Electric circuit for selecting operational conditions of load

• US 4,075,501 A
• Filed: 09/04/1975
• Issued: 02/21/1978
• Est. Priority Date: 09/30/1974
• Status: Expired due to Term

• Current Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Kondo, Yoshihiko
• Primary Examiner(s): Schaefer, Robert K.
• Assistant Examiner(s): Feldhaus, John J.
• Application Number:
  US05/610,437
• Time in Patent Office: 901 Days
• Field of Search: 307/29, 307/38, 307/39, 307/40, 307/41, 328/20, 328/25, 317/139, 317/140, 318/562, 318/102, 318/103, 318/DIG. 2, 340/167 R, 340/168 A, 340/168 B
• US Class Current: 307/41
• CPC Class Codes: B60Q 1/20 Fog lights
• CPC Class Codes: B60R 16/0315 using multiplexing techniques multiplexing for transmission of signals G08C15/00; multiplexing for electrical communication in general H04J
• CPC Class Codes: B60S 1/0807 using electronic control means, e.g. tubes, semiconductors B60S1/0818, B60S1/0896 take precedence
• CPC Class Codes: Y10S 318/02 Windshield wiper controls

Abstract

A wiper switch is connected to a wiper motor through a relay switch and further to a switch condition discrimination circuit which produces a trigger signal when the wiper switch is actuated from the closed state to the opened state and again to the closed state within a fixed time. A multivibrator is connected to the switch condition discrimination circuit and begins to oscillate upon receiving the trigger signal. The relay switch connected between the wiper motor and the wiper switch is actuated to open when receiving the oscillation pulses from the multivibrator, whereby the wiper motor is intermittently supplied with the electric power to perform the intermittent wiper operation.

Claims

1. An electric circuit for selecting operational conditions of loads comprising:

an operational switch to be connected to a source of current;

a relay switch including at least one relay coil and one movable relay contact having a terminal to be connected to a load;

a trigger pulse generating circuit, connected to said operational switch, for producing a trigger pulse when said operational switch is at least once actuated from the closed state to the opened state and again to the closed state within a fixed time; and

a switching circuit, connected to said trigger pulse generating circuit, for actuating said relay switch upon receiving said trigger signal whereby the operationaL condition of said load is changed from one to the other condition, including means for generating a train of pulses at a fixed frequency in response to said trigger signal, means for coupling said pulses to said relay coil for intermittently shifting said contact to a position disconnecting said load from said source of current.

2. An electric circuit for selecting operational conditions of loads comprising;

a source of current;

an operational switch connected to said source of current;

a first load connected to said operational switch and energized when said operational switch is closed;

a second load connected to said source of current through a relay contact;

a switch condition discriminator circuit, connected to said operational switch, for producing a trigger signal when said operational switch is actuated from the closed to the opened and again to the closed state within a fixed time; and

a switching circuit, connected to said switch condition discriminator circuit, for actuating said relay contact to close upon receiving said trigger signal, thereby to energize said second load.

3. A wiper control circuit comprising;

a source of current;

a wiper switch connected to said source of current;

a wiper motor;

a switch condition discriminator circuit, connected to said wiper switch, for producing a trigger signal when said wiper switch is actuated from the closed state to the opened state and again to the closed state within a fixed time;

a pulse generator, connected to said switch condition discriminator circuit, for producing pulses upon receiving said trigger signal;

a relay contact, connected between said wiper switch and said wiper motor, for supplying electric power to said wiper motor when closed;

a relay coil for actuating said relay contact to open in response to said pulses, whereby said wiper motor is supplied with the electric power intermittently in response to the closure of said relay contact to perform the intermittent wiper operation.

4. A wiper control circuit comprising;

a source of current;

a wiper switch connected to said source of current;

a wiper motor for operating a windshield wiper blade;

a relay switch connected between said wiper switch and said wiper motor and including a relay coil and a normally closed relay contact actuated to open by the energization of said relay coil;

a first monostable multivibrator connected to said wiper switch and including a first and a second transistors;

a second monostable multivibrator connected to said source of current and including a third and a fourth transistors;

a first differentiation circuit, connected between said wiper switch and the base of said third transistor, for producing a trigger signal to said third transistor for driving it into nonconduction when said wiper switch is actuated from the closed to the opened state;

a second differentiation circuit, connected between the base of said first transistor and the collector of said third transistor, for producing a trigger signal to said first transistor for driving it into nonconduction when said third transistor becomes conductive; and

a third differentiation circuit, connected between said base of said third transistor and the collector of said first transistor, for producing a trigger signal to said third transistor for driving it into nonconduction when said first transistor becomes conductive;

said fourth transistor being driven into conduction when said third transistor becomes nonconductive;

said relay coil being connected to said fourth transistor and energized when said fourth transistor becomes conductive.

5. An electric circuit for selecting operational conditions of loads comprising;

a source of current;

a manually-operated switch connected to said source of current;

a load having at least two operational states;

a first means for generating a first pulse having a fixed pulse width in synchronism with the actuation of said manually-operated switch;

a second means for generating a second pulse having a pulse width which corresponds to the actuation time of said manually-operated switch;

a third means for detecting whether said second pulse is generated in the fixed period determined by said first pulse;

a fourth means for generating a signal in response to the detection of said third means; and

a fifth means for selectively driving said load in response to said signal of said fourth means.

6. An electric circuit for selecting operational conditions of loads comprising;

a source of current;

a manually-operated switch connected to said source of current;

a plurality of loads;

a first means for generating a first pulse having a fixed pulse width in synchronism with the actuation of said manually-operated switch;

a second means for generating a second pulse having a pulse width which corresponds to the actuation time of said manually-operated switch;

a third means for detecting whether said second pulse is generated in the fixed period determined by said first pulse;

a fourth means for generating a signal in response to the detection of said third means; and

a fifth means for selectively driving said loads in response to said signal of said fourth means.

7. A method for selectively driving a load comprising the steps of;

actuating a manually-operated switch;

generating a first pulse having a fixed pulse width in synchronism with the actuation of said manually-operated switch;

generating a second pulse having a pulse width which corresponds to the actuation time of said manually-operated switch;

detecting whether said second pulse is generated in the fixed period determined by said first pulse; and

generating a third pulse in response to the detection of the last said means; and

driving selectively a load in response to said third pulse.

8. An electric circuit for selecting operational conditions of electric loads comprising:

an operational switch having a manually-operated movable contact adapted to be selectively actuated to either a first position or a second position;

discrimination means, connected to said operational switch, for discriminating whether said movable contact is actuated from said first position to said second position and again to said first position within a predetermined time interval or not;

pulse generation means, connected to said discrimination means, for generating a train of pulse signals at a fixed frequency in response to the output signal of said discrimination means indicating that said movable contact is actuated from said first position to said second position and again to said first position within said predetermined time interval, and

selection means, adapted to operatively connect an electric load with a source of electric power while said movable contact is kept actuated to said first position, for selecting the operational condition of said electric load, said selection means constantly connecting and intermittently connecting said electric load with said source of electric power while said pulse signals are not generated and generated, respectively, to thereby select either the continuous operation or the intermittent operation of said electric load with said movable contact of said operational switch actuated to said first position.

9. An electric circuit according to claim 8, wherein said discrimination means includes:

a monostable circuit, connected to said operational switch, for producing a pulse signal having the time width equal to said predetermined time interval when said movable contact is actuated from said first position;

a detection circuit, connected to said operational switch, for producing a detection signal when said movable contact is actuated to said first position; and

a logic circuit, connected to said monostable circuit and said detection circuit, for producing the output signal when said detection signal is generated during the time width of said pulse signal, said output signal indicating that said movable contact is actuated from said first position to said second position and again to said first position within said predetermined time interval.

10. An electric circuit according to claim 9, wherein said operational switch is connected between said source of power and said selectron means, for constantly connecting the latter with the former while said movable contact is kept actuated to said first position and constantly disconnecting the latter from the former while said movable contact is kept actuated to said second position.