US3882740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling the working oil pressure as a function of engine torque for shifting elements of automatically shifted transmissions, especially for motor vehicles
Assignee: Daimler Benz AG
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Filing: 1972-06-30
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Granted: 1975-05-13
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Expires: 1992-06-30
Abstract
Abstract A method and apparatus for controlling the working oil pressure as a function of torque for shifting elements of automatically shifted change-speed transmissions, in which electric logic circuit networks are provided between the shifting elements and transmitter means producing characteristic values representative of function magnitudes such as engine rotational speed, etc.
Inventors
- 👤 Hans-Joachim M Forster
- 👤 Hans Steinbrenner
- 👤 Georg Eltze
- 👤 Hans-Jorg Florus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:42
CPC Classifications
B; B60; B60W; B60W30/00; B60W30/18; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W2510/00; B60W2510/06; B60W2510/0657; B60W2710/00; B60W2710/10; B60W2710/1005; F; F16; F16H; F16H61/00; F16H61/0021; Y; Y10; Y10S; Y10S477/00; Y10S477/902
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
119 words
A method for controlling the working oil pressure as a function of torque of an engine for shifting elements of automatically shifted change-speed transmissions comprising the steps of producing a signal having a value representative of torque of the engine, producing at least one function magnitude sigNal having a value representative of at least one operating characteristic of one of the transmission and the engine, applying the torque signal and the at least one function magnitude signal to logic circuits for controlling the torque signal in accordance with the function magnitude signal to provide an output signal, and applying the output signal to the shifting element for controlling the working oil pressure for the shifting elements of the transmission.
Claim 2
Independent Claim
119 words
A method for controlling the working oil pressure as a function of torque of an engine for shifting elements of automatically shifted change-speed transmissions comprising the steps of producing a signal having a value representative of torque of the engine, producing at least one function magnitude sigNal having a value representative of at least one operating characteristic of one of the transmission and the engine, applying the torque signal and the at least one function magnitude signal to logic circuits for controlling the torque signal in accordance with the function magnitude signal to provide an output signal, and applying the output signal to the shifting element for controlling the working oil pressure for the shifting elements of the transmission.
Claim 3
Dependent Claim
31 words
A method according to claim 1, characterized in that the function magnitude signal is representative of at least one of transmission output rotational speed, engine rotational speed, and transmission oil temperature.
Claim 4
Dependent Claim
32 words
A method acccording to claim 1, characterized in that a plurality of function magnitude signals are produced and are representative of transmission output rotational speed, engine rotational speed, and transmission oil temperature.
Claim 5
Dependent Claim
44 words
A method according to claim 2, characterized by the steps of measuring the torsion of a crankshaft of the engine for detecting the torque and feeding the measured signal value to the electric logic circuits together with the at least one function magnitude signal.
Claim 6
Dependent Claim
68 words
A method according to claim 2, characterized by the steps of measuring the working pressure in at least one cylinder of the engine as well as the piston travel for determining the torque, combining both measured values with one another for forming a signal value indicative of torque and feeding this torque signal value to the electric logic circuits together with the at least one function magnitude signal.
Claim 7
Dependent Claim
36 words
A method according to claim 2, characterized in that a function magnitude signal is produced which is representative of the transmission output rotational speed plus the ratio of engine rotational speed to transmission output rotational speed.
Claim 8
Dependent Claim
45 words
A method according to claim 6, characterized by the steps of measuring the torsion of a crankshaft of the engine for detecting the torque and feeding the measured torque signal value to the electric logic circuits together with the at least one function magnitude signal.
Claim 9
Dependent Claim
68 words
A method according to claim 6, characterized by the steps of measuring the working pressure in at least one cylinder of the engine as well as the piston travel for determining the torque, combining both measured values with one another for forming a signal value indicative of torque and feeding this torque signal value to the electric logic circuits together with the at least one function magnitude signal.
Claim 10
Independent Claim
153 words
An apparatus for controlling the working oil pressure as a function of torque of an engine for shifting elements of automatically shifted change-speed transmissions, characterized by characteristic value transmitter means including first value transmitter means responsive to at least one operating characteristic of at least one of the engine and transmission for producing a signal representative of torque of the engine and second value transmitter means responsive to at least one operating characteristic of at least one of the engine and transmission for producing at least one function magnitude signal representative of at least one other operating characteristic, logic circuit means being connected to the first and second value transmitter means for controlling the torque signal in accordance with the at least one function magnitude signal to provide an output signal to a shifting element of the transmission, the shifting element being responsive to the output signal for controlling the working oil pressure.
Claim 11
Independent Claim
153 words
An apparatus for controlling the working oil pressure as a function of torque of an engine for shifting elements of automatically shifted change-speed transmissions, characterized by characteristic value transmitter means including first value transmitter means responsive to at least one operating characteristic of at least one of the engine and transmission for producing a signal representative of torque of the engine and second value transmitter means responsive to at least one operating characteristic of at least one of the engine and transmission for producing at least one function magnitude signal representative of at least one other operating characteristic, logic circuit means being connected to the first and second value transmitter means for controlling the torque signal in accordance with the at least one function magnitude signal to provide an output signal to a shifting element of the transmission, the shifting element being responsive to the output signal for controlling the working oil pressure.
Claim 12
Dependent Claim
35 words
An apparatus according to claim 9, characterized in that the second value transmitter means include means producing signals representative of at least one of transmission output rotational speed, engine rotational speed, and transmission oil temperature.
Claim 13
Dependent Claim
61 words
An apparatus according to claim 9, characterized in that the engine is provided with a crankshaft, in that the first value transmitter means includes means for measuring the torsion of the craNkshaft for producing the torque signal and further including means for feeding the measured value signal to the logic circuit means together with the at least one function magnitude signal.
Claim 14
Dependent Claim
87 words
An apparatus according to claim 9, characterized in that the first value transmitter means includes means for measuring the working pressure in at least one cylinder of the engine as well as the travel of a piston within the cylinder for, means for combining both measured values with each other for forming an average value signal representative of torque of the engine of and further including means for feeding said last-mentioned value signal to the logic circuit means together with the at least one function magnitude signal.
Claim 15
Dependent Claim
42 words
An apparatus according to claim 9, characterized in that the second value transmitter means includes means producing a function magnitude signal which is representative of the transmission output rotational speed plus the ratio of engine rotational speed to transmission output rotational speed.
Claim 16
Dependent Claim
138 words
An apparatus according to claim 9, characterized in that the engine is provided with a crankshaft and in that the first value transmitter means includes means for measuring torque which includes two gears, of which one is arranged near one end of the crankshaft and the other near the other end of the crankshaft, the number of teeth of one gear being a multiple of the number of teeth of the other gear, in that pulse circuit means, bistable multivibrator means and filter means are provided, the teeth of each gear controlling the pulse circuit means producing pulses fed to one respective input of the bistable multivibrator means having two inputs and an output, the output of the bistable multivibrator means being fed to the filter means forming an average value signal representative of torque of the engine.
Claim 17
Dependent Claim
24 words
An apparatus according to claim 14, characterized in that one gear is the starter gear and the other gear is the timing control gear.
Claim 18
Dependent Claim
61 words
An apparatus according to claim 9, characterized in that function former means are connected in the output of first value transmitter means, the output of the function former means being fed to adding amplifier means and the output of the adding amplifier means being fed to a further operational amplifier means whose output signal is substantially proportional to the torque curve.
Claim 19
Dependent Claim
18 words
An apparatus according to claim 16, characterized in that the further operational amplifier means is a multiplier means.
Claim 20
Dependent Claim
19 words
An apparatus according to claim 16, characterized in that the further operational amplifier means is a quotient former means.
Claim 21
Dependent Claim
34 words
An apparatus according to claim 16, characterized in that the characteristic values in the output of the function former means are corrected prior to application thereof to the input of the adding amplifier means.
Claim 22
Dependent Claim
107 words
An apparatus according to claim 9, characterized in that the engine has a crankshaft and at least one cylinder and the first value transmitter means includes a pressure characteristic value transmitter means detecting the pressure progress in the cylinder of the engine for the detection of the average indicated pressure, a piston position characteristic value transmitter means for the detection of the position of a piston in the cylinder, a multiplier means, a low-pass filter means, both transmitter means being connected to feed their outputs to the multiplier means, and in that the low-pass filter means is provided for integrating the output signal of the multiplier means.
Claim 23
Dependent Claim
34 words
An apparatus according to claim 20, characterized in that the piston position characteristic value transmitter means includes a coil fixed relative to the engine, into which immerses an iron core secured at the piston.
Claim 24
Dependent Claim
48 words
An apparatus according to claim 20, characterized in that the piston position characteristic value transmitter means includes an eccentric on the outside of the engine which rotates in unison with the crankshaft of the engine, and in that the eccentric actuates aN iron core immersing in a coil.
Claim 25
Dependent Claim
26 words
An apparatus according to claim 20, characterized in that the piston position characteristic value transmitter means indicates the crank angle of the crankshaft of the engine.
Claim 26
Dependent Claim
63 words
An apparatus according to claim 23, characterized in that a substantially reniform cam disk rotates in unison with the crankshaft whose edge at least a portion of covers a slot means depending on the position of the cam disk, and that a photocell is provided on one side of the slot means and a lamp on the other side of the slot means.
Claim 27
Dependent Claim
20 words
An apparatus according to claim 23, characterized by a carrier frequency means for detecting the edge of the cam disk.
Claim 28
Dependent Claim
142 words
An apparatus according to claim 20, characterized in that a pulse circuit means is provided producing a pulse during each rotation of the crankshaft, and an AND stage is provided whose one input is connected with the pulse circuit means and whose other input is connected with the pressure characteristic value transmitter means, the input of a bistable multivibrator means being controlled by the output of the AND stage and the other input of the multivibrator means being controlled by said pulse circuit means, a switching means being controlled by the output of the multivibrator means and having two further inputs, the pressure characteristic value transmitter means being connected to one further input of the switching means and an inverted pressure characteristic value signal being applied to the other input thereof, and integrating means connected in the output of the switching means.
Claim 29
Dependent Claim
59 words
An apparatus according to claim 9, characterized in that the first value transmitter means includes means providing a signal proportional to a rectangular signal derived from a control device for an electronic injection system and feeding the signal to an integrating amplifier means and a peak value rectifier means is connected to the output of the integrating amplifier means.
Claim 30
Dependent Claim
21 words
An apparatus according to claim 27, characterized in that the integrating amplifier means is a keyed amplifier reset after each pulse.
Claim 31
Dependent Claim
103 words
An apparatus according to claim 9, characterized in that a low-pass filter means and a quotient former means are provided and in that the first value transmitter means includes means providing a signal proportional to a rectangular signal derived from a control device for an electronic injection system and feeding the signal to the low-pass filter means producing in its output an output voltage U ti. n which is fed to an input of the quotient former means, and an engine rotational speed characteristic value transmitter means providing a voltage proportional to engine rotational speed to another input of the quotient former means.
Claim 32
Dependent Claim
30 words
An apparatus according to claim 29, characterized in that a linearizing function former means is connected between the engine rotational speed characteristic value transmitter means and the quotient former means.
Claim 33
Dependent Claim
36 words
An apparatus according to claim 29, characterized in that an adding amplifier means which is connected in the another input of the quotient former means, has several inputs to which are fed other function magnitudes signal.
Claim 34
Dependent Claim
150 words
An apparatus according to claim 9, characterized in that first and second low-pass filter means, a differentiating element, a difference amplifier means and an operational amplifier means are provided and in that the first value transmitter means includes means providing a signal representative of a rectangular signal derived from a control device for an electronic injection system and feeding the signal by way of the first low-pass filter means to one input of the difference amplifier means, an engine rotational speed transmitter means operating in pulsed operation being connected to the differentiating element, a monostable multivibrator means being connected in the output of the differentiating element, an on-off switch means being connected in the output of the monostable multivibRator means which keys the operational amplifier means, and the second low-pass filter means being provided between the output of the operational amplifier means and another input of the difference amplifier means.
Claim 35
Dependent Claim
74 words
An apparatus according to claim 9, characterized in that the logic circuit means includes an A.C. generator means, monostable multivbrator means, and amplifier means, the A.C. generator means controlling the monostable multivibrator means which produces pulses of predetermined duration, the multivibrator means including a second input which is fed with a voltage proportional to the torque, and the output of the multivibrator means controlling the amplifier means which in turn controls the shifting element.
Claim 36
Dependent Claim
84 words
An apparatus according to claim 9, characterized in that the logic circuit means includes a frequency generator means, a monostable multivibrator means and an amplifier means and in that a voltage signal proportional to torque is applied to the logic circuit means and is applied to the input of the frequency generator means producing a frequency as a function of applied voltage signal, the generator means controlling the monostable multivibrator means whose output is fed to the amplifier means which controls the shifting element.
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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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |