CN104494584A - Six-channel ABS - Google Patents
Six-channel ABS Download PDFInfo
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- CN104494584A CN104494584A CN201410706221.0A CN201410706221A CN104494584A CN 104494584 A CN104494584 A CN 104494584A CN 201410706221 A CN201410706221 A CN 201410706221A CN 104494584 A CN104494584 A CN 104494584A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/171—Detecting parameters used in the regulation; Measuring values used in the regulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/172—Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/17—Using electrical or electronic regulation means to control braking
- B60T8/176—Brake regulation specially adapted to prevent excessive wheel slip during vehicle deceleration, e.g. ABS
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a six-channel anti-lock braking system (ABS). The ABS comprises a main control chip, six wheel speed sensors and six ABS adjuster electromagnetic valves. The main control chip is connected with a wheel speed signal processing unit, a driving control unit, a bus communication unit and a storage unit. The six wheel speed sensors are connected with the wheel speed signal processing unit; and the six ABS adjuster electromagnetic valves are connected with the driving control unit. The six-channel ABS has various advantages of being simple in structure, comprehensive in performance, optimized in performance and the like. The six-channel ABS can be widely applied to multi-axle commercial vehicles.
Description
Technical field
The present invention relates to the ABS technology for automobile brake, particularly relate to a kind of Hexamermis spp ABS system.
Background technology
Technology word is explained:
CAN: the abbreviation being controller local area network (Controller Area Network, CAN) is one of most widely used fieldbus in the world.
ASR: the abbreviation being Anti-Slip Regulation, is also anti-slip regulation, and be a set of device preventing drive wheel from skidding based on ABS system, this system can carry out actv. control to drive wheel and driving engine.
EBD: EBD (Electric Brakeforce Distribution).
TPM: tire pressure monitoring system indirectly, TPM is the abbreviation of TirePressure Monitoring.
ABS is the abbreviation of Anti-lock Braking System, i.e. anti-blocking brake system of automobile, is a kind of electronic control system of monitoring and controlling car speed during braking.The development of described anti-blocking brake system of automobile can be traced back to early in the twentieth century, its task is the wheel lockup (especially on smooth road surface) preventing from causing because braking force is excessive, therefore, by using anti-blocking brake system of automobile, even if full application of brake just can be made also to maintain transverse traction force, ensure that the optimum efficiency of the stability of driving and the course changing control of vehicle and main trailer braking protection valve harmony, ensure that the optimization of drag friction between available tire and road surface and vehicle deceleration and stopping distance simultaneously.
Four-way abs controller on sale in the market, it independently can only control 4 wheels, and therefore, it can not meet the braking effect requirement of the multiaxis commercial vehicle/comm..vehicle of high-power, large load-carrying capacity.And the integrated functionality of current ABS system is single, therefore, it only can be applied to minority on market and on the vehicle of low configuration.
Summary of the invention
In order to the braking effect requirement making ABS system can meet multiaxis commercial vehicle/comm..vehicle, the object of this invention is to provide a kind of Hexamermis spp ABS system.
The technical solution adopted in the present invention is: a kind of Hexamermis spp ABS system, it comprises main control chip, six vehicle-wheel speed sensors and six ABS regulating control electromagnetic valves, described main control chip is connected to wheel speed signal processing unit, driving control unit, bus communication unit and memory cell, described six vehicle-wheel speed sensors are all connected with wheel speed signal processing unit, described six ABS regulating control electromagnetic valves are all connected with driving control unit, the wheel speed signal that described main control chip exports for obtaining vehicle-wheel speed sensor, then the slippage rate of wheel is calculated according to the wheel speed signal obtained, according to the slippage rate calculated ABS regulating control electromagnetic valve controlled.
Further, described wheel speed signal processing unit comprises wheel speed signal treatment circuit, and described vehicle-wheel speed sensor is connected with wheel speed signal treatment circuit, and described wheel speed signal treatment circuit is connected with main control chip;
Described wheel speed signal treatment circuit comprises voltage comparator circuit and RC low-pass filter circuit, the described mouth of RC low-pass filter circuit is connected with the negative input end of voltage comparator circuit, and the mouth of described vehicle-wheel speed sensor is connected with the input end of RC low-pass filter circuit and the positive input terminal of voltage comparator circuit respectively.
Further, described voltage comparator circuit comprises the first electric capacity, the first resistance, the second resistance, the 3rd resistance and voltage comparator, and described RC low-pass filter circuit comprises the 4th resistance, the second electric capacity and the 3rd electric capacity;
One termination first power supply of described first resistance, the other end of described first resistance respectively with one end of the first electric capacity, one end of second resistance and one end of the 4th resistance connect, the other end ground connection of described first electric capacity, the other end of described second resistance is connected with one end of the 3rd resistance and the positive input terminal of voltage comparator respectively, the other end of described 3rd resistance is connected with the mouth of voltage comparator, the other end of described 4th resistance is connected with one end of the second electric capacity and the negative input end of voltage comparator respectively, the other end of described second electric capacity is connected with one end of the 3rd electric capacity, the other end ground connection of described 3rd electric capacity,
The described other end of the first resistance is connected with the mouth of vehicle-wheel speed sensor.
Further, described wheel speed signal treatment circuit also comprises the 5th resistance and the 4th electric capacity, and one end of described first electric capacity is connected with one end of the 5th resistance, and the other end of described 5th resistance is connected with one end of the 4th electric capacity, the other end ground connection of described 4th electric capacity.
Further, described driving control unit comprises drived control chip, described drived control chip is connected with branch road, described branch road comprises the 6th resistance, the 7th resistance and the 5th electric capacity, the control end of described main control chip is connected with the input end of drived control chip, and the mouth of described drived control chip is connected with the control end of ABS regulating control electromagnetic valve and mouth respectively;
The mouth of described drived control chip is also connected with one end of one end of the 5th electric capacity, one end of the 6th resistance and the 7th resistance respectively, the other end ground connection of described 5th electric capacity, another termination second source of described 6th resistance, the described other end of the 7th resistance is connected with the I/O port of main control chip.
Further, described bus communication unit is CAN communication unit, described CAN communication unit comprises CAN transceiver interface chip and common mode choke, and described CAN transceiver interface chip is connected with main control chip, and described common mode choke comprises the first coil and the second coil; The CANH end of described CAN transceiver interface chip is connected with one end of the first coil, and the CANL end of described CAN transceiver interface chip is connected with one end of the second coil.
Further, described CAN communication unit also comprises the 8th resistance, the 9th resistance, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the first zener diode, the second zener diode, the 3rd zener diode and the 4th zener diode;
The other end of described first coil is connected with one end of the 8th resistance and one end of the 7th electric capacity respectively, the other end of described 8th resistance is connected with one end of the 3rd power supply, the 9th resistance and one end of the 6th electric capacity respectively, the other end of described 9th resistance is connected with the other end of the second coil and one end of the 8th electric capacity respectively, the equal ground connection of the other end of the other end of described 7th electric capacity, the other end of the 6th electric capacity and the 8th electric capacity;
The other end of described first coil is also connected with the negative pole of the first zener diode, the positive pole of described first zener diode is connected with the positive pole of the second zener diode, the negative earth of described second zener diode, the other end of described second coil is also connected with the negative pole of the 3rd zener diode, the positive pole of described 3rd zener diode is connected with the positive pole of the 4th zener diode, the negative earth of described 4th zener diode.
Further, it also comprises ASR differential braking valve, and described ASR differential braking valve is connected with driving control unit;
Described main control chip comprises RBT ASR module, the wheel speed signal that described RBT ASR module exports for obtaining vehicle-wheel speed sensor, judge whether wheel skids according to the wheel speed signal obtained, then by control ASR differential braking valve the ABS regulating control electromagnetic valve pair drive axle corresponding with the wheel of skidding braked.
Further, described main control chip also comprises EBD functional module, the wheel speed signal that described EBD functional module exports for obtaining vehicle-wheel speed sensor, thus calculate the adhesive ability of each wheel, automatically adjusts brake-pressure according to the adhesive ability calculated.
Further, described main control chip also comprises TPM functional module and/or hill start supplemental functionality;
The wheel speed signal that described TPM functional module exports for obtaining vehicle-wheel speed sensor, thus calculate the tire rolling radius of wheel, realizes tire pressure monitoring function according to the tire rolling radius calculated;
Described hill start supplemental functionality is used for judging whether to meet assist brake entry condition, when judged result is for being, then controls trailing wheel pressurize, thus prevents vehicle from slipping car.
The invention has the beneficial effects as follows: Hexamermis spp ABS system of the present invention is provided with six vehicle-wheel speed sensors and six ABS regulating control electromagnetic valves, six described vehicle-wheel speed sensors are respectively right front wheel speed sensor, front left wheel speed sensor, right vehicle-wheel speed sensor, left vehicle-wheel speed sensor, right rear wheel speed sensor and rear left wheel speed sensor, six described ABS regulating control electromagnetic valves are respectively the near front wheel regulating control electromagnetic valve, off front wheel regulating control electromagnetic valve, right wheel regulator electromagnetic valve, left center regulating control electromagnetic valve, off hind wheel regulating control electromagnetic valve and left rear wheel regulating control electromagnetic valve, therefore, compared to traditional four-way abs controller, ABS system of the present invention is many two vehicle-wheel speed sensors and regulating control electromagnetic valve, so just, can be applicable in multiaxis commercial vehicle/comm..vehicle, the braking effect requirement of multiaxis commercial vehicle/comm..vehicle can be met.
In addition, main control chip of the present invention includes RBT ASR module, EBD functional module, TPM functional module and hill start supplemental functionality, therefore, except ABS function, ABS system of the present invention can also realize RBT ASR, EBD function, TMP function and hill start additional function, function is more comprehensive, thus uses the operating experience sense of user better, and commercial value is higher.And ABS system of the present invention also has advantages such as structure is simple, performance optimization.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further:
Fig. 1 is the structured flowchart of a kind of Hexamermis spp ABS of the present invention system;
Fig. 2 is the structured flowchart of wheel speed signal treatment circuit in a kind of Hexamermis spp ABS of the present invention system;
Fig. 3 is a specific embodiment electronic circuit schematic of Fig. 2 wheel speed signal treatment circuit;
Fig. 4 is a specific embodiment electronic circuit schematic of driving control unit in a kind of Hexamermis spp ABS of the present invention system;
Fig. 5 is a specific embodiment electronic circuit schematic of CAN communication unit in a kind of Hexamermis spp ABS of the present invention system.
Detailed description of the invention
As shown in Figure 1, a kind of Hexamermis spp ABS system, it comprises main control chip, six vehicle-wheel speed sensors and six ABS regulating control electromagnetic valves, described main control chip is connected to wheel speed signal processing unit, driving control unit, bus communication unit and memory cell, described six vehicle-wheel speed sensors are all connected with wheel speed signal processing unit, described six ABS regulating control electromagnetic valves are all connected with driving control unit, the wheel speed signal that described main control chip exports for obtaining vehicle-wheel speed sensor, then the slippage rate of wheel is calculated according to the wheel speed signal obtained, according to the slippage rate calculated ABS regulating control electromagnetic valve controlled, to realize automotive anti-lock braking.Six described vehicle-wheel speed sensors are respectively right front wheel speed sensor, front left wheel speed sensor, right vehicle-wheel speed sensor, left vehicle-wheel speed sensor, right rear wheel speed sensor and rear left wheel speed sensor, and six described ABS regulating control electromagnetic valves are respectively the near front wheel regulating control electromagnetic valve, off front wheel regulating control electromagnetic valve, right wheel regulator electromagnetic valve, left center regulating control electromagnetic valve, off hind wheel regulating control electromagnetic valve and left rear wheel regulating control electromagnetic valve.
For the principle of work of ABS system, it is specially: the wheel speed signal of 6 vehicle-wheel speed sensor outputs inputs in main control chip after wheel speed signal processing unit processes, the wheel speed signal that described main control chip exports according to each vehicle-wheel speed sensor, thus calculate the reference speed of automobile, each wheel velocity and deceleration/decel, to determine the slippage rate of each wheel, then the slippage rate control gate limit value of the slippage rate calculated and setting is compared, when the slippage rate of certain wheel has exceeded the slippage rate control gate limit value of setting, then drived control output command reduces pressure to ABS regulating control electromagnetic valve, the pressure of this wheel braking air chamber is reduced, when the slippage rate of certain wheel does not exceed the slippage rate control gate limit value of setting, then drived control output command carries out supercharging to ABS regulating control electromagnetic valve, makes the pressure increase of this wheel braking air chamber, when the slippage rate of certain wheel is close to the slippage rate control gate limit value set, then drived control output command carries out pressurize to ABS regulating control electromagnetic valve, makes this wheel braking air chamber pressure keep certain.The slippage rate of each wheel so then can be made to remain within desirable scope, prevent wheel lockup.In addition, in braking procedure, if do not have wheel to be tending towards locking, ABS system will not participate in the control of brake-pressure, and now braking procedure is identical with conventional braking system braking procedure.Further, when ABS breaks down, drived control will no longer control ABS regulating control electromagnetic valve, and the ABS alarm lamp on instrument carrier panel is lighted, send signal to chaufeur, now ABS, braking procedure is by identical with the working process of the conventional braking system not having ABS.
Obtained by above-mentioned, because ABS system of the present invention is provided with six vehicle-wheel speed sensors and six ABS regulating control electromagnetic valves, compared to traditional four-way ABS system many two vehicle-wheel speed sensors and ABS regulating control electromagnetic valve, therefore, ABS system of the present invention can be applicable in multiaxis commercial vehicle/comm..vehicle, can meet the braking effect requirement of multiaxis commercial vehicle/comm..vehicle.
Be further used as preferred embodiment, described wheel speed signal processing unit comprises wheel speed signal treatment circuit, and described vehicle-wheel speed sensor is connected with wheel speed signal treatment circuit, and described wheel speed signal treatment circuit is connected with main control chip;
As shown in Figure 2, described wheel speed signal treatment circuit comprises voltage comparator circuit and RC low-pass filter circuit, the described mouth of RC low-pass filter circuit is connected with the negative input end of voltage comparator circuit, and the mouth of described vehicle-wheel speed sensor is connected with the input end of RC low-pass filter circuit and the positive input terminal of voltage comparator circuit respectively.A vehicle-wheel speed sensor correspondence connects a wheel speed signal treatment circuit, and therefore, wheel speed signal processing unit of the present invention should comprise six wheel speed signal treatment circuits.
Be further used as preferred embodiment, as shown in Figure 3, described voltage comparator circuit comprises the first electric capacity C1, the first resistance R1, the second resistance R2, the 3rd resistance R3 and voltage comparator, and described RC low-pass filter circuit comprises the 4th resistance R4, the second electric capacity C2 and the 3rd electric capacity C3;
The one termination first power supply VCC of described first resistance R1, the other end of described first resistance R1 respectively with one end of the first electric capacity C1, one end of second resistance R2 and one end of the 4th resistance R4 connect, the other end ground connection of described first electric capacity C1, the other end of described second resistance R2 is connected with one end of the 3rd resistance R3 and the positive input terminal of voltage comparator respectively, the described other end of the 3rd resistance R3 is connected with the mouth OUT of voltage comparator, the other end of described 4th resistance R4 is connected with one end of the second electric capacity C2 and the negative input end of voltage comparator respectively, the other end of described second electric capacity C2 is connected with one end of the 3rd electric capacity C3, the other end ground connection of described 3rd electric capacity C3,
The other end of described first resistance R1, i.e. terminal A, is connected with the mouth of vehicle-wheel speed sensor.
For described wheel speed signal treatment circuit, its principle of work is: after the wheel speed signal export vehicle-wheel speed sensor and VREF (Voltage Reference) compare process, thus export main control chip to and carry out analyzing and processing, and described VREF (Voltage Reference), it is that the wheel speed signal that exported by vehicle-wheel speed sensor is converted after RC low-pass filtering treatment.Can obtain thus, wheel speed signal treatment circuit of the present invention is without the need to adopting a private circuit to carry out the output of VREF (Voltage Reference), only need between the mouth and the negative input end of voltage comparator circuit of vehicle-wheel speed sensor, be provided with a RC low-pass filter circuit just can, therefore, the present invention have that structure is simple, small volume and the advantage such as cost is lower.
In addition, for the terminal B shown in Fig. 3, by gathering the voltage of terminal B, i.e. VREF (Voltage Reference), just according to the size of VREF (Voltage Reference), thus can realize the detection of vehicle-wheel speed sensor volatile fault.
Be further used as preferred embodiment, described wheel speed signal treatment circuit also comprises the 5th resistance R5 and the 4th electric capacity C4, one end of described first electric capacity C1 is connected with one end of the 5th resistance R5, the other end of described 5th resistance R5 is connected with one end of the 4th electric capacity C4, the other end ground connection of described 4th electric capacity C4.By gathering the voltage of the end points C shown in Fig. 3, the detection of vehicle-wheel speed sensor short circuit and open circuit fault can be realized.
Be further used as preferred embodiment, described driving control unit comprises drived control chip, described drived control chip is connected with branch road, described branch road comprises the 6th resistance, the 7th resistance and the 5th electric capacity, the control end of described main control chip is connected with the input end of drived control chip, and the mouth of described drived control chip is connected with the control end of ABS regulating control electromagnetic valve and mouth respectively;
The mouth of described drived control chip is also connected with one end of one end of the 5th electric capacity, one end of the 6th resistance and the 7th resistance respectively, the other end ground connection of described 5th electric capacity, another termination second source of described 6th resistance, the described other end of the 7th resistance is connected with the I/O port of main control chip.For the number of drived control chip, and the number of branch road that drived control chip connects, should arrange according to actual conditions.
For this embodiment of the present invention, as shown in Figure 4, described driving control unit have employed 2 BTS724G chips and realizes, BTS724G chip includes 4 input ends, be respectively IN1, IN2, IN3 and IN4, and BTS724G chip includes 4 mouths, be respectively OUT1, OUT2, OUT3 and OUT4, 4 input ends of described BTS724G chip are all connected with the control end of main control chip, 4 mouths of BTS724G chip connect one to one with 4 branch roads respectively, and connect one to one with the control end of 4 ABS regulating control electromagnetic valves and mouth respectively.As shown in Figure 4, the mouth OUT1 of BTS724G chip, i.e. end points JO0, it is connected with the control end of an ABS regulating control electromagnetic valve and mouth respectively, and it is also connected with a branch road; Described branch road comprises electric capacity C332, resistance R322 and resistance R332, the mouth OUT1 of BTS724G chip, i.e. end points JO0, it is also connected with one end of one end of electric capacity C332, one end of resistance R322 and resistance R332 respectively, the other end ground connection of described electric capacity C332, another termination second source of resistance R322, the other end of resistance R332 is connected with the I/O port of main control chip.
By the other end of the I/O port processing resistance R332 of main control chip, i.e. JO0T end, voltage, just the detection to ABS regulating control electromagnetic valve short interruption fault can be realized, and for the detection to ABS regulating control electromagnetic valve short interruption fault, its principle of work is: the mouth that main control chip controls drived control chip exports high level, when the voltage of JO0T end is high level, then represent that ABS regulating control electromagnetic valve is normal, when the voltage of JO0T end is low level, then represent that ABS regulating control electromagnetic valve is short-circuited fault; Main control chip controls the mouth output low level of drived control chip, when the voltage of JO0T end is low level, then represents that ABS regulating control electromagnetic valve is normal, when the level of JO0T end is high level, then represents ABS regulating control electromagnetic valve generation open circuit fault.
Obtained by above-mentioned, the structure of driving control unit of the present invention is simple, and it can not only realize the function of drived control ABS regulating control electromagnetic valve, but also can realize the short interruption fault detection capability to ABS regulating control electromagnetic valve.In addition, for main control chip of the present invention, it is adopt loop control theory to the control principle of drived control chip, therefore, can ensure that ABS regulating control electromagnetic valve also can realize conventional brake when breaking down like this.
Be further used as preferred embodiment, described bus communication unit is CAN communication unit, as shown in Figure 5, described CAN communication unit comprises CAN transceiver interface chip and common mode choke, the TXD end of described CAN transceiver interface chip is all connected with main control chip with RXD end, and described common mode choke comprises the first coil and the second coil;
The CANH end of described CAN transceiver interface chip and one end of the first coil, i.e. end points 1, connects, and the CANL end of described CAN transceiver interface chip and one end of the second coil, i.e. end points 3, connects.And the other end of the first coil, i.e. end points 2, and the other end of the second coil, i.e. end points 4, they are as the coupling end be connected with peripheral hardware.Described CAN transceiver interface chip can be 82C250 chip.
CAN belongs to the category of fieldbus, the serial communication network that it is a kind of effective support distributed AC servo system or controls in real time.Than the dcs that current many RS-485 build based on R line, the dcs based on CAN has obvious preceence in the following areas:
(1), data communication between each node of network is real-time, first, CAN controller works in various ways, each node in network all can adopt the mode of the bit-by-bit arbitration of harmless structure to compete according to bus access preceence (depending on message identifier) and send data to bus, and CAN protocol has abolished station address coding, and replace communication data is encoded, this can make different nodes receive identical data simultaneously, data communication between each node of the network that these features make CAN form is real-time, and easily form redundancy structure, the reliability of raising system and the alerting ability of system, and utilize RS-485 can only form primary and secondary structure system, signalling methods also can only carry out in the mode of main website poll, the real-time of system, reliability is poor,
(2), shorten time-to-market, CAN communication unit is connected with physical bus by two mouth CANH with CANL of CAN transceiver interface chip 82C250, and the state of CANH end can only be high level or suspended state, CANL end can only be low level or suspended state, this just ensures to appear at the phenomenon in RS-485 network, namely when system is wrong, when occurring that multinode sends data to bus simultaneously, bus is caused to present short circuit, thus damage the phenomenon of some node, and CAN node has when mistake is serious and automatically closes output function, to make the operation of other nodes in bus unaffected, thus ensure there will not be to resemble in a network, because respective nodes goes wrong, bus is made to be in " deadlock " state, also have, the perfect communication protocol that CAN has can be realized by CAN controller chip and interface chip thereof, thus greatly reduce system development difficulty, shorten time-to-market, these only have the RS-485 of electric agreement incomparable.
In addition, with other fieldbus comparatively speaking, CAN has high, the easy realization of traffic rate and a kind of fieldbus having formed international standard of the various features such as cost performance is high.These are also that current CAN is applied to various fields, have the major reason of the powerful market competitiveness.
And for CAN communication unit of the present invention, its CANH at CAN transceiver interface chip holds and CANL end is connected to a common mode choke, therefore, it is possible to be used for suppressing common mode interference (connection interference).Because CAN high-speed signal transmission lines is with there is certain difference of potential institute between ground wire to create common mode interference.Such existence interference, the signal so utilizing CAN to transmit will distortion, thus causes miscommunication.In order to eliminate this interference, in the circuit of CAN communication unit, add common mode choke, it can eliminate the common mode interference from ground wire, and the EMC interference of 80%.And CAN line of the present invention belongs to a differential signal, and the decay of common mode choke to differential signal is very little, so then can ensure that the distortion level of signal reduces greatly, and, add common mode choke, the symmetry of signal transmission can also be increased.
The principle that described common mode choke plays Anti-Jamming is: the filter circuit of common mode inductance, La and Lb is exactly common mode inductance coil.These two coils around on same iron core, the number of turn and phase place all identical (coiling is reverse).Like this, when the normal current in circuit flows through common mode inductance, electric current produces reverse magnetic field and cancels out each other in the inductance coil of same-phase coiling, and now normal signal electric current is mainly by the impact (with a small amount of damping caused because of leakage inductance) of coil resistance; When there being common mode current flowing through coil, due to the same tropism of common mode current, magnetic field in the same way can be produced in coil and increasing the induction reactance of coil, making coil show as high resistance, produce stronger damping, with this attenuation common-mode electric current, reach the object of filtering.
In summary it can be seen CAN serial communication, have very large advantage relative to other communication modes.The real-time of CAN is than UART, RS-232/485 and ether net height, and safety is high with accuracy.Therefore, more accurately, safely data transmission communication can be carried out with other peripheral hardware by CAN communication.
Preferably, as shown in Figure 5, described CAN communication unit also comprises the 8th resistance R8, the 9th resistance R9, the 6th electric capacity C6, the 7th electric capacity C7, the 8th electric capacity C8, the first zener diode D1, the second zener diode D2, the 3rd zener diode D3 and the 4th zener diode D4;
The other end of described first coil, i.e. end points 2, be connected with one end of the 8th resistance R8 and one end of the 7th electric capacity C7 respectively, the other end of described 8th resistance R8 is connected with one end of the 3rd power supply, the 9th resistance R9 and one end of the 6th electric capacity C6 respectively, the other end of described 9th resistance R9 respectively with the other end of the second coil, i.e. end points 4, be connected with one end of the 8th electric capacity C8, the equal ground connection of the other end of the other end of described 7th electric capacity C7, the other end of the 6th electric capacity C6 and the 8th electric capacity C8;
The other end of described first coil, i.e. end points 2, also be connected with the negative pole of the first zener diode D1, the positive pole of described first zener diode D1 is connected with the positive pole of the second zener diode D2, the negative earth of described second zener diode D2, the other end of described second coil, i.e. end points 4, also be connected with the negative pole of the 3rd zener diode D3, the positive pole of described 3rd zener diode D3 is connected with the positive pole of the 4th zener diode D4, the negative earth of described 4th zener diode D4.By arranging such protective circuit, the safety and reliability that CAN communication unit carries out data transmission communication greatly can be improved.
Be further used as preferred embodiment, ABS system of the present invention, it also comprises ASR differential braking valve, described ASR differential braking valve is connected with driving control unit, as shown in Figure 4, described driving control unit employing BTS723G chip realizes the drived control to ASR differential braking valve, the input end of BTS723G chip is connected with the control end of main control chip, the mouth of BTS723G chip is connected with the control end of ASR differential braking valve and mouth respectively, and the mouth of BTS723G chip, namely ASR FA holds, also respectively with one end of electric capacity C541, one end of resistance R529 and one end of resistance R539 connect, the other end ground connection of described electric capacity C541, the one termination second source of resistance R529, the other end of resistance R539, i.e. JO9T end, be connected with the I/O port of main control chip, like this, as shown in the above, then can not only carry out drived control to ASR differential braking valve, and can also detect the short interruption fault of ASR differential braking valve,
Described main control chip comprises RBT ASR module, the wheel speed signal that described RBT ASR module exports for obtaining vehicle-wheel speed sensor, judge whether wheel skids according to the wheel speed signal obtained, then by control ASR differential braking valve the ABS regulating control electromagnetic valve pair drive axle corresponding with the wheel of skidding braked.In addition, described RBT ASR module is also for controlling driving engine.
ASR, it is the abbreviation of Anti-Slip Regulation, is also anti-slip regulation, and be a set of device preventing drive wheel from skidding based on ABS system, this system can carry out actv. control to drive wheel and driving engine.Its effect prevents drive wheel in vehicle starting, accelerator from skidding, drive wheel idle running when particularly preventing automobile on asymmetric road surface or turn, and by slip-based controller in 10%-20% scope.ASR system grows up on the basis of ABS.The principle of ASR is that the slippage of the drive wheel of skidding is compared with non-skidding wheel, and making it remain on provides the scope of Ideal Traction power and stability, with the tractive force produced, and keeps the stability of vehicle.As the Function Extension of ABS system, Anti-slip regulation device ASR can significantly improve the starting of vehicle on wet-skid road surface and acceleration capability.ABS certain modification just can realize RBT ASR.The signal that described RBT ASR module sends according to six vehicle-wheel speed sensors of Hexamermis spp ABS system judges whether wheel skids, then by control ASR differential braking valve, after making it be excited, its gas port is opened, and gas passes through, and implements to brake to make the ABS regulating control electromagnetic valve pair drive axle corresponding with the wheel skidded, namely braking is implemented to drive wheel, thus the tractive force produced, prevent tyre skidding, keep the stability of vehicle.In addition, described RBT ASR module also can be used for controlling driving engine by sending CAN order, when drive wheel skids, controls engine speed, exports maximum drive torque, control drive wheel rotating speed, thus reduce slip rate, improve propulsive effort.Now, described bus communication unit is CAN communication unit, and it is connected with the CAN interface of driving engine.
By adopting above-mentioned RBT ASR module, its effect brought includes:
(1), when the one-sided skidding of drive wheel, differential braking can be carried out to the wheel skidded;
(2), engine control;
(3), can work with differential braking simultaneously;
(4), under various road surface, the optimal starting of vehicle is made;
(5), vehicle can be made more stable when crossing curved;
(6), in control process, ASR indicator lamp can activate and relevant CAN information can be sent out out.
Be further used as preferred embodiment, described main control chip also comprises EBD functional module, the wheel speed signal that described EBD functional module exports for obtaining vehicle-wheel speed sensor, according to the wheel speed signal obtained, calculate the adhesive ability of each wheel, then according to the adhesive ability of each wheel calculated, just can judge vehicle now as unloaded, fully loaded, front heavy or after the state such as heavily, thus automatically adjust brake-pressure, can stopping distance be shortened like this, the traveling comfort of driving is provided.Described EBD, it is the abbreviation of Electronic Brake force Distribution, and Chinese is EBD (Electric Brakeforce Distribution).
Also be provided with EBD functional module in ABS system of the present invention, effectively can supplement like this to ABS system, it generally can combinationally use with ABS, can improve effect of ABS.When there is emergency braking, EBD is before ABS effect, can according to the weight of vehicle body and pavement conditions, automatic is the sliding ratio that benchmark removes to compare rear tire with front-wheel, during as realized that this difference degree must be adjusted, brake system will adjust the brake-pressure of wheel, more to be balanced and to distribute closer to Utopian brake weight.
EBD function is the slip rate and the vehicle deceleration that calculate back axle based on the vehicle-wheel speed sensor of ABS system, and when the vehicle slip rate of back axle and deceleration/decel of vehicle in braking procedure exceed the scope of setting, EBD starts to work.When band EBD function installed by vehicle, the delivery pressure of back axle can change along with the difference of load.
When brake, all wheels all can action, to be stopped by vehicle.But because condition of road surface has variation, add the transfer of vehicle's center of gravity during deceleration, the earth-grasping force between wheel and ground is by different.Brake strength on average can be dispensed to each wheel by traditional brake system.From the foregoing, such distribution does not also meet the utilization benefit of brake weight.And by adopting EBD functional module, just brake weight can be made best application.
EBD function can in the moment of automobile brake, supercomputing goes out the friction value that all tire produces due to the difference of adhesive ability, then brake equipment is adjusted, make the adjustment at a high speed of its program on the go according to setting, reach mating of braking force and friction force (tractive force), with ensure vehicle steadily and safety.When emergency brake wheel lockup, EBD had just balanced effective ground earth-grasping force of each wheel before ABS action, can prevent whipping and sidesway, and shorten automobile brake distance.
Be further used as preferred embodiment, described main control chip also comprises TPM functional module and/or hill start supplemental functionality.
For described TPM functional module, its wheel speed signal exported for obtaining vehicle-wheel speed sensor, thus calculate the tire rolling radius of wheel, realizes tire pressure monitoring function according to the tire rolling radius calculated.TPM is the abbreviation of TirePressure Monitoring, and Chinese is indirect tire pressure monitoring system.
The wheel speed signal that TPM functional module is obtained by vehicle-wheel speed sensor, thus the tire rolling radius calculating wheel.When the air pressure of certain tire declines, tire rolling radius reduces, wheel speed increases, when system after the alarm range reaching setting can be undertaken report to the police (when RBT ASR works, indicator lamp glimmers) by ASR indicator lamp Chang Liang.Further, it is realized by the program of amendment main control chip inside, do not need to install extra parts in ABS system.
Described hill start supplemental functionality is used for judging whether to meet assist brake entry condition, when judged result is for being, then controls trailing wheel pressurize 3 seconds, thus prevents vehicle from slipping car.For described hill start supplemental functionality, its needs vehicle with CAN function just can, the engine CAN bus of vehicle and the CAN communication unit connecting communication of present system.Like this, when just can solve manual vehicle half-slope starting by adopting hill start supplemental functionality, slip car phenomenon, the hidden danger that the car that effectively prevents from slipping produces.Hill start supplemental functionality is through CAN communication, and control ASR differential braking valve realizes assist brake.
1, assist brake entry condition
A, vehicle do not have speed.
B, step on service brake and must reach more than 2 seconds.
2, assist brake condition subsequent
Method one: unclamp service brake, step on the accelerator in 3 seconds, assist brake slow release.
Method two: unclamp service brake, not step on the accelerator, after 3 seconds, assist brake automatically terminates.
3, function declaration:
1., vehicle has speed, even if step on brake also can not start assist brake.
2., vehicle removes the method for assist brake at upward slope, descending, level road is that step on the accelerator is removed or unclamped service brake and removes after 3 seconds.
In addition, for ABS system of the present invention, described main control chip is also connected to PMU and fault manage-ment cells.
Obtained by above-mentioned, ABS system architecture of the present invention is simple, and ABS system of the present invention also has RBT ASR, EBD function, TPM function, hill start additional function, power management and fault management capability, therefore ABS system of the present invention also has complete function, the advantages such as performance optimization, can be widely used on multiaxis commercial vehicle/comm..vehicle.
More than that better enforcement of the present invention is illustrated, but the invention is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite without prejudice to spirit of the present invention, and these equivalent distortion or replacement are all included in the application's claim limited range.
Claims (10)
1. a Hexamermis spp ABS system, it is characterized in that: it comprises main control chip, six vehicle-wheel speed sensors and six ABS regulating control electromagnetic valves, described main control chip is connected to wheel speed signal processing unit, driving control unit, bus communication unit and memory cell, described six vehicle-wheel speed sensors are all connected with wheel speed signal processing unit, described six ABS regulating control electromagnetic valves are all connected with driving control unit, the wheel speed signal that described main control chip exports for obtaining vehicle-wheel speed sensor, then the slippage rate of wheel is calculated according to the wheel speed signal obtained, according to the slippage rate calculated ABS regulating control electromagnetic valve controlled.
2. a kind of Hexamermis spp ABS system according to claim 1, it is characterized in that: described wheel speed signal processing unit comprises wheel speed signal treatment circuit, described vehicle-wheel speed sensor is connected with wheel speed signal treatment circuit, and described wheel speed signal treatment circuit is connected with main control chip;
Described wheel speed signal treatment circuit comprises voltage comparator circuit and RC low-pass filter circuit, the described mouth of RC low-pass filter circuit is connected with the negative input end of voltage comparator circuit, and the mouth of described vehicle-wheel speed sensor is connected with the input end of RC low-pass filter circuit and the positive input terminal of voltage comparator circuit respectively.
3. a kind of Hexamermis spp ABS system according to claim 2, it is characterized in that: described voltage comparator circuit comprises the first electric capacity, the first resistance, the second resistance, the 3rd resistance and voltage comparator, described RC low-pass filter circuit comprises the 4th resistance, the second electric capacity and the 3rd electric capacity;
One termination first power supply of described first resistance, the other end of described first resistance respectively with one end of the first electric capacity, one end of second resistance and one end of the 4th resistance connect, the other end ground connection of described first electric capacity, the other end of described second resistance is connected with one end of the 3rd resistance and the positive input terminal of voltage comparator respectively, the other end of described 3rd resistance is connected with the mouth of voltage comparator, the other end of described 4th resistance is connected with one end of the second electric capacity and the negative input end of voltage comparator respectively, the other end of described second electric capacity is connected with one end of the 3rd electric capacity, the other end ground connection of described 3rd electric capacity,
The described other end of the first resistance is connected with the mouth of vehicle-wheel speed sensor.
4. a kind of Hexamermis spp ABS system according to claim 3, it is characterized in that: described wheel speed signal treatment circuit also comprises the 5th resistance and the 4th electric capacity, one end of described first electric capacity is connected with one end of the 5th resistance, the other end of described 5th resistance is connected with one end of the 4th electric capacity, the other end ground connection of described 4th electric capacity.
5. a kind of Hexamermis spp ABS system according to any one of claim 1-4, it is characterized in that: described driving control unit comprises drived control chip, described drived control chip is connected with branch road, described branch road comprises the 6th resistance, the 7th resistance and the 5th electric capacity, the control end of described main control chip is connected with the input end of drived control chip, and the mouth of described drived control chip is connected with the control end of ABS regulating control electromagnetic valve and mouth respectively;
The mouth of described drived control chip is also connected with one end of one end of the 5th electric capacity, one end of the 6th resistance and the 7th resistance respectively, the other end ground connection of described 5th electric capacity, another termination second source of described 6th resistance, the described other end of the 7th resistance is connected with the I/O port of main control chip.
6. a kind of Hexamermis spp ABS system according to any one of claim 1-4, it is characterized in that: described bus communication unit is CAN communication unit, described CAN communication unit comprises CAN transceiver interface chip and common mode choke, described CAN transceiver interface chip is connected with main control chip, and described common mode choke comprises the first coil and the second coil; The CANH end of described CAN transceiver interface chip is connected with one end of the first coil, and the CANL end of described CAN transceiver interface chip is connected with one end of the second coil.
7. a kind of Hexamermis spp ABS system according to claim 6, is characterized in that: described CAN communication unit also comprises the 8th resistance, the 9th resistance, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity, the first zener diode, the second zener diode, the 3rd zener diode and the 4th zener diode;
The other end of described first coil is connected with one end of the 8th resistance and one end of the 7th electric capacity respectively, the other end of described 8th resistance is connected with one end of the 3rd power supply, the 9th resistance and one end of the 6th electric capacity respectively, the other end of described 9th resistance is connected with the other end of the second coil and one end of the 8th electric capacity respectively, the equal ground connection of the other end of the other end of described 7th electric capacity, the other end of the 6th electric capacity and the 8th electric capacity;
The other end of described first coil is also connected with the negative pole of the first zener diode, the positive pole of described first zener diode is connected with the positive pole of the second zener diode, the negative earth of described second zener diode, the other end of described second coil is also connected with the negative pole of the 3rd zener diode, the positive pole of described 3rd zener diode is connected with the positive pole of the 4th zener diode, the negative earth of described 4th zener diode.
8. a kind of Hexamermis spp ABS system according to any one of claim 1-4, is characterized in that: it also comprises ASR differential braking valve, described ASR differential braking valve is connected with driving control unit;
Described main control chip comprises RBT ASR module, the wheel speed signal that described RBT ASR module exports for obtaining vehicle-wheel speed sensor, judge whether wheel skids according to the wheel speed signal obtained, then by control ASR differential braking valve the ABS regulating control electromagnetic valve pair drive axle corresponding with the wheel of skidding braked.
9. a kind of Hexamermis spp ABS system according to claim 8, it is characterized in that: described main control chip also comprises EBD functional module, the wheel speed signal that described EBD functional module exports for obtaining vehicle-wheel speed sensor, thus calculate the adhesive ability of each wheel, automatically adjust brake-pressure according to the adhesive ability calculated.
10. a kind of Hexamermis spp ABS system according to claim 8, is characterized in that: described main control chip also comprises TPM functional module and/or hill start supplemental functionality;
The wheel speed signal that described TPM functional module exports for obtaining vehicle-wheel speed sensor, thus calculate the tire rolling radius of wheel, realizes tire pressure monitoring function according to the tire rolling radius calculated;
Described hill start supplemental functionality is used for judging whether to meet assist brake entry condition, when judged result is for being, then controls trailing wheel pressurize, thus prevents vehicle from slipping car.
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