CN102632882B - Electronic air pressure parking braking system of automated mechanical type gear box vehicle and braking method - Google Patents
Electronic air pressure parking braking system of automated mechanical type gear box vehicle and braking method Download PDFInfo
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Abstract
The invention relates to an electronic air pressure parking braking system of an automated mechanical type gear box vehicle, belonging to the technical field of braking control of a passenger car. The system comprises an air compressor, an air dryer, a pressure regulating valve, a front air storage cylinder, a back air storage cylinder, a parking emergency braking air storage cylinder, a braking pedal, a double-cavity braking valve, a quick release valve, a manual braking valve, left and right front-wheel braking air chambers, left and right back-wheel braking air chambers, a first one-way valve, a second one-way valve, a first ABS (Anti-skid Brake System) solenoid valve, a second ABS solenoid valve, a third ABS solenoid valve, a fourth ABS solenoid valve, a plurality of three-way joints and a controller. The electronic air pressure parking braking system is characterized in that: compared with the traditional air pressure braking system, the system is additionally provided with the first one-way valve, the first ABS solenoid valve and the controller for electronic parking braking. The system is used for solving the problem that a passenger car or a commercial car which utilizes an automated mechanical transmission (AMT) slips off a slope due to interrupted power in a starting and gear-shifting process, and solving the parking and starting slope-slipping problem of frequently starting and stopping a public transport vehicle.
Description
Technical field
The invention belongs to passenger vehicle Brake Control field, particularly a kind of smart electronics air pressure Parking auxiliary braking system formed by means of electronic control unit.
Background technology
Along with the development of auto trade and the raising day by day of people's living standard, the brake safe performance of automobile is subject to people's attention gradually.For service braking system, excessive to intelligent, safe ABS (anti-lock braking system in automobiles) system gradually by original general braking.For emergency brake system (even vehicle is parked in the resident motionless brake system in original place (comprising on the slope)), be also the same, also at the mechanical rod-pulling type emergency brake system by originally, to electronic brake system (Electrical Park Brake, be abbreviated as EPB), develop gradually.
Traditional emergency brake system generally has brake-applying handle, middle device (common vehicle mostly is drag-line, for air brakes vehicles, mostly is pneumatic circuit, rapid release valve and compressed air brake cylinder) and drg to form.While taking to brake, need chaufeur to provide certain pulling force by the brake-applying handle pull-up, pulling force chaufeur provided by drag-line passes to drg or connects pneumatic circuit and rapid release valve opened the gas of compressed air brake cylinder is discharged and taked braking (during the logical high pressure gas of air pressure emergency brake system, braking is in disarm state, carry out braking during pressure release normal pressure), make vehicle be parked in original place resident motionless.The locking button that needs chaufeur to press brake-applying handle during brake off is put back to original position by brake-applying handle can brake off.This system is carried out effort, complicated operation, and does not have uphill starting anti-slip slope design.Use extremely inconvenience for the bus driver of frequent start-stop.
Electronic brake system has a kind of control method to be improved by the structure to brake-applying handle, below the braking during standstill chuck, adds electronic control package, by original emergency brake system, realizes Parking and uphill starting control.This system architecture is complicated, element making accuracy requirement is high, cost is comparatively expensive and be only applicable to the mechanical type parking brake system.Be unfavorable for being promoted on passenger vehicle, manned vehicle.Another kind of control method is to realize on the basis of air pressure abs braking system.The method is delivered to the air pressure transmission that prestores in air receiver in the compressed air brake cylinder of each wheel by controlling initiatively tonifying Qi electromagnetic valve, realizes braking during standstill.According to each vehicle wheel rotation situation of vehicle, take corresponding control policy, utilize the pressure maintaining effect of ABS solenoid regulated valve, several times the air pressure of being controlled in each wheel braking air chamber of vehicle is progressively discharged, thus brake off.The method is more intense to the dependency of ABS system, controls complexity, realizes that difficulty is large.And this control method replaced the braking of original manual parking fully and control, allow and want that the automotive hobbyist of playing drift can only admire and can not experience.
AMT (Automated Mechanical Transmission) automatic mechanical type change speed gear box vehicle refers to take hand-operated transmission as parent, and the disengaging of clutch of hand-operated transmission and selector fork etc. are realized automatically handling by the parts of human control.The traditional air pressure emergency brake system of the general employing of such car brakeing emergency brake system, can only realize and remove braking during standstill by chaufeur pulling brake-applying handle, can not realize that the intellectuality of its braking during standstill is controlled.For driving experience, be not very abundant chaufeur, such vehicle is easy to while shifting gears in ramp the slope phenomenon occur slipping due to power interruption.Bring inconvenience to the driving procedure of chaufeur, greatly reduce driver's Driving.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, designed a kind of for AMT automatic mechanical type change speed gear box vehicle electric air pressure emergency brake system and braking method (Electronic Air Park Brake System, be abbreviated as EAPBS).Be mainly used in solve adopting the passenger vehicle, commercial vehicle/comm..vehicle of AMT automatic mechanical transmission in the uphill starting gearshift procedure, the slope problem of slipping caused due to power interruption, and the Parking in public transit vehicle frequent start-stop process, anti-slip slope problem starts to walk.
It is a kind of for automatic mechanical type change speed gear box vehicle AMT electronics air pressure emergency brake system that the present invention proposes, and this system comprises air compressor, air dryer, pressure regulating valve, front air receiver, rear air receiver, Parking emergency brake air receiver, brake pedal, dual-chamber brake, rapid release valve, hand brake valve, left and right front wheel brake air chamber, left and right trailing wheel compressed air brake cylinder, the second check valve, the two the 3 4th ABS electromagnetic valve and a plurality of T-pipe joints; It is characterized in that, this system also comprises the first check valve, an ABS electromagnetic valve and for the controller of electronic brake; Between each parts, annexation is:
The air compressor mouth is connected with the input end of air dryer, and the mouth of air dryer is connected with pressure regulating valve, and the input end that the mouth of this pressure regulating valve connects respectively forward and backward air receiver forms two branch roads; Wherein,
The first branch road is: the mouth of front air receiver connects respectively the input end of an ABS electromagnetic valve and the input end of dual-chamber brake ante-chamber by a threeway, the mouth of dual-chamber brake ante-chamber connects the first check valve, the mouth of the one ABS electromagnetic valve is with together with the mouth of the first check valve converges to, then with the input end of the 2nd ABS electromagnetic valve, with the input end of the 3rd ABS electromagnetic valve, is connected respectively by a threeway; The mouth of the mouth of the 2nd ABS electromagnetic valve and the 3rd ABS electromagnetic valve does not part on the left side and is connected with off front wheel compressed air brake cylinder admission port with the near front wheel compressed air brake cylinder admission port;
The second branch road is: the mouth of rear air receiver is connected with the second check valve input end with the input end of dual-chamber brake back cavity respectively by a threeway, and the second check valve mouth is connected with the input end of Parking emergency brake air receiver; The mouth of dual-chamber brake back cavity is connected with the 4th ABS electromagnetic valve input end; The mouth of the 4th ABS electromagnetic valve is connected with the front compressed air brake cylinder of left rear wheel and the front compressed air brake cylinder of off hind wheel respectively by a threeway; The mouth of Parking emergency brake air receiver is connected with the input end of the moving brake activation valve of catcher with the input end of rapid release valve respectively by a threeway, the mouth of hand brake valve is connected with the control end of rapid release valve, and the mouth of rapid release valve is received respectively the rear compressed air brake cylinder of left rear wheel and the rear compressed air brake cylinder of off hind wheel by a threeway;
The one ABS electromagnetic valve also is connected with controller by wire, and controller is connected with the CAN bus of vehicle, obtains wheel speed signal, speed-slackening signal, acceleration pedal signal and AMT gear signal; Controller is judged according to incoming signal and pre-stored control program therein, corresponding control command is passed to an ABS electromagnetic valve, thereby realize supercharging, pressurize and the decompression of brake system.
The present invention also proposes a kind of brake control method that adopts above-mentioned electronics air pressure emergency brake system, it is characterized in that, the method comprises the following steps:
Step 1) is when vehicle launch, and this electronics air pressure emergency brake system carries out system reset, program initialization; Now an ABS electromagnetic valve is connected brake piping and atmosphere, and an ABS electromagnetic valve is in the pressure release state;
Step 2) judge whether chaufeur has the braking intention: according to the CAN bus, carry the speed-slackening signal of coming to judge whether chaufeur steps on brake pedal.If brake pedal is operated, controller sends the pressurize instruction to an ABS electromagnetic valve, make electromagnetic valve switch to packing state, gas, by dual-chamber brake ante-chamber, the first check valve, the two or three ABS electromagnetic valve, enters respectively the near front wheel compressed air brake cylinder and off front wheel compressed air brake cylinder and takes braking; If brake pedal be not operated or step on by after be released, enter step 3);
Step 3) judges that vehicle is whether in halted state: the rotation situation of carrying the wheel speed signal judgement drive wheel of coming according to the CAN bus: if the drive wheel wheel speed is not 0, vehicle place state of kinematic motion, go to step 5); If the drive wheel wheel speed is 0, controller sends the pressurize instruction to an ABS electromagnetic valve, make this ABS electromagnetic valve in packing state, until carry the Acceleration Signal of coming to judge the chaufeur bend the throttle, there is the intention of driving by the CAN bus, go to step 4);
Step 4) judges whether vehicle exists and slips the slope phenomenon: carry the gear signal of the wheel speed signal of coming, AMT change speed gear box and obtain acceleration signal by speed signal by calculus of differences according to the CAN bus jointly to be judged, concrete judgement is as follows:
(4-1) when the drive wheel wheel speed is greater than zero, if gear in D Drive D, and the acceleration/accel of drive wheel is greater than zero, goes to step 5); If gear be not in D Drive D or gear in forward gear D and the drive wheel acceleration/accel is not more than zero (illustrate that automobile storage slipping the slope phenomenon), controller sends the supercharging instruction to an ABS electromagnetic valve, sends subsequently the pressurize instruction again, goes to step 3);
(4-2), when the drive wheel wheel speed is not more than zero, if gear in reverse gear R, and the acceleration/accel of drive wheel is greater than zero, goes to step 5); If gear be not in reverse gear R or gear in reverse gear R and the drive wheel acceleration/accel is not more than zero, controller sends the supercharging instruction to an ABS electromagnetic valve, sends subsequently the pressurize instruction again, goes to step 3);
The step 5) controller sends the pressure release instruction to an ABS electromagnetic valve, and this electromagnetic valve is in pressure release state, brake off; Go to step afterwards 1) system reset, program initialization; So constantly circulation, control with the intellectuality that realizes automatic mechanical type change speed gear box vehicle electric air pressure braking during standstill.
Characteristics of the present invention and control effect:
Added an ABS electromagnetic valve and a check valve on structure of the present invention on the basis of original brake system, it is simple in structure, cost of investment is low.Have independently controller in control, separate on this controller and original ABS system architecture, and can reach on function, coordinate to control, its intelligent degree is high, result of use good, can solve the slope problem of slipping that AMT (Automated Mechanical Transmission) automatic mechanical type change speed gear box passenger vehicle, commercial vehicle/comm..vehicle cause due to power interruption in the uphill starting gearshift procedure, and Parking in public transit vehicle frequent start-stop process, anti-slip slope problem starts to walk.
The accompanying drawing explanation
Fig. 1 is electronics air pressure emergency brake system structural representation of the present invention;
Fig. 2 is electronics air pressure emergency brake system controller block diagram of the present invention;
The braking during standstill control flow chart that Fig. 3 is native system.
The specific embodiment
Automatic mechanical type change speed gear box vehicle electric air pressure emergency brake system and control method that the present invention proposes reach by reference to the accompanying drawings embodiment and are described in detail as follows:
The electronics air pressure emergency brake system structure of automatic mechanical type change speed gear box vehicle of the present invention as shown in Figure 1, this system constituent elements comprises: air compressor, air dryer, pressure regulating valve, front air receiver, rear air receiver, Parking emergency brake air receiver, brake pedal, dual-chamber brake, rapid release valve, the hand brake valve, left and right front-wheel (FL, FR) compressed air brake cylinder (FL, the FR air chamber), left and right trailing wheel (RL, RR) compressed air brake cylinder (RL, the RR air chamber), two check valves (add when wherein the first check valve is system improvement of the present invention, the second check valve is that original Pneumatic braking system carries), four ABS electromagnetic valves (add when wherein an ABS electromagnetic valve is system improvement of the present invention, second, the 3rd, the 4th ABS electromagnetic valve is that original Pneumatic braking system carries), a plurality of T-pipe joints and controller and pre-stored braking during standstill control program therein (this controller is also that system of the present invention is added while improving).
Only have in the said system element that to participate in an auxiliary ABS electromagnetic valve, the first check valve and the controller of controlling be that the present invention adds for the improved system function, miscellaneous part all when vehicle designs the designer match.For an ABS electromagnetic valve and the first check valve correlation parameter choose, according to designing requirement and the particular case of vehicle, selected.
Between this various parts, annexation is as follows:
The input end of air compressor output termination air dryer, output termination one pressure regulating valve of air dryer, after pressure regulating valve, pipeline is divided into two, and the input end that connects respectively forward and backward air receiver forms two branch roads.
The first branch road: the mouth of front air receiver connects respectively the input end of an ABS electromagnetic valve and the input end of dual-chamber brake ante-chamber by a threeway, output termination first check valve of dual-chamber brake ante-chamber, the mouth of an ABS electromagnetic valve is with together with the mouth of the first check valve converges to by a threeway again, receives respectively more afterwards the input end of the 3rd ABS electromagnetic valve of the input end of the 2nd ABS electromagnetic valve that is connected to the near front wheel (FL) compressed air brake cylinder (FL air chamber) admission port and off front wheel (FR) compressed air brake cylinder (FR air chamber) admission port by a threeway.
The second branch road: the mouth of rear air receiver is received respectively the input end of dual-chamber brake back cavity by a threeway and is connected to the input end of Parking emergency brake air receiver by the second check valve; The mouth of dual-chamber brake back cavity is divided into two after receiving the 4th ABS electromagnetic valve input end, receives respectively the front compressed air brake cylinder (air chamber before RL) of left rear wheel (RL) and the front compressed air brake cylinder (air chamber before RR) of off hind wheel (RR); The mouth of Parking emergency brake air receiver connects respectively the input end of rapid release valve and the input end of the moving brake activation valve (being arranged under brake-applying handle) of catcher by a threeway, the mouth of hand brake valve is received on the control end of rapid release valve, and the mouth of rapid release valve is received respectively the rear compressed air brake cylinder (RL rear gas chamber) of left rear wheel (RL) and the rear compressed air brake cylinder (RR rear gas chamber) of off hind wheel (RR) by a threeway.
With upper pipeline, connect, in the first branch road in the past the air receiver mouth be connected three lead to an ABS electromagnetic valve and belong to the present invention to the brake piping improvement part to the threeway part of the first check valve mouth and the first check valve of dual-chamber brake ante-chamber mouth serial connection again.Remainder is the original brake line of vehicle.The electromagnetic control part of wherein controlling an ABS electromagnetic valve of auxiliary braking is connected with controller by wire, and controller is connected with original CAN bus of vehicle, obtains wheel speed signal, speed-slackening signal, acceleration pedal signal and AMT gear signal; Controller is judged that according to the various signals of input a backward ABS electromagnetic valve sends supercharging, pressurize, decompression instruction, the electromagnetic control of the one ABS electromagnetic valve partly acts accordingly, control the auxiliary braking pipeline and connect, end, connect atmosphere, thereby realize the control of electronics air pressure braking during standstill.
The ABS electromagnetic valve adopted in system of the present invention has three mode of operations.(1) when an ABS electromagnetic valve input/output terminal is connected, this electromagnetic valve is in pressurized state; (2) when an ABS electromagnetic valve input/output terminal cut-off, this electromagnetic valve is in packing state; (3) when an ABS electromagnetic valve input end cut-off mouth and atmosphere connection, this electromagnetic valve is in decompression state (or being called the pressure release state).Wherein participate under an ABS electromagnetic valve normality of electronics air pressure emergency brake system of the present invention in the pressure release state, former be useful on that ABS controls second, third, under the 4th ABS electromagnetic valve normality in the conducting pressurized state.
Controller of the present invention is judged according to incoming signal and the control program stored in micro controller system in advance, then corresponding control command is passed to the electromagnetic control unit of an ABS electromagnetic valve, thereby realize supercharging, pressurize and the decompression of auxiliary braking system.When system, during in initial condition, system reset, an ABS electromagnetic valve is in the pressure release state, to guarantee that vehicle can normally travel.For dual-chamber brake, when chaufeur is stepped on brake pedal, the main brake pipeline is connected, and high pressure gas are arrived the compressed air brake cylinder of each wheel through dual-chamber brake by air compressor, take braking.When chaufeur releasing brake pedal, before and after dual-chamber brake, the input end in chamber is all in off condition, and mouth and atmosphere are connected, thereby the high pressure gas of each wheel braking air chamber are discharged in air, brake off.This is also the reason of the present invention at dual-chamber brake ante-chamber output termination one check valve.Because only in this way, when brake pedal is stepped in chaufeur release, the break-make of front brake circuit just can be controlled by an ABS electromagnetic valve.Could realize the electronic and intelligentized type control of emergency brake system.
Controller architecture of the present invention as shown in Figure 2, because the control process of native system only need be to CAN bus (Controller Area Network, controller local area network, on automobile, use now the most general a kind of data bus) gear signal of carrying wheel speed signal, speed-slackening signal, acceleration pedal signal and the AMT change speed gear box of coming in addition analyzing and processing get final product, therefore on employing market the most common single chip computer AT 89S52 as the key control unit of this system.The native system controller mainly reaches by power module, clock module, CAN interface, reset circuit, interrupt request, AT89S52 micro controller system the braking during standstill control program, serial ports output, D/A conversion, the amplifying circuit that embed in advance wherein and forms.Wherein power module is used for providing the voltage of normal operation to micro controller system; Clock module is used for providing clock pulse to micro controller system, in order to counting and timing; The data that the CAN interface is used for the CAN bus is provided are read in micro controller system, for control program provides required data; Reset circuit is in order to power on or the reset mode of reseting procedure control single chip computer; Interrupt request breaks down in order to system or extraneous request while interrupting, and makes micro controller system jump to the mode of operation of setting; Single chip computer AT 89S52 is the key control unit of this system, is responsible for the processing of input message, the judgement of program, the transmission work of output command; Serial ports output is used for the control command of micro controller system is sent to external device from micro controller system; The effect that the D/A dress changes is that the digital signal that micro controller system is transmitted out is converted to analog signal (mostly being voltage signal), in order to an ABS electromagnetic valve is controlled; The amplifying circuit function is that the analog signal that D/A is converted to is amplified, in order to make output voltage reach the control voltage of an ABS electromagnetism.
Its brake control method is: the gear signal of the wheel speed signal on the automobile CAN communication bus, speed-slackening signal, acceleration pedal signal and AMT change speed gear box is extracted, send in real time the controller of electronics air pressure emergency brake system to.Controller is judged the residing state of kinematic motion of vehicle according to these signals, to an ABS electromagnetic valve, sends control command, controls the break-make of auxiliary braking pipeline, to realize and to remove auxiliary braking during standstill.Used acceleration signal in the method deterministic process, and do not had acceleration signal in the middle of the signal that the CAN communication bus sends, therefore, before being judged, controller need to carry out calculus of differences to speed signal, to obtain acceleration signal.
The braking during standstill of this controller is controlled the specific implementation flow process as shown in Figure 3, comprises the following steps:
Step 1) when vehicle launch, this electronics air pressure emergency brake system system reset, program initialization; Now an ABS electromagnetic valve is connected brake piping and atmosphere, and an ABS electromagnetic valve is in the pressure release state;
Step 2) judge whether chaufeur has the braking intention: according to the CAN bus, carry the speed-slackening signal of coming to judge whether chaufeur steps on brake pedal.If brake pedal is operated, controller sends the pressurize instruction to an ABS electromagnetic valve, make electromagnetic valve switch to packing state, gas, by dual-chamber brake ante-chamber, the first check valve, the two or three ABS electromagnetic valve, enters respectively the near front wheel (FL) compressed air brake cylinder (FL air chamber) and off front wheel (FR) compressed air brake cylinder (FR air chamber) and takes braking; If brake pedal be not operated or step on by after be released, enter step 3);
Step 3) judges that vehicle is whether in halted state: the rotation situation of carrying the wheel speed signal judgement drive wheel of coming according to the CAN bus: if the drive wheel wheel speed is not 0, vehicle place state of kinematic motion, go to step 5); If the drive wheel wheel speed is that 0(explanation vehicle is in halted state), controller sends the pressurize instruction to an ABS electromagnetic valve, make this ABS electromagnetic valve in packing state, until carry the Acceleration Signal of coming to judge the chaufeur bend the throttle, there is the intention of driving by the CAN bus, go to step 4);
Step 4) judges whether vehicle exists and slips the slope phenomenon: carry the gear signal of the wheel speed signal of coming, AMT change speed gear box and obtain acceleration signal by speed signal by calculus of differences according to the CAN bus jointly to be judged, concrete judgement is as follows:
(4-1) when the drive wheel wheel speed is greater than zero, if gear in D Drive D, and the acceleration/accel of drive wheel is greater than zero (illustrate that propulsive effort is greater than brake resistance and vehicle gravity along oblique prone component, vehicle not there will be slip the slope phenomenon), goes to step 5); If gear is not in forward gear D and the drive wheel acceleration/accel is not more than zero (illustrate that automobile storage slipping the slope phenomenon) in D Drive D or gear, controller sends the supercharging instruction to an ABS electromagnetic valve, send again subsequently pressurize instruction (single supercharging and dwell time need to obtain through debugging according to the vehicle situation), go to step 3);
(4-2), when the drive wheel wheel speed is not more than zero, if gear in reverse gear R, and the acceleration/accel of drive wheel is greater than zero (illustrate that propulsive effort is greater than brake resistance and vehicle gravity along oblique prone component, vehicle not there will be slip the slope phenomenon), goes to step 5); If gear is not in reverse gear R and the drive wheel acceleration/accel is not more than zero (illustrate that automobile storage slipping the slope phenomenon) in reverse gear R or gear, controller sends the supercharging instruction to an ABS electromagnetic valve, send again subsequently pressurize instruction (single supercharging and dwell time need to obtain through debugging according to the vehicle situation), go to step 3);
The step 5) controller sends the pressure release instruction to an ABS electromagnetic valve, and this electromagnetic valve is in pressure release state (the concrete pressure release time need to be sought and get a reasonable value through debugging), brake off; Go to step afterwards 1) system reset, program initialization; So constantly circulation, control with the intellectuality that realizes AMT (Automated Mechanical Transmission) automatic mechanical type change speed gear box vehicle electric air pressure braking during standstill.
Below in conjunction with the electronics air pressure emergency brake system control flow chart of the electronics air pressure emergency brake system structure of Fig. 1 and Fig. 3 to vehicle under different operating modes, gas flow is illustrated.
When chaufeur is stepped on brake pedal, the one ABS electromagnetic valve is initially located in two ends cut-off, packing state, now dual-chamber brake is connected brake piping, front-wheel gas flow: air compressor → air dryer → pressure regulating valve → front air receiver → dual-chamber brake ante-chamber → first check valve → the two or three ABS electromagnetic valve → left and right front wheel brake air chamber (FL, FR air chamber).
When chaufeur releasing brake pedal, if vehicle does not stop, illustrate that braking to be in order slowing down but not to need Parking in earlier stage, now an ABS electromagnetic valve is connected rear end pipeline and atmosphere, the pressure release brake off.Front-wheel gas flow: left and right front wheel brake air chamber (FL, FR air chamber) → the two or three ABS electromagnetic valve → ABS electromagnetic valve → atmosphere.If vehicle has stopped getting off, an ABS electromagnetic valve is always in the cut-off packing state, and the high pressure gas of supply can't be discharged when chaufeur is stepped on brake pedal before, and front-wheel is always in braking mode.This operating mode is in order to solve the anti-slip slope of the Parking problem in public transit vehicle frequent start-stop process.
Following operating mode is for solving the passenger vehicle that adopts the AMT automatic mechanical transmission, commercial vehicle/comm..vehicle at the uphill starting gearshift procedure, the slope problem of slipping caused due to power interruption.
When needs are started to walk, the chaufeur stepping on accelerator pedal.If the driving wheel of vehicle wheel speed is greater than zero, in conjunction with gear stages, judge whether vehicle slips slope.If gear is in D Drive D, and the acceleration/accel of drive wheel is greater than zero, illustrates that propulsive effort is greater than brake resistance, and vehicle not there will be and slips the slope phenomenon.Now an ABS electromagnetic valve is carried out pressure release instruction, brake off.Front-wheel gas flow: left and right front wheel brake air chamber (FL, FR air chamber) → the two or three ABS electromagnetic valve → ABS electromagnetic valve → atmosphere; If gear be not in forward gear D or gear in forward gear D and the drive wheel acceleration/accel is not more than zero, illustrate that automobile storage slipping the slope phenomenon.Now an ABS electromagnetic valve is carried out the supercharging instruction, carries out afterwards pressurize instruction (increase dwell time obtain through debugging according to the vehicle situation), and then drives intention to judge.Front-wheel gas flow: air compressor → air dryer → pressure regulating valve → front air receiver → ABS electromagnetic valve → the two or three ABS electromagnetic valve → left and right front wheel brake air chamber (FL, FR air chamber).
Equally, if the driving wheel of vehicle wheel speed is not more than zero, also to judge whether vehicle slips slope in conjunction with gear.If gear is in reverse gear R, and the acceleration/accel of drive wheel is greater than zero, illustrates that propulsive effort is greater than brake resistance, and vehicle not there will be and slips the slope phenomenon.Now an ABS electromagnetic valve is carried out pressure release instruction, brake off.Front-wheel gas flow: left and right front wheel brake air chamber (FL, FR air chamber) → the two or three ABS electromagnetic valve the one ABS electromagnetic valve → atmosphere; If gear is not to be not more than zero in reverse gear R or gear in reverse gear R and drive wheel acceleration/accel, illustrate that automobile storage slipping the slope phenomenon.Now electromagnetic valve is carried out the pressurization instruction, carries out afterwards pressurize instruction (increase dwell time obtain through debugging according to the vehicle situation), and then drives intention to judge.Front-wheel gas flow: air compressor → air dryer → pressure regulating valve → front air receiver → ABS electromagnetic valve → the two or three ABS electromagnetic valve → left and right front wheel brake air chamber (FL, FR air chamber).
Claims (1)
1. the brake control method for automatic mechanical type change speed gear box vehicle AMT electronics air pressure emergency brake system, this system comprises air compressor, air dryer, pressure regulating valve, front air receiver, rear air receiver, Parking emergency brake air receiver, brake pedal, dual-chamber brake, rapid release valve, hand brake valve, left and right front wheel brake air chamber, left and right trailing wheel compressed air brake cylinder, the second check valve, the two the 3 4th ABS electromagnetic valve and a plurality of T-pipe joints; This system also comprises the first check valve, an ABS electromagnetic valve and for the controller of electronic brake; Between described each parts, annexation is:
The air compressor mouth is connected with the input end of air dryer, and the mouth of air dryer is connected with pressure regulating valve, and the input end that the mouth of this pressure regulating valve connects respectively forward and backward air receiver forms two branch roads; Wherein,
The first branch road is: the mouth of front air receiver connects respectively the input end of an ABS electromagnetic valve and the input end of dual-chamber brake ante-chamber by a threeway, the mouth of dual-chamber brake ante-chamber connects the first check valve, the mouth of the one ABS electromagnetic valve is with together with the mouth of the first check valve converges to, then with the input end of the 2nd ABS electromagnetic valve, with the input end of the 3rd ABS electromagnetic valve, is connected respectively by a threeway; The mouth of the mouth of the 2nd ABS electromagnetic valve and the 3rd ABS electromagnetic valve is connected with off front wheel compressed air brake cylinder admission port with the near front wheel compressed air brake cylinder admission port respectively;
The second branch road is: the mouth of rear air receiver is connected with the second check valve input end with the input end of dual-chamber brake back cavity respectively by a threeway, and the second check valve mouth is connected with the input end of Parking emergency brake air receiver; The mouth of dual-chamber brake back cavity is connected with the 4th ABS electromagnetic valve input end; The mouth of the 4th ABS electromagnetic valve is connected with the front compressed air brake cylinder of left rear wheel and the front compressed air brake cylinder of off hind wheel respectively by a threeway; The mouth of Parking emergency brake air receiver is connected with the input end of hand brake valve with the input end of rapid release valve respectively by a threeway, the mouth of hand brake valve is connected with the control end of rapid release valve, and the mouth of rapid release valve is received respectively the rear compressed air brake cylinder of left rear wheel and the rear compressed air brake cylinder of off hind wheel by a threeway;
The one ABS electromagnetic valve also is connected with controller by wire, and controller is connected with the CAN bus of vehicle, obtains wheel speed signal, speed-slackening signal, acceleration pedal signal and AMT gear signal; Controller is judged according to incoming signal and pre-stored control program therein, corresponding control command is passed to an ABS electromagnetic valve, thereby realize supercharging, pressurize and the decompression of brake system; It is characterized in that, the method comprises the following steps:
Step 1) is when vehicle launch, and this electronics air pressure emergency brake system carries out system reset, program initialization; Now an ABS electromagnetic valve is connected brake piping and atmosphere, and an ABS electromagnetic valve is in the pressure release state;
Step 2) judge whether chaufeur has the braking intention: according to the CAN bus, carry the speed-slackening signal of coming to judge whether chaufeur steps on brake pedal, if brake pedal is operated, controller sends the pressurize instruction to an ABS electromagnetic valve, make electromagnetic valve switch to packing state, gas, by dual-chamber brake ante-chamber, the first check valve, the two or three ABS electromagnetic valve, enters respectively the near front wheel compressed air brake cylinder and off front wheel compressed air brake cylinder and takes braking; If brake pedal be not operated or step on by after be released, enter step 3);
Step 3) judges that vehicle is whether in halted state: the rotation situation of carrying the wheel speed signal judgement drive wheel of coming according to the CAN bus: if the drive wheel wheel speed is not 0, vehicle is kept in motion, and goes to step 5); If the drive wheel wheel speed is 0, controller sends the pressurize instruction to an ABS electromagnetic valve, make this ABS electromagnetic valve in packing state, until carry the Acceleration Signal of coming to judge the chaufeur bend the throttle, there is the intention of driving by the CAN bus, go to step 4);
Step 4) judges whether vehicle exists and slips the slope phenomenon: carry the gear signal of the wheel speed signal of coming, AMT change speed gear box and obtain acceleration signal by speed signal by calculus of differences according to the CAN bus jointly to be judged, concrete judgement is as follows:
(4-1) when the drive wheel wheel speed is greater than zero, if gear in D Drive D, and the acceleration/accel of drive wheel is greater than zero, goes to step 5); If gear be not in D Drive D or gear in forward gear D and the drive wheel acceleration/accel is not more than zero, illustrate that automobile storage slipping the slope phenomenon, controller sends the supercharging instruction to an ABS electromagnetic valve, sends subsequently the pressurize instruction again, goes to step 3);
(4-2), when the drive wheel wheel speed is not more than zero, if gear in reverse gear R, and the acceleration/accel of drive wheel is greater than zero, goes to step 5); If gear be not in reverse gear R or gear in reverse gear R and the drive wheel acceleration/accel is not more than zero, controller sends the supercharging instruction to an ABS electromagnetic valve, sends subsequently the pressurize instruction again, goes to step 3);
The step 5) controller sends the pressure release instruction to an ABS electromagnetic valve, and this electromagnetic valve is in pressure release state, brake off; Go to step afterwards 1) system reset, program initialization; So constantly circulation, control with the intellectuality that realizes automatic mechanical type change speed gear box vehicle electric air pressure braking during standstill.
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| CN103171540A (en) * | 2013-02-26 | 2013-06-26 | 广西昊罡机械有限公司 | Air brake system of tractor |
| DE102014002817B4 (en) * | 2014-02-26 | 2024-05-08 | Audi Ag | Method and device for actuating a braking device of a drive train of a vehicle having an automatic transmission, in particular of a motor vehicle |
| CN104608755B (en) * | 2015-01-30 | 2017-02-15 | 河南护航实业股份有限公司 | Van electric control air brake device |
| CN107914689B (en) * | 2017-11-08 | 2020-04-21 | 湖北航天技术研究院特种车辆技术中心 | Parking braking system |
| CN108032804A (en) * | 2017-12-08 | 2018-05-15 | 风度（常州）汽车研发院有限公司 | Car slipping based reminding method and device |
| CN108422989A (en) * | 2018-04-28 | 2018-08-21 | 瑞立集团瑞安汽车零部件有限公司 | The commercial automobile-used air braking system of new energy |
| CN108928335B (en) * | 2018-07-16 | 2023-08-15 | 一汽解放汽车有限公司 | Automatic braking system for unmanned vehicle |
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| CN111477062B (en) * | 2020-04-24 | 2024-06-25 | 浙江众合护航科技有限公司 | Air brake AEBS simulation platform for commercial vehicle for teaching and research |
| CN112648359A (en) * | 2020-12-08 | 2021-04-13 | 人马（江苏）智能科技有限公司 | Commercial vehicle AMT slope slipping prevention control system based on electronic brake assistance |
| CN112622910B (en) * | 2021-01-04 | 2022-06-07 | 一汽解放汽车有限公司 | Commercial vehicle temporary stop control system, control method, equipment and storage medium |
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Application publication date: 20120815 Assignee: TIANJIN SOTEREA AUTOMOTIVE TECHNOLOGY Co.,Ltd. Assignor: TSINGHUA University Contract record no.: X2020990000173 Denomination of invention: Electronic air pressure parking braking system of automated mechanical type gear box vehicle and braking method Granted publication date: 20131211 License type: Common License Record date: 20200413 |
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