US3857043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interlock circuit for blocking operation of starter motor of a combustion engine
Assignee: Robert Bosch GmbH
•
Filing: 1973-01-15
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Granted: 1974-12-24
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Expires: 1993-01-15
Abstract
Abstract A voltage produced by the rotation of the armature of the starter motor of a combustion engine is used to control the operation of a threshold switch for cutting off or blocking the operation of the starter motor. A voltage produced by the generator driven by the engine is used only to block operation of the starter motor when the engine is running and the starter motor already stopped. The signal from the generator is provided directly to a cut-off relay through a diode as well as indirectly through an OR-gate at the input of the threshold switch to which the voltage signal from the starter motor itself is also furnished. A storage capacitor is used to prevent premature reactivation of the starter.
Inventors
- 👤 A Habasch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:32
CPC Classifications
F; F02; F02N; F02N11/00; F02N11/08; F02N11/0848; F02N11/10; F02N11/101; F02N11/105
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
256 words
An interlock system for cutting off or blocking the operation of the starter motor of a combustion engine, comprising: a battery; a generator (38) for charging said battery coupled to said engine so as to be driven thereby; an engine ignition switch connected to one pole of said battery; a starter motor having an armature winding and at least one stator winding; a manual starter switch connectable to said battery through said engine ignition switch and connected in circuit with said starter motor; an electrically controlled starter switch means (14, 15) in circuit with said starter motor and said starter switch, and means for blocking operation of said electrically controlled starter switch means in response to voltage generated in a winding of said starter motor (10) by the revolution of said armature of said starter motor (10) when said starter motor is running and to the voltage generated by the revolution of the rotor of said generator (38) when said starter motor is quiescent, said blocking means including OR-gate means having one input responsive to said voltage generated by revolution of said armature of said starter motor while said starter motor is energized, threshold switch means responsive to said OR-gate means, circuit breaker means for breaking the operating circuit of said electrically controlled starter switch means and circuit means interconnecting said threshold switch means and said circuit breaker means and having delay means for prolonging operation of said circuit breaker means for a predetermined interval after return of said threshold switch means to its quiescent condition.
Claim 2
Dependent Claim
256 words
An interlock system for cutting off or blocking the operation of the starter motor of a combustion engine, comprising: a battery; a generator (38) for charging said battery coupled to said engine so as to be driven thereby; an engine ignition switch connected to one pole of said battery; a starter motor having an armature winding and at least one stator winding; a manual starter switch connectable to said battery through said engine ignition switch and connected in circuit with said starter motor; an electrically controlled starter switch means (14, 15) in circuit with said starter motor and said starter switch, and means for blocking operation of said electrically controlled starter switch means in response to voltage generated in a winding of said starter motor (10) by the revolution of said armature of said starter motor (10) when said starter motor is running and to the voltage generated by the revolution of the rotor of said generator (38) when said starter motor is quiescent, said blocking means including OR-gate means having one input responsive to said voltage generated by revolution of said armature of said starter motor while said starter motor is energized, threshold switch means responsive to said OR-gate means, circuit breaker means for breaking the operating circuit of said electrically controlled starter switch means and circuit means interconnecting said threshold switch means and said circuit breaker means and having delay means for prolonging operation of said circuit breaker means for a predetermined interval after return of said threshold switch means to its quiescent condition.
Claim 3
Dependent Claim
52 words
An interlock system as defined in claim 1 in which the armature (11) of said starter motor (10) is connected for energization only in sseries with a stator winding of said motor and in which one input of said OR-gate means is responsive to the armature voltage of said starter motor (10).
Claim 4
Dependent Claim
46 words
An interlock system as defined in claim 1 in which said one input of said OR-gate means is responsive to a change of voltage in a stator winding of said starter motor (10) which is caused by the revolution of said armature of said starter motor.
Claim 5
Dependent Claim
54 words
An interlock system as defined in claim 1 in which said threshold switch means (34) comprises a differential amplifier to one input of which a portion of the output voltage of said battery is provided as a reference voltage and to the other input to which the output of said OR-gate means is provided.
Claim 6
Dependent Claim
78 words
An interlock system as defined in claim 4 in which when the threshold voltage of said threshold switch (34) is reached, said circuit breaker means (35, 36, 37) is actuated in response to the output voltage of one of the transistors (47, 50) included in said differential amplifier and the actuation of said circuit breaker means interrupts the control circuit of a control switch (19, 20) in the current supply circuit of said electrically controlled starter switch means.
Claim 7
Dependent Claim
65 words
An interlock system as defined in claim 5 in which said delay means includes a storage element (62) arranged to be charged after the operation of said threshold switch means (34) and thereby to hold said circuit breaker means (35, 36, 37) operated and said control circuit open for a predetermined period after the return of said threshold switch means (34) to its unoperated condition.
Claim 8
Dependent Claim
99 words
An interlock system as defined in claim 6 in which said storage element (62) is also arranged to be charged in response to a signal produced by the opening of said control switch (19, 20) in the current supply circuit of said electrically controlled starter switch means (14, 15) so that said storage device (62) may hold said circuit breaker means (35, 36, 37) operated for a predetermined period and thereby block for said period the control circuit of said control switch (19, 20) provided in said current supply circuit of said electrically controlled starter switch means (14, 15).
Claim 9
Dependent Claim
83 words
An interlock system as defined in claim 1 in which said interconnecting circuit means includes: a first transistor (58) arranged to be responsive to the operation of said differential amplifier having output electrode connected to a capacitor (62) included in said delay means; a second transistor (64) having its control electrode connected to said capacitor (62); a third transistor (67) adapted to be activated by said second transistor and adapted to activate the operating circuit (35) of said circuit breaker means (35,36, 37).
Claim 10
Dependent Claim
40 words
An interlock system as defined in claim 8 in which said first transistor (58) has a control electrode connected by circuit means to the control circuit of said electrically controlled starting switch means and responsive to reverse voltage peaks thereof.
Claim 11
Dependent Claim
62 words
An interlock system as defined in claim 9 in which said control electrode of said first transistor (58) is connected over the switching path of a fourth transistor (78), over diodes (76, 77, 73) and resistors (75, 72) and over the switching path of a fifth transistor (74) to the said control circuit of said electrically controlled starting switch means (14, 15).
Claim 12
Dependent Claim
67 words
A interlock system as defined in claim 10 in which said fourth transistor (78) has a base electrode connected with a capacitor (79) which is connected to the voltage of said battery when said control circuit of said electrically controlled starting switch means (14, 15) is energized, whereby as said capacitor approaches its charged condition a switching of said fourth transistor into its conducting condition is produced.
Claim 13
Dependent Claim
39 words
An interlock system as defined in claim 1 in which a direct electrical connection is provided through a diode between the output of said generator (38) and the operating circuit (35) of said circuit breaker means (35, 36, 37).
Claim 14
Dependent Claim
70 words
An interlock system as defined in claim 1 in which a starter gear magnet for engaging said starter motor with said engine is provided with an activating winding and a holding winding and in which said holding winding is energized in parallel with the control circuit of said electrically controlled starter switch means and said activating winding is activated through a switching path of said electrically controlled starter switch means.
Claim 15
Dependent Claim
97 words
An interlock system as defined in claim 13 in which said electrically controlled starter switch means and said starter gear magnet are mechanically interlocked to provide a second operated position of said electrically controlled starter switch means after said starter gear magnet is activated such that with cooperation of contacts operated by said starter gear magnet, said starter motor is supplied reduced power in the first position of said electrically controlled switch means and full power in said second position and such that said activating winding is deenergized when said switch means is in its second position.
Claim 16
Dependent Claim
110 words
An interlock system as defined in claim 1, in which said starter motor has a stator winding arranged to be energized in series with its armature when full power is applied to said starter motor, the armature having a winding one end of which is connected in series with said stator winding as aforesaid and the other end of which is grounded to the motor structure, and in which system the connection of said armature winding to said stator winding is also connected to one input of said OR-gate means to provide thereto a voltage induced in said armature winding as the result of the revolution of said armature (11).
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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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |