GB1522521A – Electric windscreen wiper systems
– Google Patents
GB1522521A – Electric windscreen wiper systems
– Google Patents
Electric windscreen wiper systems
Info
Publication number
GB1522521A
GB1522521A
GB1975475A
GB1975475A
GB1522521A
GB 1522521 A
GB1522521 A
GB 1522521A
GB 1975475 A
GB1975475 A
GB 1975475A
GB 1975475 A
GB1975475 A
GB 1975475A
GB 1522521 A
GB1522521 A
GB 1522521A
Authority
GB
United Kingdom
Prior art keywords
motor
motors
signals
level
contact
Prior art date
1976-04-30
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1975475A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Motors Ltd
Original Assignee
General Motors Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1976-04-30
Filing date
1976-04-30
Publication date
1978-08-23
1976-04-30
Application filed by General Motors Ltd
filed
Critical
General Motors Ltd
1976-04-30
Priority to GB1975475A
priority
Critical
patent/GB1522521A/en
1978-08-23
Publication of GB1522521A
publication
Critical
patent/GB1522521A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G01—MEASURING; TESTING
G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
G01P3/42—Devices characterised by the use of electric or magnetic means
G01P3/56—Devices characterised by the use of electric or magnetic means for comparing two speeds
B—PERFORMING OPERATIONS; TRANSPORTING
B60—VEHICLES IN GENERAL
B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
B60S1/00—Cleaning of vehicles
B60S1/02—Cleaning windscreens, windows or optical devices
B60S1/04—Wipers or the like, e.g. scrapers
B60S1/06—Wipers or the like, e.g. scrapers characterised by the drive
B60S1/08—Wipers or the like, e.g. scrapers characterised by the drive electrically driven
B60S1/0814—Wipers or the like, e.g. scrapers characterised by the drive electrically driven using several drive motors; motor synchronisation circuits
H—ELECTRICITY
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
H02P5/50—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another by comparing electrical values representing the speeds
Abstract
1522521 Automatic control of D.C. motors GENERAL MOTORS Ltd 30 April 1976 [10 May 1975] 19754/75 Heading H2L A windscreen wiper system comprises a pair of closely similar D.C. motors A, B each driving a respective wiper arm and blade assembly and each controlled by an identical transistor amplifier and switching circuit 28, 32, whose transistors 34 are controlled by signals a, b produced by a logic circuit 10 of a quad two input NAND gate type, Fig. 2 (not shown), the inputs to circuit 10 being signals A, B which are produced by respective switches associated with the motors A, B, each switch consisting of the sectored and segmented plate of Fig. 4 which rotates with a gear wheel driven by the motor and engages or disengages a contact (not shown) to produce a 1 or 0 level signal respectively, the circuit of Fig. 1 operating to maintain the motors in synchronism by virtue of the following features:- (1) If signals A, B have the same level (i.e. 0 or 1), signals a, b are both 1 and transistors 50 are switched on to energize the motors. (2) If signal A or B changes from level 0 to 1 before the signal B or A, the signal a or b changes to level 0 to switch off the transistor 50 of the faster motor, which then slows down or stops until the signal of the slower motor changes from level 0 to 1, whereupon the faster motor is re-energized. (3) To prevent the slower motor being switched off when the signal of the faster motor changes from level 1 to 0, which could result in the slower motor being stopped until the faster motor has rotated to cause its plate sector to re-engage its contact, each plate has a segment S positioned as shown and of such length that, if the corresponding motor is de-energized as its contact engages segment 5, the inertia of the motor is sufficient to ensure continued rotation until the contact disengages segment S. Thus, if motor A is the faster the interaction of signals A, B, produced by engagement and disengagement of the respective sectors, segments and contacts, will result in two successive energization/re-energization operations of motor B and one such operation of motor A if its contact is engaging segment S when the contact of motor B disengages its sector. When the aforementioned sequence is completed both motors are running for a further speed correction as in (2) above. Conventional parking switches for each motor ensure that:- (1) signals A and B are at the same level when a switch 20 is closed, so that the motors are simultaneously switched on, and (2) the circuit of Fig. 1 may be applied to control two-speed three-brush motors braked, when switched off, by short circuiting of the armature.
GB1975475A
1976-04-30
1976-04-30
Electric windscreen wiper systems
Expired
GB1522521A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB1975475A
GB1522521A
(en)
1976-04-30
1976-04-30
Electric windscreen wiper systems
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB1975475A
GB1522521A
(en)
1976-04-30
1976-04-30
Electric windscreen wiper systems
Publications (1)
Publication Number
Publication Date
GB1522521A
true
GB1522521A
(en)
1978-08-23
Family
ID=10134654
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1975475A
Expired
GB1522521A
(en)
1976-04-30
1976-04-30
Electric windscreen wiper systems
Country Status (1)
Country
Link
GB
(1)
GB1522521A
(en)
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4881019A
(en)
*
1986-04-30
1989-11-14
Nissan Motor Co., Ltd.
Wiper control system for automotive vehicle facilitated front and rear wipers
US5166587A
(en)
*
1991-11-12
1992-11-24
Deere & Company
Windshield wiper control system responsive to vehicle speed
US5256950A
(en)
*
1990-11-29
1993-10-26
Asmo Co., Ltd.
Windshield wiper assembly and synchronous signal generating device for windshield wiper
1976
1976-04-30
GB
GB1975475A
patent/GB1522521A/en
not_active
Expired
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4881019A
(en)
*
1986-04-30
1989-11-14
Nissan Motor Co., Ltd.
Wiper control system for automotive vehicle facilitated front and rear wipers
US5256950A
(en)
*
1990-11-29
1993-10-26
Asmo Co., Ltd.
Windshield wiper assembly and synchronous signal generating device for windshield wiper
US5166587A
(en)
*
1991-11-12
1992-11-24
Deere & Company
Windshield wiper control system responsive to vehicle speed
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Legal Events
Date
Code
Title
Description
1978-12-20
PS
Patent sealed
1983-12-21
732
Registration of transactions, instruments or events in the register (sect. 32/1977)
1991-01-02
PCNP
Patent ceased through non-payment of renewal fee
