RU2127676C1 - Vehicle windshield wiping system - Google Patents

Abstract

FIELD: transport engineering; automobile electric equipment. SUBSTANCE: proposed device, like other known ones, has standard wiper circuit and additionally automatic glass cleaning system with windshield glass contamination pickup connected in parallel. This system responds to glass contamination rate. Owing to use of phase detection, operations caused by gradual change of glass contamination level when there is no necessity of glass cleaning are prevented. This precludes unexpected operation of system in running and arresting of attention of driver. Glass cleaning system responsive to glass contamination rate ensure against emergency situations on the road when glass in suddenly splashed with mud thrown by wheels of foregoing vehicle. EFFECT: enhanced safety. 1 dwg

Description

 The invention relates to electrical equipment of automobiles, in particular, to devices for glass-cleaning vehicles.

 A device [1] for automatic control of a wiper motor is known, in which the precipitation control unit on the windshield contains an ultrasound generator and emitter mounted on one side of the inner surface of the windshield and an ultrasonic radiation receiver on the other side of the windshield.

 The disadvantage of this device is the use of ultrasonic vibrations, which leads to additional vibrations, as well as the complexity of the equipment used. In addition, it is unacceptable to turn on the wiper drive without turning on the glass washer.

 A device [2] is known, which contains two optically coupled emitter – radiation detector optically coupled through glass, the first optocoupler pair controlling the degree of contamination of the outer surface of the glass, and the second - the inner one.

 The disadvantages of this glass cleaning system is its operation at the level of glass contamination, which can lead to unexpected wiper operations during the movement and, as a result, it becomes possible to commit a traffic accident.

 The closest in technical essence of the solution is the device [3], containing a standard wiper circuit and an automatic glass cleaning system connected in parallel, containing a glass contamination sensor, a pulse generator, a matching circuit, two electronic keys, a trigger.

 The disadvantages of this device is that the cleaning system automatically responds to the level of contamination of the glass, for example, its gradual dusting or the appearance of water droplets, and, as a result, the window washer and the wiper drive turn on unexpectedly for the driver. Thus, when the car moves, an element of surprise appears that can distract the driver from direct control of the car and lead to an emergency. In such conditions of gradual contamination of the glass, it is advisable that the driver himself choose the moment the wiper is turned on and the mode of its operation. On the other hand, in unexpected traffic situations, for example, sudden and sharp contamination of glass by passing vehicles, and, as a result, an instant loss of visibility of the road by the driver, the device should turn on immediately and automatically.

 In addition, since the device is triggered by a decrease in the luminous flux of the sensor, at night, when the glass is unexpectedly contaminated, the useful luminous flux of the sensor drops, but if at that time the glass is illuminated by the headlights of oncoming vehicles, the total luminous flux may be significant and the sensor may not will work or will work with delay.

 The aim of the invention is to increase traffic safety.

 The solution to this problem is achieved by the fact that a second generator, a phase detector, a low-pass filter, a differentiating amplifier, a comparator, an amplifier, a third and fourth electronic keys are additionally introduced into the vehicle’s glass cleaning system, and the first output of the second generator is connected to the input of the glass pollution sensor, the output of which is connected to the first input of the phase detector, the second output of the second generator is connected to the second input of the phase detector, the output of the phase detector is connected to the input of the ph Three low frequency, the output of which is connected to the input of the differentiating amplifier and the input of the amplifier, the output of the differentiating amplifier through a comparator is connected to the input of the third electronic key, the output of which is connected to the first input of the matching circuit, the second input of the trigger and the output of the fourth electronic key, the output of the amplifier is connected to the input fourth electronic key, the direct output of the trigger is connected to the control input of the fourth electronic key, and the inverse output of the trigger is connected to the control input of the third ele ctron key.

 Comparative analysis with the prototype shows that the claimed vehicle glass cleaning system is distinguished by the introduction of new functional units into the circuit: a second generator, a phase detector, a low-pass filter, a differentiating amplifier, a comparator, an amplifier, an additional pair of electronic keys, as well as the connections between previously used and newly entered items. This allows us to conclude that the proposed solution meets the criterion of "novelty."

 The ability of the inventive cleaning system to respond to the rate of change of the glass contamination, as well as increasing the sensitivity and noise immunity due to the use of phase detection eliminates device triggering associated with a gradual change in the level of glass contamination, when there is no special need for automatic cleaning. This allows you to get rid of unexpected for the driver positives of the cleaning system in the process of movement and, as a result, the dispersion of his attention or the possibility of an unpredictable reaction on his part. A cleaning system that responds to the rate of change in glass contamination can automatically avoid an emergency, for example, when glass is suddenly contaminated from under the wheels of other vehicles. This allows us to conclude that the criterion of "significant differences".

 The drawing shows a functional diagram of the device.

 The vehicle’s glass cleaning system consists of a brush drive electric motor 1, a washer pump electric motor 2, a time relay 3, a kind of operation switch 4, a washer solenoid valve 5, a glass dirty sensor 6, a first pulse generator 7, a matching circuit 8, four electronic keys 9, 10, 18, 19, trigger 12, second pulse generator 11, phase detector 13, low-pass filter 14, differentiating amplifier 15, comparator 16, amplifier 17.

 One pole of the type 4 switch is connected to the winding of the brush drive electric motor 1 and the output of the second electronic key 10, and the other two to the time relay 3, to which the output of the first electronic key 9 is connected, and the positive terminal of the power supply, to which the time relay 3 is also connected and a brush drive electric motor 1 connected to ground. The time relay 3 is connected to the windings of the electric motor of the washer pump 2 and the solenoid valve 5 of the washer. The first output of the second pulse generator 11 is connected to the input of the glass contamination sensor 6, the output of which is connected to the first input of the phase detector 13, the second output of the second pulse generator 11 is connected to the second input of the phase detector 13, the output of which is connected to the input of the low-pass filter 14, the filter output the low frequency is connected to the input of the differentiating "amplifier 15 and the input of the amplifier 17, the output of the differentiating amplifier 15 through a comparator is connected to the input of the third electronic key 18, the output of which is connected to the second the input of the matching circuit 8, the second input of the trigger 12 and the output of the fourth electronic key 19, the output of the amplifier 17 is connected to the input of the fourth electronic key 19. The output of the pulse generator 7 is connected to the second input of the matching circuit 8, the output of which is connected to the input of the first electronic key 9 and the first the trigger input 12. The direct output of the trigger 12 is connected to the input of the second electronic key 10 and the control input of the fourth electronic key 19, and the inverse output of the trigger 12 is connected to the control input of the third electronic key 18.

 The glass cleaning system operates as follows.

 In position 1 of the switch 4 of the kind of operation, the time relay 3 is turned on and the voltage from it is supplied to the washer pump electric motor 2 and to the washer valve 5. Valve 5 is activated and fluid from the pump is supplied to the glass. Time relay 3 creates a time delay for turning off the washer engine 2.

 After the relay 3 is activated, the switch 4 of the kind of operation can be turned off, further power to the motor 2 occurs through the contacts of the relay 3 time. In position P of the switch 4 of the kind of work, the voltage from it is supplied to the brush drive motor 1. The electric motor 1 stops working when the brush is installed in the extreme right position. That is, the cleaning system operates in manual mode in a standard way.

 The power of the glass contamination sensor 6 comes from the first output of the second pulse generator 11, the signal from the glass contamination sensor 6 goes to the first input of the phase detector 13. From the second output of the second pulse generator 11, the reference voltage is supplied to the second input of the phase detector 13. The use of phase detection allows to reduce the level of influence of pickups and illumination of the sensor 6 pollution of glass oncoming vehicles. A signal proportional to the contamination of the glass through a low-pass filter 14, separating the doubled harmonic of the second pulse generator 11 and reducing voltage ripples, is supplied to the differentiating amplifier 15 and amplifier 17. The output voltage of the differentiating amplifier 15, proportional to the rate of change of the glass pollution, is fed to the comparator 16 , the triggering level of which determines the critical rate of change in the contamination of the glass at which the cleaning system is triggered.

 From the output of the comparator 16, the signal through the electronic key 18 is fed to the first input of the matching circuit 8 and the second input of the trigger 12. The signal from the output of the first pulse generator 7 is fed to the second input of the matching circuit 8. If there are signals from the output of the comparator 16 and the pulse from the first pulse generator 7, a signal appears at the output of the matching circuit 8, which is input to the key 9. The key 9 is opened and the signal from the output of the key 9 is sent to the time relay 3. The time relay 3 is turned on, its contacts are closed and the voltage from it is supplied to the washer pump electric motor 2 and to the washer valve 5. Washer valve 5 is activated and fluid from the pump is supplied to the glass. In addition, the signal from the comparator 16 is fed to the second input of the trigger 12, and the signal from the coincidence circuit 8 to its first input. The trigger 12 is tipped over with the arrival of the first pulse from the coincidence circuit 8 and the signal from its direct output goes to the input of the key 10. The key 10 is opened and the voltage is supplied to the wiper motor 1, which starts to work.

 After a certain delay, the relay 3 turns off the motor 2 and the washer valve 5.

 The signal from the direct output of the trigger 12 opens the electronic key 19. At the same time, a signal proportional to the level of contamination of the glass is received at the input of the matching circuit 8 from the output of the amplifier 17 through the public key 19. The signal proportional to the rate of change in the level of contamination is turned off, since the electronic key 18 will close, since a low voltage will be established at the inverse output of the trigger 12. The cleaning system enters the cleaning mode according to the level of contamination.

 If during the period of time determined by the 7 pulse generator, the glass did not clean, then the next pulse is received from the coincidence circuit 8 and the washer cycle is repeated. The wiper continues to work until the glass is cleaned, in connection with which the signal from the sensor 6 stops, the trigger 12 capsizes, the motor 1 stops working. When the trigger 12 is tipped over, the electronic key 18 opens, and the key 19 closes and the cleaning system goes into standby mode according to the rate of change in the glass contamination.

 Thus, the device provides immediate and automatic activation of the cleaning system in case of sudden contamination of the vehicle glass when the driver loses the visibility of the road. The system works until the final cleaning of the glass occurs, since in this mode the system works according to the level of contamination. In the event that cleaning did not occur in one cycle of the washer operation, the washer cycle is repeated. The brush drive motor 1 stops working only after final cleaning of the glass. After cleaning, the device enters the operation mode according to the rate of change in contamination, which eliminates the operation of the cleaning system that is unexpected for the driver.

Sources of information taken into account during the examination:
1. USSR author's certificate N 822463, IPC B 60 S 1/08, 1981.

 2. USSR author's certificate N 1731667, IPC B 60 S 1/30, 1992.

 3. Copyright certificate of the USSR N 1523433, IPC B 60 S 1/00, 1989.

Claims (1)

 A vehicle glass cleaning system comprising a brush drive electric motor, a washer electric motor and a solenoid valve, a time switch, a type of operation switch, a glass dirty sensor, a first pulse generator, first and second electronic keys, a trigger and a matching circuit, wherein one pole of the type of operation switch is connected with the winding of the brush drive motor and the output of the second electronic key, and the other two with the time relay to which the output of the first electronic key is connected, and with a positive terminal of the power source, to which the time relay and the brush drive motor are also connected, connected to ground, and the time relay is connected to the windings of the electric motor and the washer solenoid valve, the output of the first pulse generator is connected to the second input of the matching circuit, the output of which is connected to the input the first electronic key and the first input of the trigger, the second input of which is connected to the first input of the matching circuit, and the direct output of the trigger is connected to the input of the second electronic key, characterized in that it is additionally equipped with a second pulse generator, a phase detector, a low-pass filter, a differentiating amplifier, a comparator, an amplifier, a third and fourth electronic keys, the first input of the second pulse generator connected to the input of the glass contamination sensor, the output of which is connected to the first input of the phase detector, the second the output of the second pulse generator is connected to the second input of the phase detector, the output of the phase detector is connected to the input of the low-pass filter, the output of the low-pass filter connected to the input of the differentiating amplifier and the input of the amplifier, the output of the differentiating amplifier through a comparator is connected to the input of the third electronic key, the output of which is connected to the first input of the matching circuit, the second input of the trigger and the output of the fourth electronic key, the output of the amplifier is connected to the input of the fourth electronic key, direct output the trigger is connected to the control input of the fourth electronic key, and the inverse output of the trigger is connected to the control input of the third electronic key.