Patent US4614903A successfully refreshed from Google Patents.
US4614903A
Expired / Lapsed
US
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Windshield wiper speed control arrangement
Assignee: ITT Inc
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Filing: 1984-09-14
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Granted: 1986-09-30
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Expires: 2004-09-14
Abstract
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.
Inventors
- 👤 Helmut Betsch
- 👤 Walter Bierent
- 👤 Gunther Gille
- 👤 Horst Goertler
- 👤 Hans Prohaska
- 👤 Horst Rachner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:36
CPC Classifications
B; B60; B60S; B60S1/00; B60S1/02; B60S1/04; B60S1/06; B60S1/08; B60S1/0803; B60S1/0807; Y; Y10; Y10S; Y10S15/00; Y10S15/15; Y10S318/00; Y10S318/02
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
121 words
In a circuit arrangement for a reversible electric motor for directly driving an element in pendulum-fashion between two reversing positions, especially a windshield wiper on motor vehicles, and wherein the polarity of the supply voltage for the motor is reversed in the reversing positions via a reversing switch or is switched off in a parking position, the improvement comprising: a switching stage for controlling energization of said motor such that the rotational speed of said motor is reduced in predetermined angular ranges, said motor is operated at reduced rotational speed in defined angular ranges before each reversing position and the size of said angular range before said parking position or said reversing position is variable in dependence on certain measured parameters.
Claim 2
Dependent Claim
121 words
In a circuit arrangement for a reversible electric motor for directly driving an element in pendulum-fashion between two reversing positions, especially a windshield wiper on motor vehicles, and wherein the polarity of the supply voltage for the motor is reversed in the reversing positions via a reversing switch or is switched off in a parking position, the improvement comprising: a switching stage for controlling energization of said motor such that the rotational speed of said motor is reduced in predetermined angular ranges, said motor is operated at reduced rotational speed in defined angular ranges before each reversing position and the size of said angular range before said parking position or said reversing position is variable in dependence on certain measured parameters.
Claim 3
Dependent Claim
28 words
A circuit arrangement in accordance with claim 1, wherein: said electric motor is operated at reduced rotational speed in a defined angular range before reaching a parking position.
Claim 4
Dependent Claim
25 words
A circuit arrangement in accordance with claim 2, wherein: said motor is operated at reduced rotational speed in defined angular ranges before each reversing position.
Claim 5
Dependent Claim
31 words
A circuit arrangement in accordance with claim 2, wherein: said motor is operated at reduced rotational speed in a defined angular range after leaving a parking position or a reversing position.
Claim 6
Dependent Claim
31 words
A circuit arrangement in accordance with claim 3, wherein: said motor is operated at reduced rotational speed in a defined angular range after leaving a parking position or a reversing position.
Claim 7
Dependent Claim
51 words
A circuit arrangement in accordance with claim 5, wherein: said switching stage includes a plurality of series resistors and each of said series resistors is arranged parallel to a switching path of a controllable switching element and that, in said defined angular ranges said switching path is open, but closed otherwise.
Claim 8
Dependent Claim
47 words
A circuit arrangement in accordance with claim 6, wherein: said switching stage includes a plurality of position switches and said switching element is controlled by switching signals which are directly or indirectly released by said position switches which are actuated by said motor in predetermined angular positions.
Claim 9
Dependent Claim
69 words
A circuit arrangement in accordance with claim 7, wherein: said switching stage includes means for generating a switching-off signal to stop said motor through an operating switch and after switching-off of said operating switch, said motor is stopped in said parking position, said switching-off signal of said operating switch only being effective when said switching element is previously controlled such that the rotational speed of said motor is reduced.
Claim 10
Dependent Claim
31 words
A circuit arrangement in accordance with claim 1, wherein: said motor is operated at reduced rotational speed in a defined angular range after leaving a parking position or a reversing position.
Claim 11
Dependent Claim
31 words
A circuit arrangement in accordance with claim 1, wherein: said motor is operated at reduced rotational speed in a defined angular range after leaving a parking position or a reversing position.
Claim 12
Dependent Claim
23 words
A circuit arrangement in accordance with claim 1, wherein: said parameters are the motor supply voltage and the rotational speed of said motor.
Claim 13
Dependent Claim
27 words
A circuit arrangement in accordance with claim 1, wherein: in said predetermined angular ranges, the rotational speed of said motor is variable by several steps or continuously.
Claim 14
Dependent Claim
31 words
A circuit arrangement in accordance with claim 12, wherein: said switching stage varies the supply voltage for the motor or the pulse width of the voltage pulses conducted to the motor.
Claim 15
Dependent Claim
28 words
A circuit arrangement in accordance with claim 12, wherein: said switching stage connects different series resistors into the motor circuit to vary the rotational speed of said motor.
Claim 16
Dependent Claim
30 words
A circuit arrangement in accordance with claim 14, wherein: at least one of said series resistors may be connected into the circuit between a reversing switch and a motor terminal.
Claim 17
Dependent Claim
70 words
A circuit arrangement in accordance with claim 15, wherein: said reversing switch has two change-over bridging contacts connected with said motor of which each may be operated by a switching relay and of which each co-operates with two stationary contacts connected with said voltage source, and that, in the reversing positions, said relays are successively controlled with a time delay via limit switches which may be actuated by said motor.
Claim 18
Dependent Claim
30 words
A circuit arrangement in accordance with claim 14, wherein: at least one of said series resistors may be connected into the circuit between a voltage source and said reversing switch.
Claim 19
Dependent Claim
70 words
A circuit arrangement in accordance with claim 17, wherein: said reversing switch has two change-over bridging contacts connected with said motor of which each may be operated by a switching relay and of which each co-operates with two stationary contacts connected with said voltage source, and that, in the reversing positions, said relays are successively controlled with a time delay via limit switches which may be actuated by said motor.
Claim 20
Dependent Claim
97 words
A circuit arrangement in accordance with claim 1, wherein: after switching-off of said motor the actual parking position of said element is determined and compared with a desired position, the angular difference between said parking position and said desired position is stored in a memory as a correction value; and in dependence on said correction value at least one of the following steps occurs; said motor is switched off at differing angular positions; the angular range is changed with reduced rotational speed; said motor is acted upon by a pulse of reverse polarity of differing pulse duration.
Claim 21
Dependent Claim
22 words
A circuit arrangement in accordance with claim 19, wherein: said correction value is only determined when said motor is intially switched on.
Claim 22
Dependent Claim
23 words
A circuit arrangement in accordance with claim 20, wherein: said correction value is determined in each cycle and evaluated in the following cycle.
Claim 23
Dependent Claim
57 words
A circuit arrangement, in accordance with claim 1 comprising: timing elements; circuit elements; an arbitrarily actuable operating switch having a plurality of switching positions to selectively couple said circuit elements to said timing elements to determine the delay time of said timing elements, said timing elements being retardedly controlled one after the other via said reversing switch.
Claim 24
Dependent Claim
24 words
A circuit arrangement in accordance with claim 1, comprising: a brake circuit connectable to said motor, the effect of said brake circuit being variable.
Claim 25
Dependent Claim
26 words
A circuit arrangement in accordance with claim 23, comprising: at least one resistor inserted in the operating circuit, and the value of said resistor is variable.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |