US3835733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine torque measuring apparatus providing an electrical control signal
Assignee: Robert Bosch GmbH
•
Filing: 1972-10-20
•
Granted: 1974-09-17
•
Expires: 1992-10-20
Abstract
Abstract A control valve which varies the hydraulic pressure of an automatic transmission in proportion to the engine torque, instead of being controlled by the intake manifold vacuum, is controlled by an electrical signal which is a composite of a signal proportional to engine speed, and a signal representative of the position of the accelerator pedal. Engine speed signals are derived from distributor signals, the speed signals then being modulated by a factor dependent upon the position of the accelerator pedal or of the throttle.
Inventors
- 👤 B Wurst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:07
CPC Classifications
G; G01; G01L; G01L3/00; G01L3/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
248 words
Apparatus to provide an electrical signal representative of torque of an internal combustion engine, to control electrical current flow through a magnet winding of a valve, comprising a first transducer means (23) responsive to the position ( Alpha ) of the throttle or of the accelerator pedal (14) of the engine, and providing a throttle position signal; second transducer means (25) measuring the speed of the engine shaft and providing a speed signal; a current controlled pressure regulator valve (22); and means (13) to generate an electrical resultant composite signal from said speed signal and said throttle signal to control current flow through said valve, in which the speed signal is modulated by the throttle signal, comprising an operational amplifier (52) and an output transistor (73) controlled by the operational amplifier; the operational amplifier having a direct input (51) connected to a combined output of said first and second transducer means (23, 25) and an inverting input (59); the transistor (73) being connected in series with said current controlled pressure regulator valve (22); means (78) deriving a signal representative of actual current flow in the transistor (73) and said valve (22); means (75) feeding back said valve current signal to the inverting input (59) of the operational amplifier (52) to provide for comparison of the actual current flow through said valve and commanded output signal; and an operational amplifier feedback circuit (71, 72) interconnecting the output (65) of the operational amplifier (52) and the inverting input (59) thereof.
Claim 2
Dependent Claim
248 words
Apparatus to provide an electrical signal representative of torque of an internal combustion engine, to control electrical current flow through a magnet winding of a valve, comprising a first transducer means (23) responsive to the position ( Alpha ) of the throttle or of the accelerator pedal (14) of the engine, and providing a throttle position signal; second transducer means (25) measuring the speed of the engine shaft and providing a speed signal; a current controlled pressure regulator valve (22); and means (13) to generate an electrical resultant composite signal from said speed signal and said throttle signal to control current flow through said valve, in which the speed signal is modulated by the throttle signal, comprising an operational amplifier (52) and an output transistor (73) controlled by the operational amplifier; the operational amplifier having a direct input (51) connected to a combined output of said first and second transducer means (23, 25) and an inverting input (59); the transistor (73) being connected in series with said current controlled pressure regulator valve (22); means (78) deriving a signal representative of actual current flow in the transistor (73) and said valve (22); means (75) feeding back said valve current signal to the inverting input (59) of the operational amplifier (52) to provide for comparison of the actual current flow through said valve and commanded output signal; and an operational amplifier feedback circuit (71, 72) interconnecting the output (65) of the operational amplifier (52) and the inverting input (59) thereof.
Claim 3
Dependent Claim
95 words
Apparatus according to claim 1, wherein the operational amplifier (52) is coupled (74) to the base of the output transistor (73); the valve is connected in series with the emitter-collector path of the transistor (73); said means deriving an actual flow signal comprises a resistor (78) in series with said emitter-collector path; and the means feeding back said actual current flow signal comprises a second resistor (75) connected between the junction of said resistor (78) and the series circuit including said emitter-collector path, said resistor being connected to the inverting input of said operational amplifier.
Claim 4
Dependent Claim
18 words
Apparatus according to claim 1, wherein the operational amplifier feedback circuits comprises a parallel connected R/C circuit (71,72).
Claim 5
Dependent Claim
59 words
Apparatus as defined in claim 1 in which said first transducer means (23,46) and said second transducer means (25,41) are such as to provide an output in the form of an electrical voltage, and in which said means (13) for generating an electrical resultant signal is an electrical evaluation circuit (24,26) in which said transducer means (46,41) are interconnected.
Claim 6
Dependent Claim
31 words
Apparatus as defined in claim 1 in which said first transducer means is a resistance potentiometer (46) mechanically connected to the throttle or to the accelerator pedal (14) of said motor.
Claim 7
Dependent Claim
104 words
Apparatus as defined in claim 5 in which said second transducer means (25) includes limiting means for limiting voltage peaks and protecting said apparatus against inadvertent reverse connection, comprising a first diode (36) between the input (12) of said second transducer means (25) and the negative supply conductor (35) of a voltage source serving said apparatus and a second diode (34) connected between said input (12) of said second transducer means (25) and the positive supply conductor (33) of said voltage source, and in which said first and said second diodes (36,34) are connected in the blocking direction with respect to said voltage source.
Claim 8
Dependent Claim
31 words
Apparatus as defined in claim 1 in which the input of said second transducer means (41) is connected to an iGnition interrupter contained in an ignition distributor (11) of said motor.
Claim 9
Dependent Claim
80 words
Apparatus as defined in claim 7 in which said second transducer means (25) comprises a rectifier (38), a charging capacitor (41) and a discharge resistor (42), in which said rectifier (38) is connected between the input (12) of said second transducer means and the ungrounded terminal of said charging capacitor (41) and that the output (37) of said second transducer means (25) is connected to a filter circuit (53,44,45) for smoothing the output voltage of said second transducer means (25).
Claim 10
Dependent Claim
32 words
Apparatus as defined in claim 1 in which said pressure regulator valve (22) is located in the hydraulic or pneumatic control circuit of at least one transmission coupling of a motor vehicle.
Claim 11
Dependent Claim
36 words
Apparatus as defined in claim 9 in which said pressure regulator valve is arranged to operate in the hydraulic or pneumatic control circuit of at least one main valve arranged to control a mechanical power transmission.
Claim 12
Dependent Claim
23 words
Apparatus as defined in claim 10 in which said hydraulic or pneumatic control circuit of said main valve is an anticipatory control circuit.
Claim 13
Dependent Claim
33 words
Apparatus as defined in claim 1 in which said first transducer means, said second transducer means and said means (13) for generating an electrical resultant signal are housed in a single compact casing.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |