CN102632882A - 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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- CN102632882A CN102632882A CN2012101357708A CN201210135770A CN102632882A CN 102632882 A CN102632882 A CN 102632882A CN 2012101357708 A CN2012101357708 A CN 2012101357708A CN 201210135770 A CN201210135770 A CN 201210135770A CN 102632882 A CN102632882 A CN 102632882A
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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 control of braking technical field, particularly a kind of smart electronics air pressure Parking auxiliary braking system by means of the electronic control unit composition.
Background technology
Along with the continuous development of auto trade and the raising day by day of people's living standard, the brake safe performance of automobile receives 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)) also is the same; Also developing to electronic brake system (Electrical Park Brake is abbreviated as EPB) gradually by originally mechanical rod-pulling type emergency brake system.
Traditional emergency brake system generally has brake-applying handle, middle device (mostly common vehicle is drag-line, is mostly pneumatic circuit, rapid release valve and compressed air brake cylinder for air brakes vehicles) and drg to form.Take glancing impact to need chaufeur to provide certain pulling force with the brake-applying handle pull-up; The pulling force that chaufeur is provided through drag-line passes to drg or connects pneumatic circuit and rapid release valve opened the gas of compressed air brake cylinder discharged and taked braking (braking is in disarm state during the logical high pressure gas of air pressure emergency brake system; Carry out braking during pressure release normal pressure), it is resident motionless to make vehicle be parked in the original place.Then needing chaufeur to press the locking button of brake-applying handle during brake off can brake off with the brake-applying handle replaced.This system carries out effort, complicated operation, and does not have the anti-slide of uphill starting slope design.For the bus driver of frequent start-stop, use extremely inconvenience.
It is to improve through the structure to brake-applying handle that electronic brake system has a kind of control method, below the braking during standstill chuck, adds electronic control package, realizes Parking and uphill starting control through original emergency brake system.This system architecture is complicated, element making accuracy requirement is high, cost is comparatively expensive and only be applicable to the mechanical type emergency brake system.Be unfavorable on passenger vehicle, manned vehicle, promoting.Another kind of control method is on the basis of air pressure abs braking system, to realize.This method is delivered to the air pressure that prestores in the air receiver in the compressed air brake cylinder of each wheel through control active tonifying Qi electromagnetic valve, realizes braking during standstill.According to each wheel situation of vehicle, take cooresponding control policy, utilize the pressurize effect of ABS solenoid regulated valve, several times the air pressure in each wheel braking air chamber of Be Controlled vehicle is progressively discharged, thus brake off.This method is more intense to the dependency of ABS system, and control is complicated, the realization difficulty is big.And this control method replaced original manual parking control of braking fully, lets 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 is meant with the hand-operated transmission to be parent, leans on the parts of human control to realize automatic guidance the disengaging of clutch of hand-operated transmission and selector fork etc.Such car brakeing emergency brake system is general to adopt traditional air pressure emergency brake system, can only draw through chaufeur to put brake-applying handle and realize and remove braking during standstill, can not realize the intellectuality control of its braking during standstill.For driving experience is not very abundant chaufeur, and such vehicle is easy to when shifting gears in the ramp sloping phenomenon occur slipping owing to power interruption.Bring inconvenience for the driving procedure of chaufeur, greatly reduce driver's driving enjoyment.
Summary of the invention
The objective of the invention is for overcoming the weak point of prior art, designed a kind of AMT of being used for automatic mechanical type change speed gear box vehicle electric air pressure emergency brake system and braking method (Electronic Air Park Brake System is abbreviated as EAPBS).Be mainly used in the passenger vehicle that solve to adopt the AMT automatic mechanical transmission, commercial vehicle/comm..vehicle in the uphill starting gearshift procedure, because the slide that power interruption causes slope problem, and the Parking in the public transit vehicle frequent start-stop process, starting are anti-slips sloping problem.
A kind of automatic mechanical type change speed gear box vehicle AMT electronics air pressure emergency brake system that is used for that the present invention proposes, this system comprises air compressor, air dryer, pressure regulating valve, preceding air receiver, back air receiver, Parking emergency brake air receiver, brake pedal, dual-chamber brake, rapid release valve, hand brake valve, left and right sides front wheel brake air chamber, left and right sides trailing wheel compressed air brake cylinder, 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 first check valve, an ABS electromagnetic valve and the controller that is used for electronic brake; Annexation is between each parts:
The air compressor mouth links to each other with the input end of air dryer, and the mouth of air dryer links to each other with pressure regulating valve, and the input end that the mouth of this pressure regulating valve connects forward and backward air receiver respectively forms two branch roads; Wherein,
First branch road is: the mouth of preceding air receiver connects the input end of an ABS electromagnetic valve and the input end of dual-chamber brake ante-chamber respectively through a threeway; The mouth of dual-chamber brake ante-chamber connects first check valve; The mouth of the one ABS electromagnetic valve converges to the mouth of first check valve, links to each other with the input end of the 2nd ABS electromagnetic valve and the input end of the 3rd ABS electromagnetic valve respectively through a threeway again; 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 links to each other with off front wheel compressed air brake cylinder admission port with the near front wheel compressed air brake cylinder admission port;
Second branch road is: the mouth of back air receiver links to each other with the second check valve input end with the input end of dual-chamber brake back cavity respectively through a threeway, and the second check valve mouth links to each other with the input end of Parking emergency brake air receiver; The mouth of dual-chamber brake back cavity links to each other with the 4th ABS electromagnetic valve input end; The mouth of the 4th ABS electromagnetic valve links to each other with the preceding compressed air brake cylinder of left rear wheel and the preceding compressed air brake cylinder of off hind wheel respectively through a threeway; The mouth of Parking emergency brake air receiver links to each other with the input end of rapid release valve and the input end of the moving brake activation valve of catcher respectively through a threeway; The mouth of hand brake valve links to each other with the control end of rapid release valve, and the mouth of rapid release valve is received the back compressed air brake cylinder of left rear wheel and the back compressed air brake cylinder of off hind wheel respectively through a threeway;
The one ABS electromagnetic valve also links to each other with controller through lead, and controller links to each other with the CAN bus of vehicle, obtains wheel speed signal, speed-slackening signal, acceleration pedal signal and AMT gear signal; Controller according to incoming signal and the control program that is stored in advance wherein judge, control corresponding instruction is passed to an ABS electromagnetic valve, thereby realizes 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 this method may further comprise the steps:
Step 1) is when vehicle launch, and this electronics air pressure emergency brake system carries out system reset, program initialization; This moment, the one ABS electromagnetic valve was connected brake piping and atmosphere, and an ABS electromagnetic valve is in the pressure release state;
Step 2) judges whether chaufeur has the braking intention: carry the speed-slackening signal of coming to judge whether chaufeur steps on brake pedal according to the CAN bus.If brake pedal is operated; Then controller sends the pressurize instruction to an ABS electromagnetic valve; Make electromagnetic valve switch to packing state, gas gets into the near front wheel compressed air brake cylinder and off front wheel compressed air brake cylinder respectively and takes braking through dual-chamber brake ante-chamber, first check valve, the two or three ABS electromagnetic valve; If brake pedal be not operated or step on by after be released, then get into step 3);
Step 3) judges whether vehicle is in halted state: carry the wheel speed signal of coming to judge the rotation situation of drive wheel according to the CAN bus: if drive wheel wheel speed is not 0, vehicle place state of kinematic motion changes step 5); If drive wheel wheel speed is 0; Then controller sends the pressurize instruction to an ABS electromagnetic valve; Make this ABS electromagnetic valve be in packing state,, change step 4) until carrying the ARC Acceleration Signal of coming to judge the chaufeur bend the throttle through the CAN bus, having the intention of driving;
Step 4) is judged whether vehicle exists and is slipped sloping phenomenon: carry the gear signal of the wheel speed signal of coming, AMT change speed gear box and obtain acceleration signal by speed signal through calculus of differences according to the CAN bus and judge jointly, specifically judge as follows:
(4-1) when drive wheel wheel speed greater than zero the time, if gear is in D Drive D, and the acceleration/accel of drive wheel changes step 5) greater than zero; If gear is not to be in that D Drive D or gear are in forward gear D and the drive wheel acceleration/accel is not more than zero (explain that automobile storage slipping sloping phenomenon), then controller sends the supercharging instruction to an ABS electromagnetic valve, sends the pressurize instruction subsequently again, the commentaries on classics step 3);
(4-2), when drive wheel wheel speed is not more than zero, if gear is in reverse gear R, and the acceleration/accel of drive wheel changes step 5) greater than zero; If gear is not to be in that reverse gear R or gear are in reverse gear R and the drive wheel acceleration/accel is not more than zero, then controller sends the supercharging instruction to an ABS electromagnetic valve, sends the pressurize instruction subsequently again, changes 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; Change step 1) system reset, program initialization afterwards; So constantly circulation is to realize the intellectuality control of automatic mechanical type change speed gear box vehicle electric air pressure braking during standstill.
Characteristics of the present invention and control effect:
On the basis of original brake system, added an ABS electromagnetic valve and a check valve on the structure of the present invention, it is simple in structure, cost of investment is low.Have independently controller in the control; Separate on this controller and the original ABS system architecture; And can reach co-operative control on the function; Its intelligent degree is high, result of use is good, can solve AMT (Automated Mechanical Transmission) automatic mechanical type change speed gear box passenger vehicle, commercial vehicle/comm..vehicle in the uphill starting gearshift procedure because the slide that power interruption causes slope problem, and Parking in the public transit vehicle frequent start-stop process, starting are anti-slips sloping problem.
Description of drawings
Fig. 1 is an electronics air pressure emergency brake system structural representation of the present invention;
Fig. 2 is an electronics air pressure emergency brake system controller block diagram of the present invention;
Fig. 3 is the braking during standstill control flow chart of 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 specify as follows in conjunction with accompanying drawing and embodiment:
The electronics air pressure emergency brake system structure of automatic mechanical type change speed gear box vehicle of the present invention is as shown in Figure 1; This system's constituent elements comprises: air compressor, air dryer, pressure regulating valve, preceding air receiver, back air receiver, Parking emergency brake air receiver, brake pedal, dual-chamber brake, rapid release valve, hand brake valve, left and right sides front-wheel (FL, FR) compressed air brake cylinder (FL, FR air chamber), left and right sides trailing wheel (RL, RR) compressed air brake cylinder (RL, RR air chamber), two check valves (add when wherein first check valve is system of the present invention improvement; Second check valve is that original Pneumatic braking system carries), four ABS electromagnetic valves (wherein an ABS electromagnetic valve is that system of the present invention adds when improving, second, third, the 4th ABS electromagnetic valve is that original Pneumatic braking system carries), a plurality of T-pipe joint and controller and be stored in wherein braking during standstill control program (this controller also is that system of the present invention adds when improving) in advance.
Having only an ABS electromagnetic valve, first check valve and the controller of participating in aux. controls in the said system element is that the present invention adds in order to improve systemic-function, miscellaneous part all when vehicle design the designer match.For an ABS electromagnetic valve and the first check valve correlation parameter choose, then select according to the designing requirement and the particular case of vehicle.
Annexation is following between each parts of this system:
The input end of air compressor output termination air dryer, pipeline is divided into two after output termination one pressure regulating valve of air dryer, pressure regulating valve, and the input end that connects forward and backward air receiver respectively forms two branch roads.
First branch road: the mouth of preceding air receiver connects the input end of an ABS electromagnetic valve and the input end of dual-chamber brake ante-chamber respectively through a threeway; Output termination first check valve of dual-chamber brake ante-chamber; The mouth of an ABS electromagnetic valve converges to through a threeway with the mouth of first check valve again, receives the input end of the 3rd ABS electromagnetic valve of input end and off front wheel (FR) compressed air brake cylinder (FR air chamber) admission port of the 2nd ABS electromagnetic valve that is connected the near front wheel (FL) compressed air brake cylinder (FL air chamber) admission port afterwards more respectively through a threeway.
Second branch road: the mouth of back air receiver is received the input end of dual-chamber brake back cavity respectively through a threeway and is connected to the input end of Parking emergency brake air receiver through 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 the preceding compressed air brake cylinder (air chamber before the RL) of left rear wheel (RL) and the preceding compressed air brake cylinder (air chamber before the RR) of off hind wheel (RR) respectively; The mouth of Parking emergency brake air receiver connects the input end of rapid release valve and the input end of the moving brake activation valve (being installed under the brake-applying handle) of catcher respectively through 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 the back compressed air brake cylinder (RL rear gas chamber) of left rear wheel (RL) and the back compressed air brake cylinder (RR rear gas chamber) of off hind wheel (RR) respectively through a threeway.
Connect with upper pipeline, in first branch road in the past the air receiver mouth link to each other 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 first check valve of dual-chamber brake ante-chamber mouth serial connection again.Remainder is the original brake line of vehicle.The electromagnetic control of wherein controlling an ABS electromagnetic valve of auxiliary braking partly links to each other with controller through lead, and controller links to each other with original CAN bus of vehicle, obtains wheel speed signal, speed-slackening signal, acceleration pedal signal and AMT gear signal; After judging according to the various signals of input, controller sends supercharging, pressurize, decompression instruction to an ABS electromagnetic valve; The electromagnetic control of the one ABS electromagnetic valve partly acts accordingly; Atmosphere is connected, ends, connected to control auxiliary braking pipeline, thereby realize the control of electronics air pressure braking during standstill.
An ABS electromagnetic valve that adopts in the system of the present invention has three mode of operations.(1) when an ABS electromagnetic valve input/output terminal was connected, this electromagnetic valve was in pressurized state; (2) when an ABS electromagnetic valve input/output terminal ended, this electromagnetic valve was in packing state; (3) when an ABS electromagnetic valve input end ended mouth and atmosphere connection, this electromagnetic valve was in decompression state (or being called the pressure release state).Wherein participate in being in the pressure release state under the ABS electromagnetic valve normality of electronics air pressure emergency brake system of the present invention, former be useful on ABS control second, third, be in the conducting pressurized state under the 4th ABS electromagnetic valve normality.
Controller of the present invention is judged according to incoming signal and the control program in micro controller system, stored in advance, then the control corresponding instruction is passed to the electromagnetic control unit of an ABS electromagnetic valve, thereby realizes supercharging, pressurize and the decompression of auxiliary braking system.When system was in initial condition, system reset, an ABS electromagnetic valve was in the pressure release state, can cruising to guarantee vehicle.For dual-chamber brake, when chaufeur was stepped on brake pedal, the main brake pipeline was connected, and high pressure gas are taked braking by the compressed air brake cylinder of air compressor through each wheel of dual-chamber brake arrival.When chaufeur discharged brake pedal, the input end in chamber all was in off condition before and after the dual-chamber brake, and mouth and atmosphere are connected, thereby make the high pressure gas of each wheel braking air chamber be discharged in the air brake off.This also is the reason of the present invention at dual-chamber brake ante-chamber output termination one check valve.Because only in this way, the break-make of front brake circuit just can be controlled by an ABS electromagnetic valve when brake pedal is stepped in chaufeur release.Could realize the electronic and intelligentized type control of emergency brake system.
Controller architecture of the present invention is as shown in Figure 2; Because the control process of native system only needs CAN bus (Controller Area Network; Controller local area network; Use now the most general a kind of data bus on the automobile) 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, so on the employing market the most common single chip computer AT 89S52 as the key control unit of this system.The native system controller mainly is made up of power module, clock module, CAN interface, reset circuit, interrupt request, AT89S52 micro controller system and embedding in advance braking during standstill control program, serial ports output, D/A conversion, amplifying circuit wherein.Wherein power module is used for providing the voltage of normal operation to micro controller system; Clock module is used for clock pulse to micro controller system being provided, in order to counting and timing; The CAN interface is used for the data that the CAN bus provides 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 when 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 information, 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 to convert the digital signal that micro controller system transmits out into analog signal (being mostly voltage signal), so that an ABS electromagnetic valve is controlled; The amplifying circuit function is that the analog signal that D/A is converted to is amplified, so that 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 the controller of electronics air pressure emergency brake system in real time to.Controller is judged the residing state of kinematic motion of vehicle according to these signals, sends control command to an ABS electromagnetic valve, and the break-make of control auxiliary braking pipeline is to realize and to remove auxiliary braking during standstill.Used acceleration signal in this method deterministic process, and do not had acceleration signal in the middle of the signal that the CAN communication bus sends, therefore before judging, controller need carry out calculus of differences to speed signal, to obtain acceleration signal.
It is as shown in Figure 3 that the braking during standstill of this controller is controlled concrete realization flow, may further comprise the steps:
Step 1) when vehicle launch, the system reset of this electronics air pressure emergency brake system, program initialization; This moment, the one ABS electromagnetic valve was connected brake piping and atmosphere, and an ABS electromagnetic valve is in the pressure release state;
Step 2) judges whether chaufeur has the braking intention: carry the speed-slackening signal of coming to judge whether chaufeur steps on brake pedal according to the CAN bus.If brake pedal is operated; Then controller sends the pressurize instruction to an ABS electromagnetic valve; Make electromagnetic valve switch to packing state; Gas gets into the near front wheel (FL) compressed air brake cylinder (FL air chamber) and off front wheel (FR) compressed air brake cylinder (FR air chamber) respectively and takes braking through dual-chamber brake ante-chamber, first check valve, the two or three ABS electromagnetic valve; If brake pedal be not operated or step on by after be released, then get into step 3);
Step 3) judges whether vehicle is in halted state: carry the wheel speed signal of coming to judge the rotation situation of drive wheel according to the CAN bus: if drive wheel wheel speed is not 0, vehicle place state of kinematic motion changes step 5); If drive wheel wheel speed is 0 (explaining that vehicle is in halted state); Then controller sends the pressurize instruction to an ABS electromagnetic valve; Make this ABS electromagnetic valve be in packing state; Until carrying the ARC Acceleration Signal of coming to judge the chaufeur bend the throttle through the CAN bus, having the intention of driving, change step 4);
Step 4) is judged whether vehicle exists and is slipped sloping phenomenon: carry the gear signal of the wheel speed signal of coming, AMT change speed gear box and obtain acceleration signal by speed signal through calculus of differences according to the CAN bus and judge jointly, specifically judge as follows:
(4-1) when drive wheel wheel speed greater than zero the time, if gear is in D Drive D, and the acceleration/accel of drive wheel not be greater than zero (propulsive effort be described greater than brake resistance and the vehicle gravity component downward along the inclined-plane, sloping phenomenon can appear slipping in vehicle), the commentaries on classics step 5); If gear is not to be in that D Drive D or gear are in forward gear D and the drive wheel acceleration/accel is not more than zero (explain that automobile storage is in the sloping phenomenon of slide); Then controller sends the supercharging instruction to an ABS electromagnetic valve; Send pressurize instruction (single supercharging and dwell time need to obtain through debugging according to concrete vehicle condition) subsequently again, change step 3);
(4-2), when drive wheel wheel speed is not more than zero, if gear is in reverse gear R, and the acceleration/accel of drive wheel not be greater than zero (propulsive effort be described greater than brake resistance and the vehicle gravity component downward along the inclined-plane, sloping phenomenon can appear slipping in vehicle), the commentaries on classics step 5); If gear is not to be in that reverse gear R or gear are in reverse gear R and the drive wheel acceleration/accel is not more than zero (explain that automobile storage is in the sloping phenomenon of slide); Then controller sends the supercharging instruction to an ABS electromagnetic valve; Send pressurize instruction (single supercharging and dwell time need to obtain through debugging according to concrete vehicle condition) subsequently again, change 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 be passed through to debug to seek and got a reasonable value), brake off; Change step 1) system reset, program initialization afterwards; So constantly circulation is to realize the intellectuality control of 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 structure of Fig. 1 and the electronics air pressure emergency brake system control flow chart of Fig. 3 vehicle is under the different operating modes, gas flow is explained.
When chaufeur is stepped on brake pedal; The one ABS electromagnetic valve begins to be in two ends by, packing state; This moment, dual-chamber brake was connected brake piping, front-wheel gas flow: air compressor → air dryer → pressure regulating valve → preceding air receiver → dual-chamber brake ante-chamber → first check valve → the two or three ABS electromagnetic valve → left and right sides front wheel brake air chamber (FL, FR air chamber).
When chaufeur discharges brake pedal, if vehicle does not stop, explain that braking to be in order slowing down but not to need Parking in earlier stage, this moment, the one ABS electromagnetic valve made rear end pipeline and atmosphere connect the pressure release brake off.Front-wheel gas flow: left and right sides 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 in by packing state always and since before chaufeur when stepping on brake pedal the high pressure gas of supply can't discharge, front-wheel is in braking mode always.This operating mode is in order to solve the sloping problem of the anti-slide of Parking in the public transit vehicle frequent start-stop process.
Following operating mode is used for solving the passenger vehicle that adopts the AMT automatic mechanical transmission, commercial vehicle/comm..vehicle at the uphill starting gearshift procedure, because the slide that power interruption causes slope problem.
When needs are started to walk, the chaufeur stepping on accelerator pedal.If driving wheel of vehicle wheel speed is greater than zero, judge in conjunction with gear stages whether vehicle slips the slope.If gear is in D Drive D, and the acceleration/accel of drive wheel explains propulsive effort greater than brake resistance greater than zero, and sloping phenomenon can not appear slipping in vehicle.This moment, the one ABS electromagnetic valve was carried out pressure release instruction, brake off.Front-wheel gas flow: left and right sides front wheel brake air chamber (FL, FR air chamber) → the two or three ABS electromagnetic valve → ABS electromagnetic valve → atmosphere; If gear is not to be in that forward gear D or gear are in forward gear D and the drive wheel acceleration/accel is not more than zero, explain that automobile storage is in the sloping phenomenon of slide.This moment, the one ABS electromagnetic valve was carried out the supercharging instruction, carried out pressurize instruction (increasing the concrete vehicle condition of dwell time basis obtains through debugging) afterwards, and then drove the intention judgement.Front-wheel gas flow: an air compressor → air dryer → pressure regulating valve → preceding air receiver → ABS electromagnetic valve → the two or three ABS electromagnetic valve → left and right sides front wheel brake air chamber (FL, FR air chamber).
Equally, if driving wheel of vehicle wheel speed is not more than zero, also to combine gear to judge whether vehicle slips the slope.If gear is in reverse gear R, and the acceleration/accel of drive wheel explains propulsive effort greater than brake resistance greater than zero, and sloping phenomenon can not appear slipping in vehicle.This moment, the one ABS electromagnetic valve was carried out pressure release instruction, brake off.Front-wheel gas flow: left and right sides 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 in reverse gear R or gear to be in and to reverse gear R and the drive wheel acceleration/accel is not more than zero, explain that automobile storage is in the sloping phenomenon of slide.Electromagnetic valve is carried out the pressurization instruction at this moment, carries out pressurize instruction (increasing the concrete vehicle condition of dwell time basis obtains through debugging) afterwards, and then drives the intention judgement.Front-wheel gas flow: an air compressor → air dryer → pressure regulating valve → preceding air receiver → ABS electromagnetic valve → the two or three ABS electromagnetic valve → left and right sides front wheel brake air chamber (FL, FR air chamber).
Claims (2)
1. one kind is used for automatic mechanical type change speed gear box vehicle AMT electronics air pressure emergency brake system, and this system comprises air compressor, air dryer, pressure regulating valve, preceding air receiver, back air receiver, Parking emergency brake air receiver, brake pedal, dual-chamber brake, rapid release valve, hand brake valve, left and right sides front wheel brake air chamber, left and right sides trailing wheel compressed air brake cylinder, 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 first check valve, an ABS electromagnetic valve and the controller that is used for electronic brake; Annexation is between said each parts:
The air compressor mouth links to each other with the input end of air dryer, and the mouth of air dryer links to each other with pressure regulating valve, and the input end that the mouth of this pressure regulating valve connects forward and backward air receiver respectively forms two branch roads; Wherein,
First branch road is: the mouth of preceding air receiver connects the input end of an ABS electromagnetic valve and the input end of dual-chamber brake ante-chamber respectively through a threeway; The mouth of dual-chamber brake ante-chamber connects first check valve; The mouth of the one ABS electromagnetic valve converges to the mouth of first check valve, links to each other with the input end of the 2nd ABS electromagnetic valve and the input end of the 3rd ABS electromagnetic valve respectively through a threeway again; 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 links to each other with off front wheel compressed air brake cylinder admission port with the near front wheel compressed air brake cylinder admission port;
Second branch road is: the mouth of back air receiver links to each other with the second check valve input end with the input end of dual-chamber brake back cavity respectively through a threeway, and the second check valve mouth links to each other with the input end of Parking emergency brake air receiver; The mouth of dual-chamber brake back cavity links to each other with the 4th ABS electromagnetic valve input end; The mouth of the 4th ABS electromagnetic valve links to each other with the preceding compressed air brake cylinder of left rear wheel and the preceding compressed air brake cylinder of off hind wheel respectively through a threeway; The mouth of Parking emergency brake air receiver links to each other with the input end of rapid release valve and the input end of the moving brake activation valve of catcher respectively through a threeway; The mouth of hand brake valve links to each other with the control end of rapid release valve, and the mouth of rapid release valve is received the back compressed air brake cylinder of left rear wheel and the back compressed air brake cylinder of off hind wheel respectively through a threeway;
The one ABS electromagnetic valve also links to each other with controller through lead, and controller links to each other with the CAN bus of vehicle, obtains wheel speed signal, speed-slackening signal, acceleration pedal signal and AMT gear signal; Controller according to incoming signal and the control program that is stored in advance wherein judge, control corresponding instruction is passed to an ABS electromagnetic valve, thereby realizes supercharging, pressurize and the decompression of brake system.
2. an employing is used for the brake control method of automatic mechanical type change speed gear box vehicle AMT electronics air pressure emergency brake system according to claim 1, it is characterized in that this method may further comprise the steps:
Step 1) is when vehicle launch, and this electronics air pressure emergency brake system carries out system reset, program initialization; This moment, the one ABS electromagnetic valve was connected brake piping and atmosphere, and an ABS electromagnetic valve is in the pressure release state;
Step 2) judges whether chaufeur has the braking intention: carry the speed-slackening signal of coming to judge whether chaufeur steps on brake pedal according to the CAN bus.If brake pedal is operated; Then controller sends the pressurize instruction to an ABS electromagnetic valve; Make electromagnetic valve switch to packing state, gas gets into the near front wheel compressed air brake cylinder and off front wheel compressed air brake cylinder respectively and takes braking through dual-chamber brake ante-chamber, first check valve, the two or three ABS electromagnetic valve; If brake pedal be not operated or step on by after be released, then get into step 3);
Step 3) judges whether vehicle is in halted state: carry the wheel speed signal of coming to judge the rotation situation of drive wheel according to the CAN bus: if drive wheel wheel speed is not 0, vehicle place state of kinematic motion changes step 5); If drive wheel wheel speed is 0; Then controller sends the pressurize instruction to an ABS electromagnetic valve; Make this ABS electromagnetic valve be in packing state,, change step 4) until carrying the ARC Acceleration Signal of coming to judge the chaufeur bend the throttle through the CAN bus, having the intention of driving;
Step 4) is judged whether vehicle exists and is slipped sloping phenomenon: carry the gear signal of the wheel speed signal of coming, AMT change speed gear box and obtain acceleration signal by speed signal through calculus of differences according to the CAN bus and judge jointly, specifically judge as follows:
(4-1) when drive wheel wheel speed greater than zero the time, if gear is in D Drive D, and the acceleration/accel of drive wheel changes step 5) greater than zero; If gear is not to be in that D Drive D or gear are in forward gear D and the drive wheel acceleration/accel is not more than zero (explain that automobile storage slipping sloping phenomenon), then controller sends the supercharging instruction to an ABS electromagnetic valve, sends the pressurize instruction subsequently again, the commentaries on classics step 3);
(4-2), when drive wheel wheel speed is not more than zero, if gear is in reverse gear R, and the acceleration/accel of drive wheel changes step 5) greater than zero; If gear is not to be in that reverse gear R or gear are in reverse gear R and the drive wheel acceleration/accel is not more than zero, then controller sends the supercharging instruction to an ABS electromagnetic valve, sends the pressurize instruction subsequently again, changes 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; Change step 1) system reset, program initialization afterwards; So constantly circulation is to realize the intellectuality control of automatic mechanical type change speed gear box vehicle electric air pressure braking during standstill.
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| CN104608755A (en) * | 2015-01-30 | 2015-05-13 | 河南护航实业股份有限公司 | Van electric control air brake device |
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| CN107914689A (en) * | 2017-11-08 | 2018-04-17 | 湖北航天技术研究院特种车辆技术中心 | A kind of parking braking system |
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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 |