Abstract: An apparatus for controlling a windshield wiper in accordance with the amount of rain falling on the windshield. The apparatus includes a rain sensor for detecting an amount of rain positioned thereon, a comparator for comparing the output of the rain sensor with one of first and second signals representing predetermined amounts of drops of water and producing a second output signal, a memory for memorizing the second output signal, an exchanger for exchanging one of the first and second signals for the other one, and an actuator for actuating the wiper at one of high and low wiping speeds. Further, the comparator produces an output according to whether the detected amount of rain is equal to or greater than one of the first and second predetermined amounts of drops of water.

Abstract: The control device comprises a manually operable switch and a system for controlling the stopping of the motor in a fixed position corresponding to a parking position of a windshield wiper. The system comprises an electrical circuit with at least one sliding contact intended to interact with at least one track having electrically conductive and isolating sectors, a relative rotary movement between the sliding contact and the track being controlled by the motor. One of the elements formed by the sliding contact and the track is intended to be connected to the supply terminal of the motor armature, while the other such element can be grounded during the rotary movement. Said one element is connected to the supply terminal of the motor by means of electrical breaker designed to remain open when the wiper motor is operating normally and close when the manual switch is actuated to control the stopping of the motor.

Abstract: An intermittent drive controller for a windshield wiper having a drive circuit for driving a wiper motor, a drive command circuit connected to the drive circuit by way of a semiconductor device, and a braking circuit related to the above circuits. When a wiper switch is operated, the wiper motor is driven, thereby starting the wiping movement of the wiper. When the wiper motor pauses, the motor switch outputs a pause signal, thereby instantly stopping the wiper motor. On the other hand, after a certain period of time has passed, a new drive command signal is supplied from the drive command circuit to the drive circuit, thereby driving the wiper motor again, thus effecting the intermittent drive control. This arrangement employs no electromagnetic relays so that it is free from noise which may generate when the wipe motor starts or stops and from malfunctions due to imperfect contact, thus improving the durability.

Abstract: A wiper control apparatus includes a main relay switch for passing the voltage received from a power supply to make the wiper control apparatus operable, an ignition switch for passing the voltage from the power supply to make the vehicle operable, and control means for controlling the ON/OFF operation of the main relay switch. The control means operates in response to the conductive state of the ignition switch to render the main relay switch conductive. After a predetermined time in response to a cut-off state of the ignition switch, the control means renders the main relay switch non-conductive. The predetermined time allows the wiper blade to move down to a predetermined park position of a windshield after the ignition switch is turned off.

Abstract: A windshield wiper system includes two windshield wipers of which each is mounted on a separate wiper shaft and may be driven to and fro by a separate motor between an inner reversing position and an outer reversing position, which windshield wipers are at least partially superposed in their inner reversing position and rotate in opposite directions through one wiping cycle. The two windshield wipers are moved without collision even though they wipe an overlapping area. The first windshield wiper is driven by its associated motor with a greater angular velocity of the output shaft than the second windshield wiper is driven by its motor. In addition the first windshield wiper is stopped for a predetermined time in its inner reversing position between two wiping cycles.

Abstract: A wiper control system having a timing circuit for operating the wiper a predetermined time after the operation of the liquid spray pump commences operation and continues a predetermined time after the liquid spray pump stops. The system operates the wiper at high speed in the washer mode and in one embodiment changes to high speed and in another embodiment changes to low speed upon operation of the wiper to the off mode.

Abstract: The present invention relates to an apparatus and a method for controlling a wiper which detects the amount of rain positioned on a rain sensor regardless of the wiping speed of wipers and which smoothly moves the wipers at different wiping speeds in accordance with the detected amount of rain. The apparatus for controlling the wiper includes the rain sensor, a first comparator, an actuator, a second comparator, a timer, a memory and a changing device. The rain sensor is located on an exterior surface of a front windshield of a vehicle and detects the amount of rain which is positioned on the rain sensor. The wiper wipes off an exterior surface of the front windshield and moves from and returns to an initial position.

Abstract: The invention relates to driving mechanism for wiper blades of, for example, motor vehicles wherein two motors (14, 15) impart to the wiper arm, or to at least one of its elements, not only an oscillating, but also a translational (radial) movement. The oscillating movement is imparted to the wiper arm by means of a drive shaft (12) actuated by a first motor (14) and the radial movement is imparted to the wiper arm by means of the drive shaft (13) of a second motor (15) and by means of a conical gear (9a, 9b) associated with a screw/nut system (8, 7) wherein the nut (7) moves radially when the drive shaft (13) of the second motor (15) is rotating. The two movements of the wiper arm are controlled and regulated by an opto-electronical system comprising two slotted discs (14a, 15a), two reading heads (14b, 15b) and a micro-processor (19). Several embodiments of the invention are possible.

Abstract: The invention is directed to an automatic wiper control circuit for operating window wipers automatically when moisture is sensed. The control circuit additionally provides for increasing the speed of a dual speed wiper motor when a high level of moisture is detected. The system comprises a moisture sensor which senses moisture thereon. A circuit associated with the moisture sensor converts the moisture level to DC voltage. At a preselected level of this DC voltage the wiper motor operates in one of its two different speeds. A lack of a predetermined amount of moisture terminates the wiper motor operation. If the control circuit terminates the wiper motor action during wiper sweep, the normal homing circuit of the wiper motor continues to operate the motor until the wiper blade or blades reach the wiper blade home position. Sequential illumination of a plurality of light emitting diodes (LEDS) occur during a wiping cycle when the circuit is operating normally.

Abstract: A rain sensor for selectively supplying power from a constantly available power source to a wiper means (14) to remove moisture from a vehicle window (12) when moisture has collected. A passive circuit (18) is supported on the window (12) and has an initial self-resonant frequency to sense moisture. A generating means (20,120) creates an electromagnetic field having a range of frequencies wherein the initial self-resonant frequency is within the range of frequencies. An moisture collects about the passive circuit (18), the resonant frequency of the passive circuit (18) shifts away from the initial self-resonant frequency, indicative of less coupling with the generating means (20,20). A detector (28,128) detects the coupling between the passive circuit (18) and the generating means (20,120) to actuate the wiper means (14) by a control means (30,130) when a predetermined decoupling magnitude is exceeded.

Abstract: A wiper driving unit for driving a wiper for a vehicle such as a motor vehicle includes: a driving gear driven by a motor, for driving the wiper; and a clutch member formed of a conductive resilient plate, rotatably supported and rotatable together with the driving gear in the biasing direction only when the driving gear is rotated in the biasing direction. An engageable member on the driving side is projectingly provided on the driving gear, and an engageable member on the driven side is connected in operational association to the clutch member. The engageable member on the driving side and the engageable member on the driven side are engaged with each other to rotate the driving gear together with the clutch member in the same direction only when the driving member is rotated in the biasing direction.

Abstract: A windshield wiper system for motor vehicles includes an electric motor which drives at least one wiper during normal wiper operation, too and fro between two reversing positions within a wiping area. When the wiper system has been switched off by means of an operating switch, the wiper is moved to a concealed parking position outside the wiping area. Upon switching on of the wiper system and during normal operation the motor runs in one direction of rotation, but for moving the wipers into the parking position the motor runs in the other direction of rotation. A position switch is changed over by a switching member coupled with a rotating drive member of the electric motor. The position switch, after the operating switch has been switched off, releases a signal for reversing the polarity and in the parking position releases a signal for switching off the electric motor.

Abstract: This concealed wiper system comprises a wiper motor (1) having a mechanism to house the wiper arm in the retracted position by reversing rotation of the wiper motor; an oscillator (50) in which the oscillation frequency is varied by means of a variable resistor (59) installed within the automobile compartment; a wiper actuation switch (3) for wiper actuation selection; a wiper motor-position detector (2) for detecting wiper motor output shaft position; a wiper motor drive circuit (6) for driving the wiper motor; and an intermittent actuation control device employing a microcomputer (5).Intermittent actuation is selected by means of said wiper actuation switch (3), the intermittent pause period is based upon signals from said wiper motor-position detector (2) and signals from said means of oscillation (50), said wiper motor drive circuit (6) is controlled by the microcomputer (5).

Abstract: An apparatus and a method for controlling a wiper which smoothly starts to move the wipers at different wiping speeds from an initial position thereof in accordance with a detected amount of rain. The apparatus includes a sensor, a first comparator, an actuator, a second comparator, a memory and a changing device.The sensor detects the amount of rain. The memory memorizes the second actuating signal outputted from the second comparator and the memory outputs the memorized signal. The changing device for changing the wiping speed of the wiper at the time when the wiper starts to move from the initial position in accordance with a memorized second actuating signal outputted from the memory at the time when the wiper starts to move from the initial position, the changing device changes a low wiping speed of the wiper to a high wiping speed or a high wiping speed of the wiper to a low wiping speed.

Abstract: A sensor for detecting a light-transmissible foreign object, such as a raindrop, attached on a transparent body, such as a windowglass of a vehicle includes a light source, a light receiving unit disposed on the inside of the transparent body, and a prism fixedly attached on the transparent body on the inside thereof and arranged in a manner so that the light emitted toward the transparent body from the light source is caused to advance through the prism to reach the light receiving unit and that the quantity of light received by the light receiving unit changes when a light-transmissible foreign object attaches on the outside of the transparent body. The prism includes a restriction surface for preventing external light which enters the prism through the transparent body from coming into the light receiving unit.

Abstract: A concealed wiper system comprises a wiper motor (1) having a mechanism to house a wiper arm in a retracted stop position by means of the reverse rotation of the wiper motor;a wiper actuation switch (3) with output capability which consists of a two-bit selection signal output from the selected switch positon;a wiper motor position detector (2) which detects data on wiper motor output shaft position, said detector output capability consisting of a two bit position signal determined by the position of said output shaft;a control means (4) consisting of a microcomputer which operates based upon said selection signals and position signals, said microcomputer also outputs both normal and reverse rotation signals; anda wiper motor drive circuit (6) which actuates said wiper motor in both normal and reverse rotation by means of signals from said control means.

Abstract: A control for an electrically powered, motor vehicle windshield wiper system with independent drive motors for the wiper blades which produces an opposing wiper pattern with overlapping park and which is simple and inexpensive to manufacture by providing a unique switching system which coordinates the blades to prevent interference therebetween and converts simply and effectively, when the system is turned off, to a blade parking control which allows continuation of normal blade movement into a predetermined park position. The control provides switch control for the motor of each wiper blade in response to certain predetermined positions of the other blade, including, in particular, a position adjacent but outside the wipe pattern of the other blade wherein the controlled blade may be stopped if necessary to avoid interference.

Abstract: A control for separately driven, potentially interfering wiper blades includes position sensors for each wiper blade and a memory which stores, for each pattern, numbers representing inner and outer wipe positions with acceleration, constant velocity and deceleration regions therebetween and a command velocity for the constant velocity regions. The memory further stores numbers defining a zone of potential blade interference and, for each position of each blade within this zone, a non-interference zone for the other blade. The control further includes closed loop velocity control apparatus responsive to the signals from the position sensors and the command velocity to maintain the command velocity in the constant velocity region, accelerate to the command velocity in the acceleration region and decelerate from the command velocity in the deceleration region.

Abstract: A precipitation sensor for detecting when a predetermined fraction of the sensor area is covered with water drops comprises an insulating substrate, a pair of spaced electrodes of conductive material on the substrate, and an array of conductive spots on the substrate between the electrodes, the spots being arranged to define an open circuit between the electrodes when the substrate is dry and a closed circuit when at least some of the spots are bridged by water drops. This sensor uses the physical principle of percolation to respond accurately to small amounts of precipitation and is preferably integrated in the wipe area of a windshield surface and is incorporated in the wiper control system.

Abstract: An automatic device for actuation of components for cleaning motor vehicle glass which includes a system for detection of the dirtiness of the glass, made up of a measuring photosensitive element receiving light directly through the glass and a reference photosensitive element isolated from any direct light and influenced only by the light transmitted through the interior of the glassing and an electronic circuit to receive and compare the responses of the two photosensitive elements and means to control the cleaning components automatically when the difference is response of these elements exceeds a certain threshold.

Abstract: Method and apparatus for controlling the intermittent speed of a windshield wiper. A multi-speed motor for operating the windshield wiper is adapted to react to a change in drag of the wiper to automatically switch the motor to a different intermittent rate according to the load condition that exists.

Abstract: An electronic control system for windshield wipers on motor vehicles for initiating wiping action in response to the occurrence and level of precipitation on the windshield. A sensor unit comprising a block containing an array of photo-sensors arranged in a bridge configuration and a corresponding array of light sources is mounted on the inside surface of the windshield at a location traversed by the path of the vehicle's windshield wiper blades. The photo-sensor elements are oriented to normally receive light reflected back from the glass/air interface at the outside windshield surface from the photo-emitters, but when rain is present on the windshield, the light rays are scattered to create an unbalanced condition. The unbalancing of the bridge creates a signal which is demodulated in a synchronous demodulator and then applied via an automatic gain control (AGC) circuit to a window comparator.

Abstract: In a circuit arrangement for a reversible electric motor for directly driving a windshield wiper the motor is operated at reduced rotational speed in predetermined angular ranges to ensure smooth starting and stopping in the reversing positions and an accurate parking position.

Abstract: A device for detecting the presence of water includes a capacitance sensor coupled to a windshield to detect capacitance changes. A multivibrator is coupled to the sensor to translate the detected capacitance change to the frequency domain. A phase-locked loop coupled to the multivibrator produces a phase pulse in response to water causing a change in capacitance and, in turn, a change in the frequency of the multivibrator.

Abstract: A wiper driving apparatus comprises a speed reduction gear train mounted on a drive shaft of a motor which drives reciprocally and pivotally a wiper blade; a pin member operatively engaged with said gear train so as to move once every rotation of the gear train; a relay switch driven by a relay coil and including a moving contact and fixed contacts disposed opposite sides of the movable contact; an operating lever member for transmitting the movement of the pin member to the movable contact of the relay switch and retaining contact of the movable contact with one of the fixed contacts; and a control circuit including the relay switch and the operating lever member for controlling the driving, intermittent, and automatic stop operations of the wiper blade.

Abstract: A wiper control system controls an automotive wiper in accordance with rain conditions. Rain conditions are detected by means of a rain sensor which has a vibrator adapted to vibrate at an amplitude corresponding to rain conditions. The vibrator is adapted to produce a sensor signal having an amplitude corresponding to its vibration. The vibrator vibrates at a resonant frequency outside of the audible frequency range and has adequate sensitivity for detecting rain conditions.

Abstract: A wiper device has a reversible electric motor having an output shaft operatively connected to a reciprocally movable wiper blade. The electric circuit including motor armature is constructed such that, when a wiper switch is on, the motor shaft is reciprocally rotated in alternate directions within a predetermined angular range less than 360.degree. to reciprocally drive the wiper blade and that, when the wiper switch is turned off, the motor shaft is rotated beyond the predetermined angular range to move the wiper blade to a rest position out of its wiping range.

Abstract: An automotive wiper control apparatus has an infrared emitting unit outside an occupant compartment, a photodetector unit inside the compartment in optical alignment with the infrared emitting unit, and an electric control for automatically controlling the wiper operation in dependence on the state in which infrared rays emitted by the infrared emitting unit through a predetermined area of the windshield are received by the photodetector unit. The photodetector unit has an infrared transmission plate formed of an infrared transmissive material and carrying infrared shielding layers applied in a striped pattern to one surface of the plate. The infrared transmission plate is disposed in front of a plurality of photodetectors so that a contrast is produced on the photodetectors by the infrared rays passing through the uncoated zones of the plate which are free from the infrared shielding layers. The contrast is varied with variation in the quantity of raindrops on the predetermined area of the windshield.

Abstract: An electro-optical liquid detector assembly comprises a transparent substrate attached at its front surface to a portion of the interior surface of a wind-shield where the exterior surface of the wind-shield is wiped by a wiper blade, a light emission element assembled within the substrate to emit luminous rays towards the wind-shield thereby to cause internal reflection of the luminous rays between the interior and exterior surfaces of the wind-shield, a light receiving element assembled within the substrate to receive the incident luminous rays reflected by the exterior surface of the wind-shield and to produce an electric signal indicative of an amount of the incident luminous rays, a transparent resilient sheet member interposed between the interior surface of the wind-shield and the front surface of the substrate, and a hoder fixedly mounted on a stationary member adjacent the periphery of the interior surface of the wind-shield to support the substrate thereon and press it towards the interior surface o

Abstract: A control method performed in response to the occurrence of an abnormal sensor output during the operation of monitoring the output signal of a sensor and controlling the operation of an automobile device such as a wiper. A microcomputer detects the presence or absence of an abnormal value of the sensor output signal converted to digital form so that when the abnormal value is detected, the operation of the automobile device is selectively controlled in accordance with an engine operating condition indicative signal applied to the microcomputer.

Abstract: A windshield wiper assembly comprising two windshield wipers each driven by a separate motor is described in which a control provides switching signals for switching on and off the wiper motors so as to achieve relatively smooth running of the wipers. In particular wiping areas one motor is continuously switched on and only the other motor, in dependence on the difference of the angular positions of the two wipers, is controlled such that collision of the wipers is prevented when the wiping areas overlap.

Abstract: A rain sensor for an automotive wiper control system detects rain conditions to produce a rain condition indicative signal. The rain sensor includes a vibrator, the outer surface of which is exposed to rain drops and which vibrates or oscillates at an amplitude and frequency corresponding to the energy applied by rain drops. The rain sensor is adapted to produce the rain condition indicative signals corresponding to the vibration amplitude of the vibrator. The vibrator is resiliently suspended within a sensor casing by means of a resilient member which is adapted to allow vibration of the vibrator as rain drops hit the outer surface and to absorb vibrational noises transmitted through the vehicle body. The resilent member simultaneously serves to waterproof the components within the sensor casing.

Abstract: A control system for a motor driven wiper on a vehicle window comprises a voltage generator effective to generate a first rectangular voltage wave having a substantially constant frequency and duty cycle and apparatus effective to derive two additional rectangular voltage waves from the first: a second delayed from the first by a first delay and a third delayed from the first by a second delay dependent upon the capacitance of a capacitor affected by moisture on the vehicle window. One of the second and third rectangular voltage waves may also be inverted. The three rectangular voltage waves are provided to the inputs of an AND gate having an output effective to trigger a retriggerable monostable multivibrator having an energized output period longer in duration than a cycle of the rectangular voltage wave to drive the wiper motor when the level of moisture on the window in the vicinity of the capacitor is sufficiently high.

Abstract: A stop-position controlling device for an electric windshield wiper is disclosed, which comprises an oscillation means for a wiper blade and a switch mechanism provide with armature shortcircuiting contacts for forcedly stopping the wiper blade at a predetermined position under a turn-off state of a wiper switch. In this device, the armature shortcircuiting contacts are shifted at plural positions for forcedly stopping the wiper motor at different positions and a turnover means is further arranged therefor, or a contact moving means is disposed for displacing the armature shortcircuiting contacts to plural positions.

Abstract: An apparatus for automatic activation and control of windshield wipers in response to moisture accumulation at the exterior surface of the windshield, including a pair of thin wires sandwiched within the windshield and positioned below the surface of the windshield to be cleared by the windshield wipers. The wires provide variable capacitance to a detection circuit, based on the amount of water occurring at the windshield surface. Activating circuitry is coupled to the detecting circuitry and wiper motor for initiating wiper action when capacitance measurement exceeds a predetermined reference standard.

Abstract: A windshield cleaner control for a vehicle in which signals from separate washer and wiper actuating switches in the vehicle passenger compartment are voltage multiplexed on a single electric conductor through the firewall to washer and wiper actuating circuitry in the vehicle passenger compartment. A wiper actuating path is established including, in series, a source of electric power, a wiper motor actuating coil relay, the park switch and the washer motor, the internal impedance of the actuating coil being sufficiently greater than that of the washer motor that the latter is not activated by current flow through the former. The parallel wiper and washer switches are connected in series between the source of electric power and the electric conductor, park switch and washer motor, but a resistor in series with the wiper switch similarly prevents activation of the washer motor by the wiper switch.

Abstract: In an intermittent windshield wiper system in which the time between wiping cycles depends upon the degree of dryness of the windshield and upon the speed of the wiper blades on the downstroke of the wiping cycle toward the dwell position of the wiper blades, a circuit is provided to regulate the speed of the motor on the down stroke making use of the same transistor device that is used in controlling the energization of the motor to achieve intermittent operation. The motor is a three-brush motor and speed regulation is achieved by deriving signals from one or two of the brushes and applying it to the input electrode of the transistor device. The regulated speed of the motor can be manually controlled to provide a manual adjustment to the sensitivity of the system to the degree of dryness of the windshield.

Abstract: In an automotive windshield wiper control system, a rain sensor provides a rain condition-indicative signal useful in controlling the wiper in its intermittent operation mode. That signal is integrated to yield a value representing rain accumulation on the windshield, and when the integrated value exceeds a given threshold, the wiper is reciprocated once to clear the windshield. In order to prevent arhythmic wiper operation, the signal integrator is disabled during wiper operation so that the integrated value will not approach the threshold too soon after or even before the end of the preceding wiper operation cycle.

Abstract: A wiper speed control system for an automotive wiper controls the operational speed of a wiper in accordance with rain conditions. The control system includes a rain sensor detecting rain conditions to produce an analog signal having an amplitude depending upon the detected rain conditions. The analog sensor signal is converted into a digital pulse signal by a converter for application to a digital circuit system. A control signal is produced by digitally processing the pulse signal. The control signal is applied to a wiper driver circuit to adjust the operational speed or timing in accordance with the control signal.

Abstract: A control system activates motor vehicle windshield wipers when an improved sensing element senses precipitation. The element comprises a thin, substantially planar sheet of electrically insulating material which is impervious to precipitation. First and second electrodes are secured to the sheet and in gapless contact therewith to form a precipitation sensing edge. The element is preferably supported at one end within the center of a trough formed within a holder to present the sensing edge to the atmosphere. The holder facilitates mounting and also protects the element from damage.

Abstract: A device for automatic adjustment of the frequency of activation of a motor vehicle windscreen wiper driven by a motor is described. The main characteristic of the device lies in the fact that it comprises circuit means which control the frequency of activation as a function of the quantity of water present on the surface which is wiped by the windscreen wiper.

Abstract: A windshield wiper control, e.g. for use in automobiles, receives information as to the amount of humidity on the windshield from a sensor (1) which is arranged within the area which is swept by the windshield wipers, and adjust the wiper frequency in relation thereto. The windshield wiper control includes a circuit (2) which remembers the signal from the sensor just after the windshield wiper has passed the sensor. The signal is compared to the signal directly from the sensor by a comparator (3). Having detected a certain change, the amplifier (4) is activated which turns on the wiper motor through a relay (5). The sensor may be of the capacitive type.

Abstract: A windshield wiper control system has operations controlled by single touch actuators. A first such actuator provides for initiation of wiper operation in low speed with the first actuation and alternate high and low speed operation with additional actuations. A second such actuator stops wiper operation and, if actuated while the wiper is not running, initiates a single wipe of the wiper. A further actuator may be provided for initiation of either programmed or operator controlled wash operation, depending on the length of actuation. A final actuator may be provided for two touch intermittent wiper operation, in which the operator sets the delay time by two consecutive touches. Variations are described for either depressed park or non-depressed park systems.

Abstract: For use in a motor vehicle having a windshield, a control system comprises a raindrop sensor which emits a beam of radiation into a section of the windshield from the inner surface thereof at such an angle of incidence that the beam reflects off the outer surface and detects the reflected beam to convert it into a first signal. The first signal is compared with a reference value to generate a second signal. A motor control circuit is responsive to the second signal for closing a window of the vehicle.

Abstract: A windshield wiper control device for use on a vehicle includes a light-emitting unit mounted on the vehicle outside of a compartment for emitting a ray of infrared radiation, a photodetector unit mounted on the vehicle within the compartment and having a slit plate for producing an image of a striped pattern with bright and dark areas in response to exposure to the ray of electromagnetic radiation through the windshield and an array of photodetectors for sensing the bright and dark areas of the striped image and generating signals indicative of the bright and dark areas, and an arithmetic circuit arrangement for computing a contrast of the bright and dark areas based on the signals from the photodetectors and controlling the speed and/or period of operation of the windshield wiper based on the computed contrast.

Abstract: A windshield wiper mechanism includes a motor driven gear and a drive plate positioned relative thereto but selectively rotatable to enable easy change of the effective wiper parts position. A park switch to automatically stops the arm and blade at a selected position on the windshield is located on the drive gear (driving rotatable member). Removal, rotation and reengagement of the drive plate relative to the motor driven gear then easily changes the wiper park position. The drive plate is provided with at least one opening located at a radial distance from the center rotating axis of the drive plate for receiving a pin of a connecting link that will provide oscillating motion to a shaft upon which a windshield wiper arm and blade is secured.

Abstract: A control circuit for a windshield wiper circuit provides for a depressed parking position by including a timing element which delays turn off of the motor for a time interval after the wiper reaches a position adjacent the parking position area.

Abstract: A wiper control device for a vehicle capable of accurately stopping wiper blades always at the lowermost position of a wiping range regardless of the rotating speed of a wiper motor. The wiper control device automatically stops the wiper motor at the lowermost position of the wiper blades with a control circuit which obtains a sliding angle corresponding to the rotating speed of the wiper motor from the rotating speed of the motor and controls to flow an electric current continuously in the motor during the time while the motor reaches a rotating position even after the motor is interrupted by selecting the cam contact position with respect to the annular electrode. Thus, this wiper control device can eliminate to disturb the visual field of a driver with the wiper blades.

Abstract: A device is disclosed for intermittent connection of a wiper drive motor to a power source. The device comprises first means for providing a control signal with its magnitude increased with increasing vehicle running speed, and second means for providing a first signal for a predetermined period of time and a second signal for a period of time variable according to the magnitude of the control signal. Means is provided for connecting the wiper drive motor to the power source in response to the first signal and for disconnecting the wiper drive motor from the power source in response to the second signal.

Abstract: A vehicle windshield cleaning system is disclosed which includes windshield wiper blades reciprocally driven by an electric motor, and an associated pump driven by an electric motor for dispensing windshield washing liquid onto a windshield to be cleaned. A manually positionable mode selector component in the electric control circuit for the blade and pump motors provides for selectively actuating the wiper blades in mist, pulse, low speed, high speed and wash modes. In the pulse mode, the blade drive motor is energized to intermittently oscillate the wiper blades through succeeding cycles with a time delay therebetween, and in the wash mode the pump motor is energized for a period of time which determines the amount of washer fluid dispensed onto a windshield.