CN104936354A - Automotive rear indoor lamp control module and control method - Google Patents

Abstract

The invention discloses an automotive rear indoor lamp control module. The rear indoor lamp control module comprises a power supply voltage stabilizing filtration module, a left-right switch de-twitter circuit for rear ceiling lamps, a module for converting a switch level signal to a trigger signal, a two-way trigger, a dual-channel driving bulb chip for driving the ceiling lamps, and status indicator lamps for the rear ceiling lamps, wherein the output of the left-right switch de-twitter circuit for the rear ceiling lamps is connected to the two-way trigger; the output end of the module for converting the switch level signal to the trigger signal is connected to the two-way trigger; the output of the two-way trigger is connected to the dual-channel driving bulb chip; the output of the dual-channel driving bulb chip is connected with the left and right rear ceiling lamps; and meanwhile, the output of the dual-channel driving bulb chip is also connected with the status indicator lamps for the rear ceiling lamps.

Description

Control module and control method for rear indoor lamp of vehicle

Technical Field

The invention belongs to the technical field of automobile control, and particularly relates to a control module and a control method for a rear indoor lamp of an automobile.

Background

The model of the German popular MQB platform, the model of the world, the predicted annual output is about 350 thousands. The logic of the middle top lamp of the platform is disordered, and under the condition that the rear top lamp is turned on by a rear row of operators through a rear top lamp switch, the front row of operators cannot turn off the rear top lamp; similarly, when the front operator lights the rear dome lamp, the rear operator has no way to turn it off. This logical disruption of hardware leads to complaints and complaints by MQB platform car-type customers. The most popular engineers propose to solve the above defects of the design and rapidly push the model of the MQB platform to the market, but most of the solutions are processor solutions, the cost of the solutions is high, the software approval period of the public is long, the original batch ceiling lamp molds need to be completely re-developed, and the german popular engineers of the solutions are not satisfied.

Disclosure of Invention

The invention aims to provide a control module and a control method for a rear indoor lamp for a vehicle.

The technical scheme of the invention is that the control module of the rear indoor lamp for the vehicle comprises a power supply voltage-stabilizing filter module, a left and right switch jitter-removing circuit of the rear dome lamp, a switch level signal conversion trigger signal module, a two-way trigger, a two-channel driving bulb chip for driving the dome lamp and a rear dome lamp state indicator lamp,

wherein, switch goes about back dome lamp and shakes the output of circuit and inserts the dual-path trigger, switch level signal conversion is the output of trigger signal module and inserts the dual-path trigger, the output of dual-path trigger inserts binary channels drive bulb chip, the output of binary channels drive bulb chip is connected left and right back dome lamp, simultaneously, the output of binary channels drive bulb chip is also connected back dome lamp state pilot lamp.

And the power supply voltage-stabilizing filtering module of the rear indoor lamp control module is connected with a vehicle body power supply module.

And the switch level signal of the rear indoor lamp control module is converted into a trigger signal module which is connected with a front dome lamp master control switch of the front dome lamp module.

A control method for a rear room lamp of a vehicle is characterized in that SW1 is a left rear dome lamp switch, SW2 is a right rear dome lamp switch, SW3 is a front dome lamp main switch, LD1 is a left rear dome lamp, LD2 is a right rear dome lamp, and LED1 is a rear dome lamp function indicator lamp.

SW1 and SW2 are self-reset switches, SW3 is a self-hold switch, has a 3-neutral state, including a ground state, a PWM input rail, and a float state,

the PWM input signal is a 200HZ square wave with the duty ratio of 0-100% output by the vehicle body controller when the door switch is opened

The method is characterized by comprising the following steps:

step 1, when Sw1 is pressed or released, the state of LD1 transits to the opposite state of the previous state, and when Sw2 is pressed or released, the state of LED1 transits to the opposite state of the previous state;

step 2, when the state of the SW3 is changed from the suspended state to the grounded state, the states of the LD1 and the LD2 are changed into the bright state no matter whether the previous state is bright or not;

step 3, when the state of SW3 changes from the ground state to the floating state, the states of LD1 and LD2 change to the bright state no matter whether the previous state is bright or not.

If all of Sw3, Sw1 and Sw2 are operated within a set time, the states of LD1 and LD2 are determined only by the last button operation.

When the SW3 switch is switched to the PWM input gear, a PWM signal is input, and the functions of gradually turning on or off the LD1 and the LD2 are realized.

When any one of the bulbs in LD1 and LD2 is in a lighting state, the LED1 function indicator lamp is turned on.

The invention selects a reliable trigger hardware control strategy without adopting a processor, and a pure hardware circuit of the vehicle rear indoor lamp control module to solve the defect of the strategy of the popular MQB platform based on rear dome lamp control. The realization of the control module solves the complaint of customers with high requirement on operation feeling, the cost is not increased basically, the mould does not need to be changed, and the approval period of the public is greatly shortened.

Drawings

Fig. 1 is a schematic diagram of a rear room lamp control module for a vehicle according to the present invention.

FIG. 2 is a functional table of combinational logic in an embodiment of the present invention.

Fig. 3 is a power input waveform in an embodiment of the invention.

FIG. 4 is a schematic diagram of a switch portion of the SW1\ SW2 switch in the embodiment of the present invention

FIG. 5 is a schematic diagram of an Sw3 switch input circuit in an embodiment of the present invention

Fig. 6 is a logic state diagram of the control action of the rear indoor lamp of the present invention.

Detailed Description

As shown in fig. 1, the rear indoor lamp control module for a vehicle based on the mass MQB platform of the present invention includes a power supply voltage stabilization filter module, a left and right switch jitter removal circuit for a rear dome lamp, a switch level signal conversion to trigger signal module, a dual-way trigger MC14013, a dual-channel driving bulb chip for driving the dome lamp, and a rear dome lamp status indicator lamp.

The PWM (pulse width modulation) input signal is a 200HZ square wave with the duty ratio of 0-100% output by a vehicle body controller when a door switch is opened, and two solutions exist because a processor scheme is not adopted. A direct drive load, a set and reset state that uses a flip-flop to achieve the gradual on and gradual off. Due to the logic state switching, the MQB platform common fault occurs when the load is directly driven. The control module of the back room ceiling lamp adopts the trigger to realize the function of PWM gradually-on and gradually-off.

The modules are implemented as follows:

the input power waveform of the power supply voltage stabilizing and filtering module is shown in fig. 3. 5MS interruption can occur in a power supply, the trigger is reset due to the interruption of the power supply due to the adoption of a non-processor mode, voltage reduction filtering must be adopted for the power supply, the power supply is kept at 9V constant direct current, the normal work can be realized within the voltage range of 3V-18V due to the adoption of the trigger, and as long as the low level is ensured to be larger than 3V by the adoption of the filtering, the state of the system is kept unchanged after the interruption of the power supply is recovered.

The switches Sw1 and Sw2 are self-reset switches, and since the selected flip-flop is switched from low to high, the output is latched, and the truth table of the flip-flop is shown in fig. 2. When the key is pressed down, the key shakes, the normal time is 20MS, hardware is adopted to remove the shake, and the key cannot turn over for many times.

The SW3 switch is switched between low and PWM input signal, suspended state, the switch form being self-holding. Each time the SW3 switch goes low, the left and right rear dome lamps are all turned on, and when SW3 goes from low to floating, the left and right rear dome lamps are all turned off. When the SW3 is switched to the PWM gear, the rear dome lamp is turned on or off gradually due to the change of the PWM signal high-low switching duty ratio, and the circuit of the SW3 switching part is shown in FIG. 5. Wherein,

1) the SW3 input is divided into two conditions, one is that the rear dome lamp is completely extinguished or the switch signal is lightened; the other is a PWM input signal; the effect of the C7\ C8 capacitor is that the continuous level of the level jump has no influence on the trigger, and only the edge has effect on the trigger.

2) When the SW3 input is the switch signal, the high-to-low jump is that the left circuit, the trigger SET pin receives a high level jump, so that the LD1 and the LD2 lamps are lighted no matter what state the original lamps are. When SW3 jumps from ground to floating, the CLR pin of the trigger receives a jump from low to high, so that the LD1 and the LD2 bulbs are extinguished no matter what state the original bulbs are

3) And the PWM input is a signal with the duty ratio from 0 to 100 percent, and is switched continuously relative to the switching signal, so that the SET pin and the CLR pin of the trigger are switched continuously to realize the functions of gradually turning off and gradually turning on.

When the rear dome lamp is in an on or off state, SW1 or SW2 is pressed, and the left or right rear dome lamp is turned off or on. The action logic state diagram is shown in FIG. 6.

Today of global vehicle type platform high-speed development, the module can be approved and replaces the original ceiling lamp module scheme, and the module is also an incentive for local automobile part enterprises while bringing about millions of profits. With the improvement of the design level of local automobile part enterprises, the parts of global platform vehicle types are optimized, improved and replaced, and finally the platform globalization of the local automobile manufacturing industry is realized.

Claims (7)

1. A control module of a rear indoor lamp for a vehicle is characterized by comprising a power supply voltage-stabilizing filter module, a left and right switch jitter removal circuit of a rear dome lamp, a switch level signal conversion module, a two-way trigger, a two-channel driving bulb chip for driving the dome lamp and a rear dome lamp state indicator lamp,

wherein, switch goes about back dome lamp and shakes the output of circuit and inserts the dual-path trigger, switch level signal conversion is the output of trigger signal module and inserts the dual-path trigger, the output of dual-path trigger inserts binary channels drive bulb chip, the output of binary channels drive bulb chip is connected left and right back dome lamp, simultaneously, the output of binary channels drive bulb chip is also connected back dome lamp state pilot lamp.

2. The rear room lamp control module for vehicle as claimed in claim 1, wherein the power supply voltage stabilizing filter module of the rear room lamp control module is connected to the vehicle body power supply module.

3. The rear room lamp control module for vehicle as claimed in claim 1, wherein the switching level signal of the rear room lamp control module is converted into a front dome lamp general control switch for triggering the signal module to connect the front dome lamp module.

4. A control method of rear room lamp for vehicle is to set SW1 as left rear dome lamp switch, SW2 as right rear dome lamp switch, SW3 as front dome lamp main switch, LD1 as left rear dome lamp, LD2 as right rear dome lamp, LED1 as rear dome lamp function indicator lamp,

SW1 and SW2 are self-reset switches, SW3 is a self-hold switch, has a 3-neutral state, including a ground state, a PWM input rail, and a float state,

the PWM input signal is a 200HZ square wave with the duty ratio of 0-100% output by the vehicle body controller when the door switch is opened

The method is characterized by comprising the following steps:

step 1, when Sw1 is pressed or released, the state of LD1 transits to the opposite state of the previous state, and when Sw2 is pressed or released, the state of LED1 transits to the opposite state of the previous state;

step 2, when the state of the SW3 is changed from the suspended state to the grounded state, the states of the LD1 and the LD2 are changed into the bright state no matter whether the previous state is bright or not;

step 3, when the state of SW3 changes from the ground state to the floating state, the states of LD1 and LD2 change to the bright state no matter whether the previous state is bright or not.

5. The control method of a rear room lamp for a vehicle of claim 4, comprising the steps of:

if all of Sw3, Sw1 and Sw2 are operated within a set time, the states of LD1 and LD2 are determined only by the last button operation.

6. The control method of a rear room lamp for a vehicle of claim 4, comprising the steps of:

when the SW3 switch is switched to the PWM input gear, a PWM signal is input, and the functions of gradually turning on or off the LD1 and the LD2 are realized.

7. The control method of a rear room lamp for a vehicle of claim 4, comprising the steps of:

when any one of the bulbs in LD1 and LD2 is in a lighting state, the LED1 function indicator lamp is turned on.