CN101365276A - Adaptive front lamp set control system based on network technique and controlling method thereof - Google Patents
Adaptive front lamp set control system based on network technique and controlling method thereof Download PDFInfo
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Abstract
The invention discloses an adaptive frontlighting system (AFS) based on internet technology. The system comprises an AFS controller, a vehicle body sensor and an actuating mechanism. The AFS controller consists of an MCU module which is connected to a power management module and a CAN transceiver module through an SPI bus line, and a signal regulating circuit which is connected to the MCU module through voltage quantity and PWM waveform. The signal regulating circuit comprises a steering wheel angle, a speed and suspension height signal input regulating circuit, and a stepper motor control module which is connected with the MCU module through an IIC bus line. The vehicle body sensor consists of a steering wheel angle sensor which is connected with a steering wheel angle signal input regulating circuit, a speed sensor which is connected with a speed signal input regulating circuit, and a front and a back suspension height sensors which are respectively connected with a suspension height signal input regulating circuit.. The actuating mechanism comprises a vertical regulating actuator and a horizontal turning actuator which are respectively connected with the AFS controller. The AFS controller is connected with a vehicle body network through CAN/ LIN. Meanwhile, the invention further discloses a control method using the AFS control system.
Description
Technical field
The present invention relates to a kind of self adaptation and regulate the control system of car headlamp range of exposures, relate in particular to headlamp self-adaption regulation system during negotiation of bends at a kind of night.
Background technology
Automotive lighting plays an important role to traffic safety.Effective road lighting under various different conditions, purpose are not only the vision that strengthens the people, and be most important and what must consider is that bright degree, color and third dimension will be arranged, shape and action in addition simultaneously, and brightness and color contrast.Car light before and after high-performance headlamp and other is an elementary object of realizing the automotive lighting of " visible and seen ".
A plurality of stages have been experienced in the development of car headlamp system: develop into incandescent lamp from initial kerosene lamp; Develop into parabolic halogen tungsten headlamp, free form surface halogen tungsten headlamp and projection system headlamp then; It is the optical projection system headlamp and the free form surface head lamp system of light source with the gaseous discharge lamp that middle nineteen nineties in last century has occurred.Each developing stage of car headlamp system is all containing the continuous pursuit to traffic safety.
As everyone knows,, can only be operated under a kind of fixing pattern, but actual road behaviour in service, environmental aspect, climate condition or the like situation is very complicated as the dipped beam of traditional driving lamp.Such as the many die Dorfstrasses in: fork in the road, bend situation, crossing turning situation, drive on the expressway, driving, misty rain weather etc. on national highway.The also road environment of this complexity and weather conditions just make traffic safety still have huge hidden danger.Statistics shows, require and the higher country of driveship at those vehicle operating specifications of Europe, vehicle safety, since the illumination cause traffic accident (if promptly by day or lighting condition well complete avoidable traffic accident) reach more than 30%, the loss that causes is well imagined.Add that the vehicle that on the way travels is increasing, old driver increase and allow that prolongation (age to 70 year old is driven in European existing permission, and the elderly's eyesight and reaction speed obviously descend) that the driver drives the age or the like is all multifactorly makes that the traffic safety problem is more outstanding.
Under the requirement of these conditions, AFS system (that is: adaptive front lighting lamp system) arises at the historic moment.It has significantly improved in vehicle forward direction, the visuality at the intersection in the place ahead, bend place during night running; Reduce the degree of fatigue of detour driving at night effectively, thereby obviously promote the fail safe of detour up train at night.Vehicle is when negotiation of bends, and the illumination zone and the illumination distances that can enlarge markedly dipped headlights opened by the AFS system, increases driver's reaction time, and this point is most important for the professional driver who carries out the transportation at night often.
In the prior art, about the AFS system research is arranged also, open day is on October 10th, 2007, and publication number is to disclose a kind of " self-adaptive control device for head light of auto car " in the Chinese invention patent application of CN101049808A, and this device belongs to non-portable illumination device field.Its technical scheme that is achieved is to comprise central control unit and drive performance element, is provided with the LIN bus transceiver between central control unit and driving performance element; Between driving performance element stepping motor and central control unit master MCU chip, be provided with the position feedback module; Central control unit is connected by the LIN bus with the driving performance element.Its weak point of this technical scheme is: (1) separates central control unit and driving performance element, and the middle LIN of use bus connects, and has increased the complexity of system, and the reliability of this system also descends thereupon; (2) because central control unit and drive the topological structure that splits of performance element, it drives performance element except the transceiver that the LIN bus will be arranged, also must have MCU as the control of LIN bus from node, increased the cost of system; (3) light element is the vitals of vehicle safety travel, also is consumable accessory simultaneously.The prior art adopts the design with LIN transceiver and driver element integration, in case driver element damages, then the LIN receiver will be changed all over, thereby has increased maintenance cost.
Summary of the invention
The adaptive front lighting lamp system control system and the control method thereof that the purpose of this invention is to provide a kind of technology Network Based, through the integration of a plurality of electric appliance units be need not to add transceiver, and can utilize original CAN network and need not to install additional extra transducer, simplified system configuration, improve the reliability of AFS control system, reduced the production and the maintenance cost of system simultaneously.Also designed different signal input conditioning module in the native system, increased the signals collecting accuracy and the stability of system at the vehicle sensors of non-CAN network.
In order to solve the problems of the technologies described above, the present invention is based on the technical scheme that the adaptive front lighting lamp system control system of network technology is achieved is: this system comprises AFS controller, vehicle body transducer and actuator, and described AFS controller comprises: the MCU module that is connected with power management and CAN transceiver module by spi bus; By the signal conditioning circuit that voltage and PWM waveform are connected with described MCU module, described signal conditioning circuit comprises steering wheel angle signal input modulate circuit, vehicle speed signal input modulate circuit and suspension altitude signal input modulate circuit; The step motor control module that is connected with the MCU module by iic bus; Described vehicle body transducer comprises the steering wheel angle sensor that is connected with steering wheel angle signal input modulate circuit, imports vehicle speed sensor that modulate circuit is connected, imports front suspension height sensor and the rear suspension height sensor that modulate circuit is connected with the suspension altitude signal respectively with vehicle speed signal; Described actuator comprises vertical adjustment actuator and the horizontal rotation actuator that is connected with the AFS controller respectively; Described AFS controller is by CAN/LIN and vehicle body net connection.
Utilize the method for said system control front car light may further comprise the steps:
(1) starts the adaptive front lighting lamp system control system;
(2) the MCU module is carried out variable-definition and initialization thereof;
(3) setting of the initialization of ancillary equipment and state thereof comprises the CAN communication control module is set, and expands the operating state that communication module is provided with power management module MC33889 by SPI, and the operating state of step motor control module etc. is set by iic bus;
(4) the CAN bus transceiver among the power management module MC33889 carries out the reception of CAN information and order;
(5) the AFS controller carries out following control according to the dipped beam state and the reversing state of the vehicle that receives by the vehicle body transducer: during the dipped beam state: judge whether dipped headlights is opened, if dipped headlights is in closed condition, this moment, the adaptive front lighting lamp system control system was closed automatically, and returned step (4); If dipped headlights is in opening, judge whether the adaptive front lighting lamp system control system is in opening, if the adaptive front lighting lamp system control system is in opening, order is carried out next step; Otherwise, return step (4); During the reversing state: judge whether vehicle is in the cruising state, if vehicle is in the cruising state, open the adaptive front lighting lamp system control system this moment, order is carried out next step; If vehicle is in the reversing state, this moment, the AFS system quit work, and kept front illumination, returned step (4);
(6) signal of vehicle body transducer carries out the coupling of filtering and voltage by signal conditioning circuit, and the MCU module comes from the information of vehicle body transducer by self AD and the collection of PWM interface, and handles this information;
(7) calculate the drift angle of front car light by following formula by the MCU module:
Wherein: L---vehicle wheelbase; α---steering wheel angle; φ---car light drift angle; K---steering characteristic coefficient; V---speed of a motor vehicle function; T---shift to an earlier date lighting hours;
(8) the MCU module is sent to the step motor control module by iic bus with control command, rotates with the stepping motor that drives in vertical adjustment actuator and the horizontal rotation actuator, thereby makes front car light reach best illuminating effect;
(9) return above-mentioned steps (4), continue self adaptation and adjust front car light system.
Compared with prior art, the invention has the beneficial effects as follows:
(1) owing in the present invention is based on the adaptive front lighting lamp system control system of network technology, the MCU module (central control module) of AFS controller and the driver element of stepping motor are integrated into a control unit.Therefore, this system configuration is compared with the technical scheme of prior art and is more simplified.That is: the control unit of this integration adopts iic bus control, and this iic bus can use general purpose I/O simulation, need not to add transceiver, and general MCU can use, and this can significantly reduce the cost of system undoubtedly.
(2) in the control system of the present invention, also in the AFS controller, increased powerful CAN line interface, improved the autgmentability and the controllability of system,, entered existing CAN network on the car to make things convenient for the AFS controller better to merge for the car load network architecture provides interface.For vehicle with CAN network, can directly obtain various sensor signal data, and need not to install additional extra transducer from the CAN line, greatly reduce system complexity and cost.
(3) for the vehicle that does not have the CAN network, control system of the present invention has also proposed different signal input conditioning module at special sensor design, has increased the signals collecting accuracy and the stability of system.
Description of drawings
Fig. 1 is the hardware block diagram that the present invention is based on the adaptive front lighting lamp system control system of network technology;
Fig. 2 is the hardware block diagram of AFS controller in the control system of the present invention;
Fig. 3 is steering wheel angle signal input modulate circuit figure in the control system of the present invention;
Fig. 4 is the relative position signal graph of steering wheel angle signal input modulate circuit in the prior art;
Fig. 5 is the absolute position signal figure of steering wheel angle signal input modulate circuit in the prior art;
Fig. 6 is vehicle speed signal input modulate circuit figure in the control system of the present invention;
Fig. 7-the 1st, front suspension altitude signal input modulate circuit figure in the control system of the present invention;
Fig. 7-the 2nd, rear suspension altitude signal input modulate circuit figure in the control system of the present invention;
Fig. 8 is an AFS controller main flow chart in the control system of the present invention;
Fig. 9 is CAN information frame in the control system of the present invention;
Figure 10 is a steering wheel angle data format in the control system of the present invention;
Figure 11 is a fore suspension and rear suspension altitude information structure in the control system of the present invention;
Figure 12 is the data structure of the control byte of AFS controller in the control system of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done and to describe in further detail.
Fig. 1 shows the hardware block diagram of the adaptive front lighting lamp system control system that the present invention is based on network technology, Fig. 2 shows the hardware configuration of the AFS controller in this system, as shown in Figure 1, this system comprises AFS controller 100, vehicle body transducer 200 and actuator 300.This system can calculate and judges according to the composite factors such as operating state of the operating characteristics of the dynamic change of vehicle body, steering mechanism, engine, thereby judges transport condition that automobile is current and dim head lights is adjusted accordingly.As shown in Figure 2, described vehicle body transducer 200 comprises the steering wheel angle sensor 201 that is connected with steering wheel angle signal input modulate circuit, imports vehicle speed sensor 202 that modulate circuit is connected, imports front suspension height sensor 203 and the rear suspension height sensor 204 that modulate circuit is connected with the suspension altitude signal respectively with vehicle speed signal.The actuator 300 of AFS system comprises vertical adjustment actuator and the horizontal rotation actuator that is connected with AFS controller 100 respectively; Actuator uses two stepping motors to carry out the angle adjustment of level, vertical direction.Gather steering wheel angle signal, the speed of a motor vehicle and overall height signal by the AFS controller; Draw corresponding horizontal, vertical drift angle by built-in Mathematical Modeling; Rotate by the driver drives stepping motor at last, reach best illuminating effect.Adopt stepping motor to have characteristics such as stroke is accurate, stable action, long working life.
Describe the formation and the operation principle of each module in the control system of the present invention below in detail:
1.AFS the formation of controller 100: AFS controller 100 is key components of AFS system.It is responsible for collection, the processing of sensor signal, the realization of control strategy, and Stepping Motor Control, CAN network service.As shown in Figure 2, described AFS controller 100 comprises: the MCU module 102 that is connected with power management and CAN transceiver module 101 by spi bus; By the signal conditioning circuit 103 that voltage and PWM waveform are connected with described MCU module 102, described signal conditioning circuit 103 comprises steering wheel angle signal input modulate circuit, vehicle speed signal input modulate circuit and suspension altitude signal input modulate circuit; The step motor control module 104 that is connected with MCU module 102 by iic bus.Described AFS controller 100 is by CAN/LIN and vehicle body net connection.
2. power management and CAN transceiver module 101
As shown in Figure 2, the chip MC33889 that described power management and CAN transceiver module 101 adopt motorola inc to produce, the CAN bus transceiver of also built-in low speed fault tolerant when it has power management function.
Because the power-supply system of automobile use at present is the 12V system normally, the voltage range of storage battery is generally 9～15V.And the maximum input voltage of the input voltage of general single-chip microcomputer and each pin is 5V.Because the electrical appliance module on the vehicle is more and more many, power consumption also constantly rises simultaneously, and the quiescent dissipation of system requires strict day by day.Therefore, in controller, need a power management module to satisfy the conversion of supply voltage and the requirement of quiescent dissipation management.
The MC33889 that selects for use among the present invention, its operating voltage 9V-27V can resist the peak voltage of maximum 40V; Two kinds of powering modes are available, under extended mode, can obtain minimum 200mA, the driving force of maximum 2A; Have four kinds of powder source management modes: standard, wait for, stop, sleeping and debugging mode comparatively easily; External switch arousal function (drive current of 150mA is provided); Low-voltage, excess temperature detect and protection, built-in house dog; Interrupt requests when having external reset and abnormal conditions; Pass through the communication of SPI mode with ECU, save I/O mouth resource.It can satisfy the requirement of power management fully.
Its CAN transceiver meets ISO 11519CAN standard, and its electric property and MC33388 are complementary.Described CAN communication module mainly comprises MSCAN08 controller and CAN bus transceiver; Described MSCAN08 controller is the CAN controller that motorola inc aims at its 8 and 16 series monolithic customizations, and this controller is supported CAN2.0B.The CAN network belongs to low speed CAN in the vehicle body network that the present invention was suitable for, and the figure place rate is made as 125kbps.
When power management chip MC33889 and MCU module were passed through the communication of SPI mode, the MCU module should be elected host mode as, and MC33889 is defaulted as slave mode; When beginning to transmit data, should make the CSB step-down earlier, and it is low remaining the CSB signal in a secondary data (byte) transport process, after the data transmission is finished, the CSB signal is uprised, after this repeat said process again and transmit next data, and the time that drags down the CSB signal to decide according to the set frequency of main frame SCLK; After powering on, will at first carry out initialization, otherwise expansion of power supply V2 can't operate as normal to the MC33889 chip.
3.MCU module 102
As shown in Figure 2, described MCU module 102 adopts R8C21237, and it is low-power consumption, high performance 8 8-digit microcontrollers that Renesas produces.Peripheral hardware comprises oscillator on 8 multi-functional timers, 16 bit timing devices, UART/ clock synchronization serial line interface, voltage detecting circuit, electrify restoration circuit, the high/low speed sheet, detects timer etc. on the standard film.Having added UART, iic bus interface (IIC)/chip simultaneously selects clock synchronization serial line interface, 10 A/D converters and vibration to stop measuring ability.Be equipped with hardware LIN module and CAN module.Maximum operating frequency is 20MHz.Provide 48 pin package to have abundant I/O resource and embedded data flash memory (1KB * 2 piece) simultaneously.
The AFS controller mainly utilizes the timer with output comparing function of this controller, general purpose timer, 8 path 10 position A/D conversion, CAN communication controler and SPI expansion communication module and iic bus interface.Wherein, general purpose timer is mainly used to regularly be MCU module and the clear dog of power management module; Multichannel 10 A/D converters are used for carrying out the sampling of sensor voltage data; The major function of CAN communication controler be with power management module MC33889 in the CAN transceiver interface, the two is in conjunction with conditioning and the transmission-receiving function of finishing the CAN signal jointly.SPI module and power management module MC33889 communication are carried out initialization to it, the register setting of CAN transceiver, operations such as clear house dog register.The iic bus interface is used for the communication of MCU module and step motor control module.
4. the step motor control module 104
As depicted in figs. 1 and 2, described vertical adjustment actuator comprises that left lamp vertically adjusts the vertical stepping motor of adjusting with right lamp of stepping motor, described horizontal rotation is adjusted actuator and is comprised left lamp horizontal adjusting stepping motor and right lamp horizontal adjusting stepping motor, and above-mentioned a plurality of stepping motors are used for the level of headlight and the angle adjustment of vertical direction;
As shown in Figure 2, the chip AMI30622 that step motor control module 104 adopts AMIS company to produce has comprised the positioner of stepping motor and has controlled diagnose interface that control is by the IIC interface on it.The step motor control module be iic bus from node, the MCU module is a host node.Its stepping motor segmentation micro-stepping is optional: 1/2,1/4,1/8,1/16; Hyporesonance noise with polar region; Programmable output driving current, maximum can reach 800mA; The wide region input voltage can reach 8V-29V; Has overcurrent protection, over voltage alarm and overtemperature alarm and automatically shut down function.
The host node of MCU module 102 relies on different address sections that 4 stepping motors are controlled respectively from node.By iic bus stepper motor driven rated current can be set, maximum output current, key parameters such as holding current and maximum and minimum speed and acceleration.
5. signal conditioning circuit 103
As shown in Figure 2, described signal conditioning circuit 103 comprises steering wheel angle signal input modulate circuit, vehicle speed signal input modulate circuit and suspension altitude signal input modulate circuit; Described vehicle body transducer 200 comprises the steering wheel angle sensor 201 that is connected with steering wheel angle signal input modulate circuit, imports vehicle speed sensor 202 that modulate circuit is connected, imports front suspension height sensor 203 and the rear suspension height sensor 204 that modulate circuit is connected with the suspension altitude signal respectively with vehicle speed signal.
The input signal of the AFS controller 100 among the present invention is various, and the signal of steering wheel angle sensor 201 is arranged, forward and backward suspension transducer 203 and 204 altitude signal and vehicle speed signal of vehicle speed sensor 202 etc.These voltage of signals and processing mode are had nothing in common with each other, and need special-purpose signal conditioning circuit 103 to be translated into the voltage signal that MCU module 102 can be gathered.Below respectively above-mentioned three kinds of Signal Processing circuit are elaborated.
5-1. steering wheel angle signal input modulate circuit
The SX4300A type transducer that the steering wheel angle sensor that uses among the present invention is produced as BI company.Its corner is output as 3 the tunnel, is respectively P1, P2 and P3.It three the tunnel all is the voltage-type signal, and voltage range is 0-5V, is powered by power management module.P1 and P2's is that the relative position signal is exported, and its relation is consulted Fig. 3; P3 is an absolute position signal, and the relation of its voltage and angle is consulted Fig. 4; According to above-mentioned output signal characteristics, the stability of its voltage has determined the accuracy that corner is gathered, and has designed steering wheel angle signal input modulate circuit as shown in Figure 5 thus.Described steering wheel angle signal input modulate circuit comprises the low-frequency disturbance capacitor C 1 that is used on the trap signal, constitute the resistance R 3 and the resistance R 4 of potential-divider network and be used for the capacitor C 2 of the High-frequency Interference on the trap signal; One end of described capacitor C 1 is connected other end ground connection with described steering wheel angle sensor 201; Resistance R 1 one ends of potential-divider network are connected with steering wheel angle sensor 201, and the other end is connected with resistance R 3, the other end ground connection of resistance R 3, and described resistance R 3 is also in parallel with capacitor C 2, and an end of capacitor C 2 is connected with the input signal AD0 of MCU module 102.
Above-mentioned three tunnel signal separation process have adopted same treatment circuit, and in conjunction with Fig. 5, getting P1 is the example explanation.First capacitor C 1 mainly is the low-frequency disturbance on the trap signal; Two resistance R 1 and R3 form potential-divider network, and the input impedance that has improved signal end has reduced the transducer quiescent current; Second capacitor C 2 is mainly used in the High-frequency Interference on the trap signal.After having adopted this modulate circuit, the signal burr is removed, and has improved signal stabilization, and quiescent dissipation has obtained reduction simultaneously, satisfies the design needs fully.
5-2. vehicle speed signal input modulate circuit
Vehicle speed signal is an impulse form, and the frequency of its pulse is directly proportional with the speed of a motor vehicle, and frequency range and amplitude are different because of vehicle.Therefore vehicle speed signal input modulate circuit adopts difference form, its circuit as shown in Figure 6, described vehicle speed signal input modulate circuit adopts difference form, its formation is: resistance R 7 one ends are connected with vehicle speed sensor 202, other end ground connection; Described resistance R 7 also is connected with a resistance R 8, and the other end of resistance R 8 is connected with the positive input of an operational amplifier LM358; Also comprise a resistance R 9, the one end is connected with+12V power supply, and the other end is connected the other end ground connection of resistance R 10 with the negative input of above-mentioned operational amplifier LM358 and an end of resistance R 10 respectively; One resistance R 11 is connected with the output of above-mentioned operational amplifier LM358, and the other end is connected with the input of photoelectrical coupler L/P, and the output of described photoelectrical coupler L/P is connected with the input signal PWM0 of resistance R 12 and described MCU module 102 respectively; The other end of resistance R 12 is connected with+5V power supply.
Utilize two resistance R 9 and R10 to set the threshold value of input, will disturb with clutter and remove.Signal after the filtration enters the input capture unit of MCU module 102 through optical coupler L/P, measures its frequency, and then draws the speed of a motor vehicle by conversion.Optical coupler L/P has mainly played the effect of isolating interference and level conversion.Because the vehicle speed signal pulse amplitude that the present invention can use vehicle is 10V, therefore to set the threshold value of input be 8V for two resistance R 9 and R10, can finely must filter like this and disturb and clutter.After the optocoupler conversion, become the 5V pulse, the input capture unit of input MCU module.
5-3. suspension altitude signal input modulate circuit
Suspension height sensor has two, is installed in respectively on the forward and backward suspension, and it is output as magnitude of voltage, and scope is 0-12V.Because MCU module 102 can only be gathered the voltage of 0-5V, therefore need a bleeder circuit, finish the conversion of voltage range.Front suspension height modulate circuit among the present invention is the same with the structure of rear suspension height modulate circuit, shown in Fig. 7-1 and Fig. 7-2, includes the potential-divider network that is made of two resistance, and this circuit can meet the demands fully.
With the front suspension altitude signal is example, shown in Fig. 7-1, described front suspension height modulate circuit comprises: after resistance R 13 and resistance R 15 series connection, one end is connected with the front suspension height sensor, other end ground connection, wherein resistance R 15 also is parallel with a capacitor C 7, and an end of described capacitor C 7 is connected with MCU module input signal AD4.Constitute potential-divider network by resistance R 13 and resistance R 15, the voltage of exporting on AD4 is 0.4 times of input voltage.Can be that 0-4.8V is to satisfy the requirement that MCU module 102 is gathered with 0-12V voltage scaling.
6.AFS the network communication control flow and the network communication of controller
AFS controller Control Software is by the C language development, through Renesas company provide at the C compiler compiling link of MCU module after generate the HEX binary file, download in the MCU module 102 in the native system.Its control flow as shown in Figure 8.
The present invention is based on the AFS controller of CAN network, and its control and acquisition function can be realized by the CAN network.For vehicle with CAN network, can directly obtain various sensor signal data from the CAN line, need not to install additional extra transducer.Can realize the opening and closing control of AFS module obtaining vehicle body state information etc. by the CAN network.On the onboard system that the CAN network is arranged, sensing data also can pass through the CAN bus transfer, and the acquisition function in the AFS controller just can save like this, reduces system cost.
Be illustrated with the example of a CAN information frame in conjunction with Fig. 9 to Figure 12:
As shown in Figure 9, use the CAN Extended Superframe Format among the present invention, the data number is 8.Data 0 are the steering wheel angle angle with data 1, and data 2 are the speed of a motor vehicle with data 3, and data 4 are the fore suspension and rear suspension altitude information with data 5, and final data 6 is a control byte with data 7.
The steering wheel angle data format as shown in figure 10, wherein: the direction of direction bit representation corner data, just steering wheel angle is clockwise angle or counterclockwise angle.This position is 0 expression clockwise angle, is the counterclockwise angle of 1 expression.Remaining 15 is data bit, the data area 0-32767 of expression.The data of the speed of a motor vehicle are made up of data 2 and data 3, and data 2 are the most-significant byte number, and data 3 are the least-significant byte number.
Fore suspension and rear suspension altitude information structure as shown in figure 11, wherein: data 4 expression front suspension altitude informations, data 5 expression rear suspension altitude informations.Bit 0 bit representation suspension height is with respect to the relation of horizontal level.When this position was 0, the suspension height of this moment was higher than horizontal level; When this position was 1, the suspension height of this moment was lower than horizontal level.Data 6 are the control byte of AFS controller with data 7, its data structure is as shown in figure 12: the current state that has wherein comprised multiple vehicle, the main Control Parameter of AFS controller has the dipped beam state, ignition key status, AFS on off state and astern signal state etc.When 1 of the Bit of data 6 was 0, dipped headlights was in closed condition, and this moment, the AFS system should close; When 1 of Bit was 1, dipped headlights was in opening, and this moment, the AFS system should open.When 3 of the Bit of data 7 were 0, the AFS switch was in closed condition, and this moment, the AFS system should close; When 3 of Bit were 1, the AFS switch was in opening, and this moment, the AFS system should open.When 2 of the Bit of data 7 were 0, vehicle was in the cruising state, and this moment, the AFS system can open; When 2 of Bit were 1, vehicle was in the reversing state, and this moment, the AFS system should quit work, and kept front illumination.
The process of a Control Circulation is described in conjunction with Fig. 2 and Fig. 8:
(1) starts adaptive front lighting lamp system control system 801;
(2) MCU module 102 is carried out variable-definition and initialization 802 thereof;
(3) setting 803 of the initialization of ancillary equipment and state thereof, comprise the CAN communication control module is set, expand the operating state that communication module is provided with power management module MC33889 by SPI, the operating state of step motor control module 104 etc. is set by iic bus;
(4) the CAN bus transceiver among the power management module MC33889 carries out the reception 804 of CAN information and order;
(5) AFS controller 100 carries out following control according to the dipped beam state and the reversing state of the vehicle that receives by vehicle body transducer 200:
During the dipped beam state 805: judge whether dipped headlights is opened, if dipped headlights is in closed condition, this moment, the AFS system closed automatically, and returned step (4); If dipped headlights is in opening, judge whether the AFS system is in opening 806, if the AFS system is in opening, order is carried out next step; Otherwise, return step (4);
During the reversing state 807: judge whether vehicle is in the cruising state, if vehicle is in the cruising state, open the AFS system this moment, order is carried out next step; If vehicle is in the reversing state, this moment, the AFS system quit work, and kept front illumination, returned step (4);
(6) signal of vehicle body transducer 200 carries out the coupling of filtering and voltage by signal conditioning circuit 103, and MCU module 102 comes from the information of vehicle body transducer 200 by self AD and the collection of PWM interface, and handles this information 808;
(7) calculate the drift angle 809 of front car light by following formula by MCU module 102:
Wherein: L---vehicle wheelbase; α---steering wheel angle; φ---car light drift angle; K---steering characteristic coefficient; V---speed of a motor vehicle function; T---shift to an earlier date lighting hours;
(8) MCU module 102 is sent to step motor control module 104 by iic bus with control command, rotates with the stepping motor that drives in vertical adjustment actuator and the horizontal rotation actuator, thereby makes front car light reach best illuminating effect 810;
(9) return above-mentioned steps (4), continue self adaptation and adjust front car light system.
Although in conjunction with the accompanying drawings the present invention has been carried out foregoing description; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; under the situation that does not break away from aim of the present invention and claim institute protection range, can also make a lot of distortion, these all belong to the row of protection of the present invention.
Claims (6)
1. the adaptive front lighting lamp system control system of a technology Network Based comprises AFS controller (100), vehicle body transducer (200) and actuator (300), it is characterized in that:
Described AFS controller (100) comprising: by spi bus and power management and CAN transceiver module 101) the MCU module (102) that is connected; By the signal conditioning circuit (103) that voltage and PWM waveform are connected with described MCU module (102), described signal conditioning circuit (103) comprises steering wheel angle signal input modulate circuit, vehicle speed signal input modulate circuit and suspension altitude signal input modulate circuit; The step motor control module (104) that is connected with MCU module (102) by iic bus;
Described vehicle body transducer (200) comprises the steering wheel angle sensor (201) that is connected with steering wheel angle signal input modulate circuit, imports vehicle speed sensor (202) that modulate circuit is connected, imports front suspension height sensor (203) and the rear suspension height sensor (204) that modulate circuit is connected with the suspension altitude signal respectively with vehicle speed signal;
Described actuator (300) comprises vertical adjustment actuator and the horizontal rotation actuator that is connected with AFS controller (100) respectively;
Described AFS controller (100) is by CAN/LIN and vehicle body net connection.
2. the adaptive front lighting lamp system control system of technology Network Based according to claim 1, it is characterized in that: described power management and CAN transceiver module (101) adopt the chip MC33889 of motorola inc's production, are used for the CAN bus transceiver of power management and built-in low speed fault tolerant simultaneously.
3. the adaptive front lighting lamp system control system of technology Network Based according to claim 1, it is characterized in that: described MCU module (102) adopts the R8C21237 chip of Renesas's production, and comprises oscillator and detection timer on 8 multi-functional timers, 16 bit timing devices, UART/ clock synchronization serial line interface, voltage detecting circuit, electrify restoration circuit, the high/low speed sheet at peripheral hardware on its standard film; UART, iic bus interface have been added simultaneously; The IIC chip selects clock synchronization serial line interface, 10 A/D converters and vibration to stop measuring ability; Be equipped with hardware LINN module and CAN communication control module; Maximum operating frequency is 20MHz; Provide 48 pin package to have abundant I/O resource and embedded the data flash memory simultaneously;
Described CAN communication control module and SPI expansion communication module and iic bus interface, the iic bus interface is used for the communication of MCU module and step motor control module;
CAN transceiver interface among described CAN communication control module and the power management module MC33889, the two is in conjunction with conditioning and the transmitting-receiving of finishing the CAN signal jointly.
4. the adaptive front lighting lamp system control system of technology Network Based according to claim 1, it is characterized in that: described vertical adjustment actuator comprises that left lamp vertically adjusts the vertical stepping motor of adjusting with right lamp of stepping motor, described horizontal rotation is adjusted actuator and is comprised left lamp horizontal adjusting stepping motor and right lamp horizontal adjusting stepping motor, and above-mentioned a plurality of stepping motors are used for the level of headlight and the angle adjustment of vertical direction;
Described step motor control module (104) comprises that left lamp is vertically adjusted the step motor control module, right lamp is vertically adjusted step motor control module, left lamp horizontal adjusting step motor control module and right lamp horizontal adjusting step motor control module; The AMI30622 chip that above-mentioned each step motor control module adopts AMIS company to produce respectively, they insert iic bus jointly;
Described AMI30622 chip comprises the positioner and the control diagnose interface of stepping motor; control is by the IIC interface; programmable output driving current maximum can reach 800mA; the wide region input voltage can reach 8V-29V, has overcurrent protection, over voltage alarm, overtemperature alarm and automatically shuts down function.
5. the adaptive front lighting lamp system control system of technology Network Based according to claim 1 is characterized in that:
Described steering wheel angle signal input modulate circuit comprises the low-frequency disturbance capacitor C 1 that is used on the trap signal, constitute the resistance R 3 and the resistance R 4 of potential-divider network and be used for the capacitor C 2 of the High-frequency Interference on the trap signal; One end of described capacitor C 1 is connected other end ground connection with described steering wheel angle sensor (201); Resistance R 1 one ends of potential-divider network are connected with steering wheel angle sensor (201), and the other end is connected with resistance R 3, the other end ground connection of resistance R 3, and described resistance R 3 is also in parallel with capacitor C 2, and an end of capacitor C 2 is connected with the input signal AD0 of MCU module (102);
Described vehicle speed signal input modulate circuit adopts difference form, and its formation is: resistance R 7 one ends are connected other end ground connection with vehicle speed sensor (202); Described resistance R 7 also is connected with a resistance R 8, and the other end of resistance R 8 is connected with the positive input of an operational amplifier LM358; Also comprise a resistance R 9, the one end is connected with+12V power supply, and the other end is connected the other end ground connection of resistance R 10 with the negative input of above-mentioned operational amplifier LM358 and an end of resistance R 10 respectively; One resistance R 11 is connected with the output of above-mentioned operational amplifier LM358, and the other end is connected with the input of photoelectrical coupler L/P, and the output of described photoelectrical coupler L/P is connected with the input signal PWM0 of resistance R 12 with described MCU module (102) respectively; The other end of resistance R 12 is connected with+5V power supply; Above-mentioned resistance R 9 and resistance R 10 are used to set the threshold value of input, and above-mentioned optical coupling device L/P is used for isolate disturbing and level conversion, make signal after the filtration import the input capture unit of MCU module (102) through optical coupling device L/P conversion back;
Described front suspension height modulate circuit is the same with the structure of rear suspension height modulate circuit, comprise: after resistance R 13 and resistance R 15 series connection, one end and corresponding suspension height sensor connection, other end ground connection, wherein resistance R 15 also is parallel with a capacitor C 7, and an end of described capacitor C 7 is connected with MCU module (102) input signal AD4.Above-mentioned resistance R 13 and R15 constitute potential-divider network.
6. utilize the control method of the adaptive front lighting lamp system control system of technology Network Based as claimed in claim 1, it is characterized in that: may further comprise the steps:
(1) starts the adaptive front lighting lamp system control system;
(2) MCU module (102) is carried out variable-definition and initialization thereof;
(3) setting of the initialization of ancillary equipment and state thereof, comprise the CAN communication control module is set, expand the operating state that communication module is provided with power management module MC33889 by SPI, the operating state of step motor control module (104) etc. is set by iic bus;
(4) the CAN bus transceiver among the power management module MC33889 carries out the reception of CAN information and order;
(5) AFS controller (100) carries out following control according to the dipped beam state and the reversing state of the vehicle that receives by vehicle body transducer (200):
During the dipped beam state: judge whether dipped headlights is opened, if dipped headlights is in closed condition, this moment, the adaptive front lighting lamp system control system was closed automatically, and returned step (4); If dipped headlights is in opening, judge whether the adaptive front lighting lamp system control system is in opening, if the adaptive front lighting lamp system control system is in opening, order is carried out next step; Otherwise, return step (4);
During the reversing state: judge whether vehicle is in the cruising state, if vehicle is in the cruising state, open the adaptive front lighting lamp system control system this moment, order is carried out next step; If vehicle is in the reversing state, this moment, the AFS system quit work, and kept front illumination, returned step (4);
(6) signal of vehicle body transducer (200) carries out the coupling of filtering and voltage by signal conditioning circuit (103), and MCU module (102) comes from the information of vehicle body transducer (200) by self AD and the collection of PWM interface, and handles this information;
(7) calculate the drift angle of front car light by following formula by MCU module (102):
Wherein: L---vehicle wheelbase; α---steering wheel angle; φ---car light drift angle; K---steering characteristic coefficient; V---speed of a motor vehicle function; T---shift to an earlier date lighting hours;
(8) MCU module (102) is sent to step motor control module (104) by iic bus with control command, rotates with the stepping motor that drives in vertical adjustment actuator and the horizontal rotation actuator, thereby makes front car light reach best illuminating effect;
(9) return above-mentioned steps (4), continue self adaptation and adjust front car light system.
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