CN106080499A - A kind of active pretension seat belt controlling system - Google Patents
A kind of active pretension seat belt controlling system Download PDFInfo
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- CN106080499A CN106080499A CN201610280407.3A CN201610280407A CN106080499A CN 106080499 A CN106080499 A CN 106080499A CN 201610280407 A CN201610280407 A CN 201610280407A CN 106080499 A CN106080499 A CN 106080499A
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- 238000004891 communication Methods 0.000 claims abstract description 31
- 230000005611 electricity Effects 0.000 claims description 12
- 230000008859 change Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 description 10
- 238000013461 design Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000000875 corresponding effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/34—Belt retractors, e.g. reels
- B60R22/46—Reels with means to tension the belt in an emergency by forced winding up
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R2021/0104—Communication circuits for data transmission
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R2021/01286—Electronic control units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/18—Anchoring devices
- B60R22/195—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type
- B60R2022/1957—Anchoring devices with means to tension the belt in an emergency, e.g. means of the through-anchor or splitted reel type characterised by electric actuators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/48—Control systems, alarms, or interlock systems, for the correct application of the belt or harness
- B60R2022/4808—Sensing means arrangements therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
A kind of active pretension seat belt controlling system, panel includes power circuit, single-chip microcomputer, motor-drive circuit, electromagnetic clutch drive circuit, sensor interface circuitry, communication serial port circuit, BDM download circuit and interface circuit.The present invention is by gathering the signal of each early warning sensor; the logical judgment utilizing singlechip controller determines level of security; and according to the difference of degree of danger; control command under the different level of security of output; motor is driven to control Webbing retractor retracting number of times and the value of thrust of belt-strap; by the integrated mode that both are different, determine corresponding level of security, it is ensured that human pilot is played and reminds and the function of protection.
Description
Technical field
The present invention relates to a kind of active pretension seat belt controlling system.
Background technology
Now, seat belt is as the important component part in member's constrained system, and fact proved is most important
And maximally effective safety device.The security performance of automobile is by predicting and evade danger Accident prevention in the automobile active of possible trouble
Safety and the passive security composition that strick precaution driver and crew come to harm when a fault occurs.Seat belt is mainly used to when automobile runs into
During fortuitous event brake hard, driver and crew are fettered on the seat, thus protect driver and crew to collide from secondary and cause wound
Evil.According to multiple studies have shown that both at home and abroad, the fatigue driving of driver and violation operation are the main causes causing vehicle accident, account for
To vehicle accident sum 75%.By to the detection of driver's driving states and providing relevant information to driver in time, can
To efficiently reduce the generation of vehicle accident.Therefore, the research for seat belt is significant to running safety.Special
Other, for seat belt research in terms of active safety, it is forward-looking and edification.
Traditional three-point safety belt and existing belt with pre-load device belong to the category of passive security, again due to existing
Belt with pre-load device be after collision occurs, just to play purpose and the generation of pretension by built-in exploding gas propellant
Gas-forming agent in collision rift device needs to change in time, it is impossible to meet the requirement of active safety, the most very well
Play that precognition is dangerous, reduce dangerous function also greatly increases rear current cost.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, the present invention provides a kind of active pretension seat belt controlling system, its
By gathering the signal of each early warning sensor, the logical judgment of singlechip controller is utilized to determine level of security, and according to danger
The difference of degree, the control command under the different level of security of output, drive motor control Webbing retractor retracting number of times and
The value of thrust of belt-strap, by the integrated mode that both are different, determines corresponding level of security, it is ensured that play human pilot
To reminding and the function of protection.
As above conceiving, the technical scheme is that a kind of active pretension seat belt controlling system, panel includes electricity
Source circuit, single-chip microcomputer, motor-drive circuit, electromagnetic clutch drive circuit, sensor interface circuitry, communication serial port circuit, BDM
Download circuit and interface circuit；Described power circuit respectively with single-chip microcomputer, motor-drive circuit, electromagnetic clutch drive circuit and
Sensor interface circuitry connects；Described single-chip microcomputer and BDM download circuit be bi-directionally connected and communication serial port circuit and interface circuit double
To communication, the output port of single-chip microcomputer connects motor-drive circuit and electromagnetic clutch drive circuit, the input port of single-chip microcomputer
The output signal of various sensor is received by sensor interface circuitry.
Described power circuit includes power supply input and power supply chip U1；Described power supply inputs successively through electric fuse F1 and two poles
Pipe D1 connects the Vin+ pin of power supply chip U1, and the OUTPUT pin of power supply chip U1 exports through Zener diode D4 and inductance L1
Supply voltage.
16 single-chip microcomputer MC9S12DP256B that described single-chip microcomputer preferred Freescale company produces.
Described motor-drive circuit uses the motor drive ic MC33886 that Motorola Inc. produces, series electrical on it
Current feedback circuit；Described current feedback circuit uses Hall-type current sensor TBC-5PS5, and its outfan is connected with single-chip microcomputer.
Described electromagnetic clutch drive circuit includes DDL-1.2 type electromagnetic clutch, NPN type triode S8050 and relay
Device SRD-05VDC-SL-C, wherein, with electromagnetic clutch after NPN type triode S8050 and relay SRD-05VDC-SL-C series connection
Device connects, and controls the folding of electromagnetic clutch, diode in parallel between relay coil two pins DCLH+ and PGND
1N4007, the base stage pin of NPN type triode S8050 is directly connected with the I/O mouth of single-chip microcomputer, by controlling I/O mouth height electricity
Flat change controls the connecting and disconnecting of electromagnetic clutch.
Cmos voltage transducer LMC7660 chip that described sensor interface circuitry is produced by TI company and amplifier
INA333 connects composition；LMC7660 provides the voltage of-5V for INA333, and the supply voltage making INA333 is+5V and-5V；Amplify
Institute connecting resistance R3 between 1 pin and 8 pins of device INA333.
Described communication serial port circuit uses the MAX232 chip of TI company.
Described interface circuit includes 485 EBIs and CAN communication interface；The chip that 485 EBIs use is
MAX485；CAN communication interface uses the TJA1050 chip of Freescale company.
Reserve A/D interface on described panel to be directly connected with the A/D passage pin of single-chip microcomputer.
The present invention, by gathering the signal of each early warning sensor, utilizes the logical judgment of singlechip controller to determine safe level
Not, and according to the difference of degree of danger, the control command under the different level of security of output, drive motor to control seat belt retracting
Device retracting number of times and the value of thrust of belt-strap, by the integrated mode that both are different, determine corresponding level of security, it is ensured that
Human pilot is played and reminds and the function of protection.
Have the advantages that
1, in terms of power supply, utilize car battery to provide power supply for whole control system, power-switching circuit will store
The 12V voltage of battery is converted to the supply voltage needed for sensor, motor driving and electromagnetic clutch, single-chip microcomputer.
2, in terms of signal input, can each sensor signal of Real-time Collection, simultaneously by arranging corresponding sensor interface
Circuit is for single-chip microcomputer identification.
3, in terms of signal processing logic computing, single-chip microcomputer it is uniformly controlled.
4, in terms of communication, using serial communication circuit, serial ports can control single chip computer and liquid crystal display screen show simultaneously.
5, in terms of driving, by single-chip microcomputer and corresponding peripheral drive circuit drive motor and the operating of electromagnetic clutch and
Break-make.
6, in terms of feedback current, mainly by the electric current of armature and list is fed back to by current sensor Real-time Collection
Sheet machine, the PWM wave voltage exported by regulation is regulated actual current size thus reaches the constant moment of force control to belt-strap
System, electric current controls to use closed loop feedback and fuzzy PI hybrid control.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the present invention；
Fig. 2 is power circuit principle figure of the present invention；
Fig. 3 is BDM download circuit schematic diagram in the present invention；
Fig. 4 is motor-drive circuit schematic diagram in the present invention；
Fig. 5 is current feedback circuit schematic diagram in the present invention；
Fig. 6 is electromagnetic clutch drive circuit schematic diagram in the present invention；
Fig. 7 is sensor interface circuitry schematic diagram in the present invention；
Fig. 8 is key circuit schematic diagram in the present invention.
Detailed description of the invention
The present invention will be described in detail with embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1: a kind of active pretension seat belt controlling system, electricity is driven including power circuit, single-chip microcomputer, motor
Road, electromagnetic clutch drive circuit, sensor interface circuitry, communication serial port circuit, BDM download circuit and interface circuit；Power supply
Circuit is connected with single-chip microcomputer, motor-drive circuit, electromagnetic clutch drive circuit and sensor interface circuitry respectively, for whole master
Dynamic formula pretension safety belt controller system provides applicable, stable power supply.Single-chip microcomputer is responsible for the process of signal and computing and exports
Control signal, is the core of whole controller.Motor-drive circuit is used for driving motor to meet the retracting of actual belt-strap to be wanted
Asking, current feedback circuit is used for the current signal of motor in real time armature and feeds back.Electromagnetic clutch drive circuit is used
In the opening and closing of control electromagnetic clutch, connect, cut off power transmission.Sensor interface circuitry is for carrying out each sensor signal
Process, facilitate single-chip microcomputer to receive and process.Communication serial port circuit, for convenient and microcontroller communication, receives and sends control letter
Number.BDM download circuit is for controlling download and the on-line debugging of program.Interface circuit is connected with controller for all parts
Connect, convenient extension.
As in figure 2 it is shown, described power circuit includes power supply input, power supply chip U1, described power supply inputs successively through power supply
Switch S1, electric fuse F1, diode D1 and Zener diode connect the Vin+ pin of power supply chip U1, power supply chip U1's
OUTPUT pin is through Zener diode D4 and inductance L1 output supply voltage；Due to for vehicle safety tape controller, so power supply
Importation uses the input of accumulator 12V, and 12V power supply enters power supply chip U1, the work of D1 through electric fuse F1 and diode D1
With being to prevent user from power supply connecing the anti-hardware that damages, F1 is that circuit is shielded by the electric fuse of 3A, and power supply chip U1 is excellent
Choosing uses LM2576 conversion chip, and the supply voltage of access can be converted to 5V, D4 is Zener diode, outside LM2576
Enclosing circuit ingredient, inductance L1 is the peripheral circuit building block of LM2576..Also connect between on and off switch S1 and electric fuse F1
It is connected to power supply indicator LED, preferably 12V power supply indicator.Described power circuit also include being connected to Zener diode D2 and
Electric capacity C1, C2 between power supply chip U1, and the electric capacity C3 being connected with supply voltage outfan, electric capacity C1, C2, C3 play surely
Pressure filter action, it is ensured that the stability of 5V voltage output.
Single-chip microcomputer is the core of restraint system control system, assume responsibility for various sensor signal logical operations process and
Send the responsibility of control signal control system normal operation.Produce 16 of singlechip chip of the present invention preferred Freescale company
Single-chip microcomputer, model is MC9S12DP256B, and its minimum system is the minimal configuration system that can make normal circuit operation.It is
Mini system includes: reset circuit, clock circuit, debugging circuit for lamp and BDM download interface circuit.The present invention uses
The standard clock circuit of MC9S12DP256, be for no reason at all external crystal-controlled oscillation of a 16MHz be connected on single-chip microcomputer EXTAL and
On XTAL pin, utilize the phaselocked loop of MC9S12DP256 and voltage controlled oscillator can by this frequency upgrading to 24MHz, as
The internal clocking bus of single-chip microcomputer.It is Low level effective that MC9S12 series monolithic resets, and reset circuit is multiple with single-chip microcomputer here
Position pin is connected and uses the form of microswitch can realize electrification reset and manual key reset, facilitates circuit board function
Debugging.Minimum system circuit adds debugging circuit for lamp, uses light emitting diode to be connected with single-chip processor i/o mouth, use single-chip microcomputer
The level height controlling I/O mouth controls to debug the light on and off of lamp.Debugging circuit for lamp can make minimum system debugging convenient and verify electricity
The fluency that road plate program burn writing success or not and chip run.
The special purpose interface that BDM download circuit is MC9S12DP256B program burn writing, wipes, control, debug, is the most general
Time a kind of debugging interface, be widely used in various singlechip controller, as shown in Figure 3.
MC33886 has been internally integrated H-bridge circuit, and the voltage range of work is that 5V～40V meets safety belt controller work
Voltage and motor driven voltage requirement, have the function of overload protection and error reporting.The effect of motor drive ic is by low
Power, the pwm signal of low-voltage zoom into the high-power pwm signal of 24V, are controlled direct current generator, drive motor rotation.
By the control to PWM ripple dutycycle, it is possible to achieve the rotating of motor and the regulation of velocity of rotation and the actual output of motor
The size of moment of torsion, it is substantially to be controlled by armature sense of current and size.Meet intelligent prefastening
Seat belt real work requirement, it is achieved seat belt drives rotating and the regulation of Motor torque of motor, it is thus possible to realize not
With regulation to harness tension size under level of security.The motor that described motor-drive circuit is produced by Motorola Inc. drives
Dynamic chip MC33886 and its peripheral circuit form, as shown in Figure 4.
Owing to control to approximate to the permanent moment of torsion of motor regards as by the constant current controlling of armature, therefore want
Current of electric is carried out Real-time Collection, causes current direction to change it is also contemplated that motor steering is rotating, therefore current feedback
Circuit is preferably the current sensor of Hall-type, and model is TBC-5PS5, and sample rate current is 5A, and sensor internal carries sampling electricity
Resistance, chip output for voltage, directly and the ADC pin of single-chip microcomputer, current sensor is connected on motor and drives outfan 1 pin
On galvanic electricity road.Current feedback circuit is as shown in Figure 5.
Electromagnetic clutch drive circuit transmits intermediary as the power of motor and Webbing retractor, wants when real work
Ask and operate with motor simultaneously, i.e. connect electromagnetic clutch while electric machine rotation to drive coiler operating.The DDL-1.2 selected
The rated voltage of type electromagnetic force clutch is 24V, and the present invention utilizes NPN type triode S8050 and relay SRD-05VDC-SL-C
Realize on-off action, control the folding of electromagnetic clutch.Because its magnetic induction coil switching can produce during electromagnetic clutch folding
Inverse electromotive force, therefore diode 1N4007 in parallel between relay coil two pins DCLH+ and PGND, eliminates effectively
The inverse electromotive force impact on circuit, it is ensured that the reliable and stable operation of circuit.The base stage pin of S8050 is direct and single-chip microcomputer
I/O mouth is connected, and controls the connecting and disconnecting of electromagnetic clutch by controlling the change of I/O mouth low and high level, play transmission and
Cut off the effect of motor power output, it is ensured that seat belt furling system can be properly functioning.Electromagnetic clutch drive circuit such as Fig. 6
Shown in.
Being usually analog quantity due to the amount of sensor output and numerical value is less, the effect of sensor interface circuitry is typically will
Sensor acquisition to analog quantity be converted to the range of voltage values that single-chip microcomputer can identify.The voltage that MC9S12DP256AD gathers
Scope is 0～5V, so each sensor signal to be amplified.
The maximum range of brake pedal force sensor is 670N, when 10V powers the range of signal of Full-span output be 0～
20mv.Restriction due to power supply, it is considered to power brake pedal force sensor with 5V, now the range of signal of Full-span output is
0～10mv, in order to simplify calculating during A/D conversion, it is contemplated that the voltage amplification 500 of 10mv is reached 0～5V again.
What the present invention selected is that the INA333 of TI company tentatively amplifies, and INA333 is that a kind of low-power consumption precision instrument is put
Big device, has good accuracy.According to the value difference of institute connecting resistance R3 between 1 pin and 8 pins can by signal amplify 0～
1000 times, by consulting chip PDF, when R3 is 200 Ω resistance, the amplification of chip is 500 times, meets design in theory
Requirement.Emulating with the carrying out of the simulation software TINA of TI company, input uses the voltage signal of 10mv, and reference resistance is 200 Ω
Resistance, meet the needs of the amplification 500 times of actual requirement.
But during circuit board hardware test is debugged, find this actual times magnification of single scaling circuit
Number can not meet far away the amplification requirement of 500 times, through investigation and further test, has selected and has been all what TI company produced
LMC7660 chip uses with INA333 simultaneously.LMC7660 is a cmos voltage transducer, it is possible to by the positive electricity of 10V～1.5V
Pressure is converted to the negative voltage of-1.5V～-10V, in operating temperature and voltage range, it is not necessary to external diode, has low static state
The feature of electric current high-conversion rate.The effect of LMC7660 mainly provides the voltage of-5V for INA333, make in INA333 7 pins and
Voltage between 4 pins is respectively+5V and-5V, now the voltage reference of chip be the supply voltage of 0V, i.e. INA333 be+5V
With-5V, farthest reducing the bias impact on INA333, actual measurement meets the requirement amplifying 500 times, circuit theory
Figure is as shown in Figure 7.
The present invention uses serial communication to realize the communication of safety belt controller and host computer.Communication serial port circuit uses
The MAX232 chip of TI company, MAX232 running voltage is 5V, and effect is to realize single-chip microcomputer Transistor-Transistor Logic level and computer 232 level
Between conversion thus reach the purpose with upper machine communication, interface uses BD9 interface.Serial ports is utilized to help on host computer
Hands, by directly completing related command by control single chip computer with the connection of 232 interfaces, it is achieved that the merit of upper computer software emulation
Energy.
Multiple interfaces circuit is to meet controller and each peripheral components consolidates the parts of connection, and the interface of the present invention has motor
Drive interface, the driving interface of clutch, ultrasonic sensor interface, brake pedal force sensor interface, liquid crystal display screen external
Interface, various interfaces determine encapsulation and type all in accordance with pcb board size.Owing to the data transmit-receive pin of MC9S12DP256 is limited,
So have employed the mode connected by method selection 232 or 485 bus of jump cap short circuit, switching ultrasonic sensor and liquid crystal display screen
Show state accordingly.
For meet controller debugging and with each interface, the compatibility of bus, the present invention is reserved when board design
485 EBIs and CAN communication interface, facilitate debugging and the real train test in later stage.RS485 bus is a kind of common
Serial bus standard, uses balance to send the mode accepted with difference, therefore has the ability of suppression common mode disturbances, actual communication
Distance can reach about 3000 meters, also has a wide range of applications in the work system of multinode.The core that 485 bus communications use
Sheet is MAX485, primarily serves Transistor-Transistor Logic level and the transduction of 485 protocol requirement level.
Increasing and information transfer rate required more and more higher along with Hyundai Motor electronic control system and communication system,
Automobile CAN-bus has been widely applied in the middle of Hyundai Motor electronic control system at present.CAN is as a kind of on-the-spot total
In the shared bus that line energy is real-time, the information data of each node realizes synchronous transfer, solves the wiring of orthodox car electric-control system multiple
Miscellaneous take a large amount of interior space, the problem that speed is slow, be not easy to maintenance is shared in information transmission.On communication speed, CAN is made
For high-speed bus, the maximum speed of communication can reach 1MB/s, substantially increases the communication speed of data and information, it is achieved that each
The Real-Time Sharing of nodal information.In order to meet the extension needs of multiplex roles, the active pretension seat belt of present invention design controls
2 CAN data-interfaces reserved by device, use the TJA1050 chip of Freescale company, and the 1 of chip, 4 pins divide
It is not connected with the CAN communication passage pin on single-chip microcomputer.
In terms of the selection of early warning sensor, the present invention has only selected pressure transducer and ultrasonic sensor sensor.
But intelligent driving safety system is it is desirable that gather the signal of various sensor, carries out comprehensive logical judgment in ECU
There is provided and ensure best security performance.On the controller board of present invention design, spy has reserved A/D interface, direct and single-chip microcomputer
A/D passage pin be connected, when facilitating subsequent development to design add multiple sensor signal.
The active pretension seat belt of present invention design determines three level of securitys, in different peaces on control strategy
Under full rank, single-chip microcomputer sends different control signals and drives motor to complete corresponding action.When reality controls, use upper
Machine serial communication controls, liquid crystal display screen touch control, and software flow controls, and hardware button Non-follow control different control methods, side
Just observe and test, therefore adding key circuit when controller designs, facilitating manual simulation hardware and debugging.Such as Fig. 8 institute
Show.
Embodiment described above only have expressed embodiments of the present invention, and it describes more concrete and detailed, but can not
Therefore the restriction to the scope of the claims of the present invention it is interpreted as, as long as using the skill that the form of equivalent or equivalent transformation is obtained
Art scheme, all should fall within the scope and spirit of the invention.
Claims (9)
1. an active pretension seat belt controlling system, it is characterised in that panel includes power circuit, single-chip microcomputer, motor
Drive circuit, electromagnetic clutch drive circuit, sensor interface circuitry, communication serial port circuit, BDM download circuit and interface electricity
Road；Described power circuit is respectively with single-chip microcomputer, motor-drive circuit, electromagnetic clutch drive circuit and sensor interface circuitry even
Connect；Described single-chip microcomputer and BDM download circuit are bi-directionally connected and communication serial port circuit and interface circuit both-way communication, single-chip microcomputer
Output port connects motor-drive circuit and electromagnetic clutch drive circuit, and the input port of single-chip microcomputer is by sensor interface electricity
Road receives the output signal of various sensors.
Active pretension seat belt controlling system the most according to claim 1, it is characterised in that: described power circuit includes
Power supply input and power supply chip U1；The input of described power supply connects the Vin+ of power supply chip U1 successively through electric fuse F1 and diode D1
Pin, the OUTPUT pin of power supply chip U1 is through Zener diode D4 and inductance L1 output supply voltage.
Active pretension seat belt controlling system the most according to claim 1, it is characterised in that: described single-chip microcomputer preferably flies
Think 16 single-chip microcomputer MC9S12DP256B that karr company produces.
Active pretension seat belt controlling system the most according to claim 1, it is characterised in that: described motor-drive circuit
Use the motor drive ic MC33886 that Motorola Inc. produces, series current feedback circuit on it；Described current feedback electricity
Road uses Hall-type current sensor TBC-5PS5, and its outfan is connected with single-chip microcomputer.
Active pretension seat belt controlling system the most according to claim 1, it is characterised in that: described electromagnetic clutch drives
Galvanic electricity road includes DDL-1.2 type electromagnetic clutch, NPN type triode S8050 and relay SRD-05VDC-SL-C, wherein, NPN
It is connected with electromagnetic clutch after type audion S8050 and relay SRD-05VDC-SL-C series connection, controls opening of electromagnetic clutch
Close, diode 1N4007 in parallel, the base stage of NPN type triode S8050 between relay coil two pins DCLH+ and PGND
Pin is directly connected with the I/O mouth of single-chip microcomputer, controls the connection of electromagnetic clutch by controlling the change of I/O mouth low and high level
With disconnection.
Active pretension seat belt controlling system the most according to claim 1, it is characterised in that: described sensor interface electricity
The cmos voltage transducer LMC7660 chip that route TI company produces is connected composition with amplifier INA333；LMC7660 is
INA333 provides the voltage of-5V, and the supply voltage making INA333 is+5V and-5V；1 pin of amplifier INA333 and 8 pins it
Between institute connecting resistance R3.
Active pretension seat belt controlling system the most according to claim 1, it is characterised in that: described communication serial port circuit
Use the MAX232 chip of TI company.
Active pretension seat belt controlling system the most according to claim 1, it is characterised in that: described interface circuit includes
485 EBIs and CAN communication interface；The chip that 485 EBIs use is MAX485；CAN communication interface is adopted
Be the TJA1050 chip of Freescale company.
Active pretension seat belt controlling system the most according to claim 1, it is characterised in that: reserved on described panel
A/D interface is directly connected with the A/D passage pin of single-chip microcomputer.
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| CN201610280407.3A CN106080499A (en) | 2016-04-28 | 2016-04-28 | A kind of active pretension seat belt controlling system |
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| CN107554479A (en) * | 2017-09-11 | 2018-01-09 | 王记 | A kind of car belt ribbon limiter lockable mechanism and its control system |
| CN107786076A (en) * | 2017-11-22 | 2018-03-09 | 杭州高品自动化设备有限公司 | Microprocessor control system and its control method |
| CN110733458A (en) * | 2018-07-18 | 2020-01-31 | 丰田自动车株式会社 | Seat belt control device |
| CN111284444A (en) * | 2018-12-07 | 2020-06-16 | 现代自动车株式会社 | Vehicle, control method thereof, and seatbelt apparatus |
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