pin connection of dynamic signal；
The highest voltage level that the low level is supported by microcontroller, to realize the ceiling voltage supported microcontroller
Pwm signal is changed.
5. line traffic control Pneumatic braking system controller as claimed in claim 1, it is characterised in that：
The ABS solenoid-drivens unit is made of ABS solenoid-drivens chip and four ABS solenoid-driven circuits；
Each ABS solenoid-drivens circuit is by two resistance, a triode and a diode composition；
One end of one of resistance R301 is connected with the pin that microcontroller output control corresponding A BS solenoid valves instruct, the other end
It is connected with the base terminal of triode S301, one end of another resistance R302 and the input electricity needed for ABS solenoid-driven chips
Flushconnection, the other end are connected with the collector terminal of triode S301 and the input terminal pin of ABS solenoid-driven chips respectively,
The output pin of ABS solenoid-driven chips respectively with diode D301 be not turned on end and ABS electromagnetic valve body drive ends
Connection, the emitter terminal of triode S301 and the conduction terminal of diode D301 are connected with GND ends respectively；
The signal of microcontroller output is changed under the on-off action of the triode in corresponding ABS solenoid-drivens circuit respectively
Afterwards, ABS solenoid-driven chips are separately input into, and independent drive signal is outwards exported by ABS solenoid-drivens chip
To control the state of ABS solenoid valves.
6. line traffic control Pneumatic braking system controller as claimed in claim 1, it is characterised in that：
The preceding bridge module driving unit is made of preceding bridge module driving chip and two preceding bridge module driver circuits；
Bridge module driver circuit is by two resistance, a triode and a diode composition before each；
The pin connection that bridge module inner valve body instructs before one end of one of resistance R101 is corresponding with microcontroller output control, separately
One end is connected with the base terminal of triode S101, one end of another resistance R102 and the input needed for preceding bridge module driving chip
Level connects, and the other end is connected with the collector terminal of triode S101 and the input terminal pin of preceding bridge module driving chip respectively,
The driving for being not turned on end and rear axle module inner valve body with diode D101 respectively of the output pin of preceding bridge module driving chip
End connection, the emitter terminal of triode S101 and the conduction terminal of diode D101 are connected with GND ends respectively；
The signal of microcontroller output is changed under the on-off action of the triode in corresponding preceding bridge module driver circuit respectively
Afterwards, bridge module driving chip before being separately input into, and by the preceding outside output drive signal of bridge module driving chip to control before
The state of bridge module inner valve body.
7. line traffic control Pneumatic braking system controller as claimed in claim 1, it is characterised in that：
The rear axle module driving unit is made of rear axle module driving chip and four rear axle module driver circuits；
Each rear axle module driver circuit is by two resistance, a triode and a diode composition；
The pin connection of one end rear axle module inner valve body instruction corresponding with microcontroller output control of one of resistance R201, separately
One end is connected with the base terminal of triode S201, one end and the input needed for rear axle module driving chip of another resistance R202
Level connects, and the other end is connected with the collector terminal of triode S201 and the input terminal pin of rear axle module driving chip respectively,
The driving for being not turned on end and rear axle module inner valve body with diode D201 respectively of the output pin of rear axle module driving chip
End connection, the emitter terminal of triode S201 and the conduction terminal of diode D201 are connected with GND ends respectively；
The signal of microcontroller output is changed under the on-off action of the triode in corresponding rear axle module driver circuit respectively
Afterwards, be separately input into rear axle module driving chip, and by rear axle module driving chip outwards export independent drive signal with
Control the state of rear axle module inner valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721333405.2U CN207311404U (en) | 2017-10-17 | 2017-10-17 | Line traffic control Pneumatic braking system controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721333405.2U CN207311404U (en) | 2017-10-17 | 2017-10-17 | Line traffic control Pneumatic braking system controller |
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| CN107618490A (en) * | 2017-10-17 | 2018-01-23 | 吉林大学 | Line traffic control Pneumatic braking system controller and its control method |
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| CN107618490A (en) * | 2017-10-17 | 2018-01-23 | 吉林大学 | Line traffic control Pneumatic braking system controller and its control method |
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