CN201613867U - Automobile electrical automobile window anti-pinch control CAN bus circuit - Google Patents

Abstract

The utility model discloses an automobile electrical automobile window anti-clamp control CAN bus circuit, wherein a main driving automobile window controller, an accessory driving automobile window controller, a rear row left-side automobile controller, a rear row right-side automobile controller and a top skylight controller are connected with a control unit through a CAN bus, and the control unit comprises a power supply circuit, a CAN bus transceiver, a photoelectric coupler, a microcontroller, a current sampling circuit, a power driving circuit, a signal processing circuit and a lifting switch interface circuit. The current sampling circuit is formed through connecting a Cur R end in the power driving circuit and a RA0 port of the microcontroller. The automobile electrical automobile window anti-clamp control CAN bus circuit uses a CAN bus, and can reduce wires of five automobile windows in a connecting vehicle to one fifth of original wires. Simultaneously, the control device has the automobile window anti-clamp function, can effectively prevent human bodies from being clamped injury, and increases the safety of automobiles.

Description

Automobile electric car-window anti-pinch control CAN bus circuit

Technical field

The utility model relates to a kind of automobile electric car-window anti-pinch control circuit.

Background technology

What the automobile electric car-window controller adopted usually is the single control mode of " point-to-point ", rare each other contact.So just make wire harness increase in the car, complicated, the poor reliability of wiring.The domestic automobile that has has adopted electronic anti-pinch vehicle window at present, can prevent effectively that human body from being crushed by electric driven glass; As adopt Hall element to detect the rotating speed of electrical motor constantly, when automatic window runs into obstacle in uphill process, motor speed will slow down, Hall element is sent to microprocessor detecting the variation that rotation speed change converts electric current to, microprocessor sends control signal and makes Car window electric machine stall or counter-rotating by relay, so vehicle window also just stops to move or descending, and therefore has certain pinch resistant functionality.But there are problems such as complex structure, cost height, installation inconvenience in the structure that adopts Hall element.

The utility model content

The technical problems to be solved in the utility model is, provide a kind of automobile electric car-window anti-pinch control CAN bus circuit, to overcome the deficiency of the fringe cost that existing automobile electric car-window control system complex circuit, the control problem that contact is many, the lead consumption is big and installation Hall element bring.

The utility model solves its technical matters and the technical scheme that adopted is: main vehicle window controller, copilot vehicle window controller, player No.5's sidecar window controller, the control of back right sidecar window and the top vehicle window controller driven is connected with control unit by the CAN bus.

Control unit comprises power circuit, CAN bus transceiver, photoelectrical coupler, microcontroller, current sampling circuit, power driving circuit, direction switch interface circuit, signal processing circuit.

Current sampling circuit is connected to form by the RAO port of the end of the Cur R in the power driving circuit with microcontroller.

Being used for each device bonded assembly CAN bus is two leads.

Because the CAN bussing technique derives from so very proven technique of industry spot control bus and LAN, have very high reliability, real-time and anti-interference resistance, it is strong and vibrate big workplace to be particularly suitable for this work under bad environment of automobile, electromagnetic radiation.Its principal feature is: the real-time Transmission that only just can realize multi-path signal with the few lead of quantity.Adopt the CAN bus four vehicle window controllers of automobile and top louver controller connect into behind the local area network can realize convenient to automotive window, freely, flexibly wiring in the car to be reduced to original 1/5th, increases the reliability and the safety of automobile.

The utility model has been realized pinch resistant functionality; promptly by adopting smart power device control Car window electric machine; cross electric current in the Car window electric machine by sample streams; thereby the change in resistance that runs in the monitoring car window glass up-down process automatically performs pinch resistant functionality, can realize overcurrent, overvoltage and overheating protection to Car window electric machine simultaneously.

Compared with the prior art, the beneficial effects of the utility model are, can make the lead that connects five vehicle windows in the car be reduced to original 1/5th.This control setup has the anti-pinching car window function simultaneously, can effectively prevent crushing of human body, improves the safety of automobile.This system only just can realize, flexibly control convenient to five vehicle windows with two leads, and automatic window has pinch resistant functionality and perfect defencive function simultaneously.

Description of drawings

Fig. 1 is a CAN bus automatic window Control Network topological diagram of the present utility model;

Fig. 2 is a CAN bus automatic window control system block scheme of the present utility model;

Fig. 3 is a PIC18F258 microcontroller scheme drawing of the present utility model;

Fig. 4 is the scheme drawing of high-speed photoelectric coupler 6N137 of the present utility model;

Fig. 5 is the scheme drawing of CAN bus transceiver PCA82C250 of the present utility model;

Fig. 6 is the scheme drawing of driving circuit MC33486 of the present utility model;

The scheme drawing of Fig. 7 power circuit of the present utility model.

The specific embodiment

Embodiment of the present utility model: universe network of the present utility model connects as shown in Figure 1.Main vehicle window controller, copilot vehicle window controller, player No.5's sidecar window controller, the control of back right sidecar window and the top vehicle window controller driven is connected with control unit by the CAN bus.Total system is controlled it by control unit.Operator's compartment vehicle window master controller wherein except controlling self window lifting, can also be controlled the lifting of other three automatic windows and the switching of top vehicle window independently by the CAN bus.

As shown in Figure 2, control unit of the present utility model comprises power circuit 1, CAN bus transceiver 2, photoelectrical coupler 3, microcontroller 4, current sampling circuit 5, driving circuit 6, direction switch interface circuit 7, signal processing circuit 8.

Wherein, power circuit 1 comprises storage battery and voltage stabilizing/insulating power supply, the positive and negative end of the input of voltage stabilizing/insulating power supply is connected with the positive and negative electrode of storage battery, and the mouth of constant voltage power suspply is connected with microcontroller 4, photoelectrical coupler 3, CAN bus transceiver 2, power driving circuit 6, signal processing circuit 8.

Microcontroller 4 comprises PIC micro controller system and CAN bus controller, and the PIC micro controller system is connected with photoelectrical coupler 3, driving circuit 6 and signal processing circuit 8.

Power driving circuit 6 comprises current sampling circuit 5, and current sampling circuit 5 is connected to form by the RA0 port of the end of the Cur R in the power driving circuit 6 with microcontroller.

Following mask body is introduced device and the connection situation thereof that the utility model adopts.

Microcontroller 4 is as the core of The whole control system.Consider simultaneously cost performance again for the abominable working environment that adapts to automobile, select to have the PIC18F258 microcontroller of automotive grade range of temperatures and cheap U.S. MICROCHIP company.The PIC18F258 microcontroller has advanced reduced instruction set computer framework, enhancement mode kernel, 32 grades of storehouses and multiple inside and outside interrupt source, and inside has the CAN bus controller, and has adopted program and data space distinct " Harvard " structure.This structure greatly reduces the overall cost of PIC microcontroller, has improved operating efficiency simultaneously.Microcontroller circuit as shown in Figure 3.

Photoelectrical coupler 3 adopts the 6N137 high-speed photoelectric coupler.For the antijamming capability that improves system and the ability of transmission signals, adopt 6N137 high speed optoelectronic coupled circuit can realize the electrical isolation between the node on the bus well.Two power supply V of high-speed photoelectric coupler _CCAnd V _CCMust adopt power isolation circuit to isolate fully, 6N137 high-speed photoelectric coupler circuit as shown in Figure 4.

CAN bus transceiver 2 adopts PCA82C250.PCA82C250 is the CAN Bus Interface Chip of PHILPS company, is the interface between CAN controller and the physical bus, provides the difference transmission of bus and the ability that receives.It and ISO11898 standard are compatible fully, and 3 kinds of different mode of operation i.e. high speed, slope control and standby are arranged, and can select according to actual conditions, select the high speed operation mode in this programme.This chip pin is few, uses simple.The CAN bus adopts the interface between conduct of PCA82C250 chip and the bus, and the CANH of PCA82C250, the pin of CANL link to each other with the CAN bus by a resistance separately, and resistance can play certain metering function, and protection PCA82C250 avoids the impact of overcurrent.Two little electric capacity in parallel between CANH and CANL and the ground can play the radio-frequency interference on the filtering bus and the ability of anti-electromagnetic radiation.The PCA82C250 circuit as shown in Figure 5.

Power driving circuit 6 adopts the smart power device MC33486 of MOTOROLA company, and it is directly linked to each other with microcontroller PIC18F258, receives control signal.The application model of this chip is a bridge architecture, internal module has comprised two high-end power MOSFETs, so just constituted a complete H bridge, realized to control as shown in Figure 6 " just/anti-" of Car window electric machine with external two low side power MOSFET devices.MOS among the figure ₁, MOS ₂Be the built-in MOSFET of MC33486 chip, MOS ₃, MOS ₄Be external two MOSFET (MC1413).V _InBe chip for driving power supply voltage, IN ₁, IN ₂Be subjected to the direct control of MCU, GLS ₁, GLS ₂With IN ₁, IN ₂Become logic " non-" relation.OUT ₁, OUT ₂The direct drive Car window electric machine.For example: IN ₁, IN ₂During for " 1 ", " 0 ", corresponding GLS ₁, GLS ₂Be " 0 ", " 1 ".At this moment, MOS ₁Conducting, MOS ₂End MOS ₃End MOS ₄So conducting is OUT ₁, OUT ₂The logic level of output is " 1 ", " 0 ", drives Car window electric machine and turns round towards some directions, and vice versa.Be reverse flywheel diode with the MOSFET diode connected in parallel among the figure, the protection power chip is not damaged.

Current sampling circuit 5 is to be connected to form by the RA0 port of the end of the Cur R in the power driving circuit 6 with microcontroller.The pinch resistant functionality of vehicle window mainly is to realize that by the variation of monitoring Car window electric machine electric current when working the variation of Car window electric machine electric current can comparatively correctly reflect the moving situation of vehicle window.Current of electric should not be a variation curve more slowly if vehicle window is subjected to hindering in the process that rises.If but vehicle window has been subjected to obstruction, very big variation will appear in current of electric so.Therefore, after the electric current that records under the situation that externally condition is identical being carried out filtering and processing, can be with it as judging whether vehicle window is subjected to the foundation of clamping.The function that the Cur R pin of MC33486 power chip has the load current linearity to duplicate, it can monitor the electric current of mouth with the ratio of high-end outgoing current 1/3700, and following mathematical relation is arranged:

$I_{\mathrm{CurR}}=\frac{1}{3700}*I_{\mathrm{load}}$

Wherein, I _{Cur R}Be the electric current that the Cur R end of power chip is exported, I _LoadBe the Car window electric machine electric current.

This electric current becomes voltage to be input to " analog-digital " sampling end (accompanying drawing 6) of microcontroller by minute pressure handle current conversion.The voltage that is input to microcontroller is:

U＝I _Cur?R*R ₇

Voltage U just can obtain the real current of load through " analog-digital " conversion back.Therefore, monitor the voltage U that is input to microcontroller and just be equal to the electric current of monitoring in the Car window electric machine.Thereby can realize the pinch resistant functionality of automatic window.

Power circuit 1 comprises storage battery and voltage stabilizing/insulating power supply.The vehicle power of automotive system is+12V, and controller needs+12V and+two kinds of DC power supply of 5V.Therefore need carry out conversion with three terminal regulator LM78L05 from+12V voltage to+5V voltage.Wherein+and the 12V power supply mainly is to provide driving voltage to Car window electric machine ,+5V power supply provides operating voltage then for the chip in the circuit.Circuit theory as shown in Figure 7.Electric capacity among the figure plays filtering radio-frequency interference and low-frequency disturbance, and+B is the Vehicular accumulator cell power supply, V _CCFor+the 5V power supply.The power circuit diagram connection mode is: the positive and negative end of the input of voltage stabilizing/insulating power supply is connected with the positive and negative electrode of automotive battery, and the mouth of constant voltage power suspply provides stable working power (accompanying drawing 7) for PIC micro controller system, photoelectrical coupler, CAN transceiver, signal processing circuit, power device.

Claims (4)

1. an automobile electric car-window anti-pinch is controlled the CAN bus circuit, it is characterized in that: main vehicle window controller, copilot vehicle window controller, player No.5's sidecar window controller, the control of back right sidecar window and the top vehicle window controller driven is connected with control unit by the CAN bus.

2. automobile electric car-window anti-pinch control CAN bus circuit according to claim 1, it is characterized in that: control unit comprises power circuit (1), CAN bus transceiver (2), photoelectrical coupler (3), microcontroller (4), current sampling circuit (5), power driving circuit (6), direction switch interface circuit (7), signal processing circuit (8).

3. automobile electric car-window anti-pinch control CAN bus circuit according to claim 2, it is characterized in that: current sampling circuit (5) is connected to form by the RA0 port of the end of the CurR in the power driving circuit (6) with microcontroller (4).

4. automobile electric car-window anti-pinch control CAN bus circuit according to claim 1, it is characterized in that: being used for each device bonded assembly CAN bus is two leads.

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