Patent US2320629A successfully refreshed from Google Patents.
EP0288779A2
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EP
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Transmission clutch loop transfer control
Assignee: Ford-Werke GmbH
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Filing: 1988-04-01
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Granted: —
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Expires: 2008-04-01
Abstract
Abstract A method for controlling the transfer of load from one friction element to another friction element while making a gear ratio change in an automatic transmission. The synchronous engine speed is increased by slipping the offgoing clutch. A constant is calculated from known speed ratios of the gear set, engine inertia, the difference in engine speed from synchronous speed and a constant that corresponds to the output torque at the end of the torque phase of the gear ratio shift. The time rate of change of the offgoing clutch torque is calculated and the clutch pressures are changed in accordance with the calculated torque slope.
Inventors
- 👤 Larry T. Brown
- 👤 Davorin D. Hrovat
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 11:39
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/04; F16H61/06; F16H61/061; F16H61/68; F16H61/684; F16H61/688; F16H3/00; F16H3/02; F16H3/08; F16H3/087; F16H3/093; F16H2003/0931; F16H2061/0075; F16H2061/0078; F16H2061/0477; F16H2200/00; F16H2200/003; F16H2200/0052; F16H2306/00; F16H2306/40; F16H2306/44; F16H2306/52; F16H3/006; Y; Y10; Y10S; Y10S475/00; Y10S475/904; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
A method for controlling the exchange of load from a first friction element to a second friction element of an automatic transmission, adapted for driveable connection to an engine, the friction elements being selectively engaged and disengaged in accordance with the magnitude of hydraulic pressure supplied to the clutches comprising: increasing the engine speed to a first predetermined speed by increasing the slip across the first friction element to a first predetermined slip; calculating the CTCT transfer constant c₁ from the relationship; determining the pressure of the first friction element when the slip of the first reaches the first predetermined slip; and calculating the slope k p of the pressure ramp for the first friction element from the relationship
Claim 2
Independent Claim
119 words
A method for controlling the exchange of load from a first friction element to a second friction element of an automatic transmission, adapted for driveable connection to an engine, the friction elements being selectively engaged and disengaged in accordance with the magnitude of hydraulic pressure supplied to the clutches comprising: increasing the engine speed to a first predetermined speed by increasing the slip across the first friction element to a first predetermined slip; calculating the CTCT transfer constant c₁ from the relationship; determining the pressure of the first friction element when the slip of the first reaches the first predetermined slip; and calculating the slope k p of the pressure ramp for the first friction element from the relationship
Claim 3
Independent Claim
233 words
A method for controlling the exchange of load from a first friction element to a second friction element of an automatic transmission, adapted for driveable connection to an engine and containing a multiple speed ratio gearset, the friction elements being selectively engaged and disengaged in accordance with the magnitude of hydraulic pressure supplied to the friction elements to produce the various speed ratios, comprising: determining the rotational inertia I of the engine and other rotating components of the drivetrain upstream of the transmisssion gearset, the gearset speed ratios downstream of the offgoing friction element the gearset speed ratios upstream of the offgoing friction element the slip ΔN e (0) or the difference between the engine speed at the beginning of the exchange of load from the first friction element to the second friction element, the engine speed that corresponds to the current speed ratio and the vehicle speed, the torque applied as input to the transmission during the load exchange, and the value s′; increasing the engine speed to a first predetermined speed by increasing the slip across the first friction element to a first predetermined slip; calculating the CTCT transfer constant c₁ from the relationship determining the pressure of the first friction element when the slip of the first reaches the first predetermined slip; and calculating the slope K p of the pressure ramp for the first friction element from the relationship
Claim 4
Independent Claim
233 words
A method for controlling the exchange of load from a first friction element to a second friction element of an automatic transmission, adapted for driveable connection to an engine and containing a multiple speed ratio gearset, the friction elements being selectively engaged and disengaged in accordance with the magnitude of hydraulic pressure supplied to the friction elements to produce the various speed ratios, comprising: determining the rotational inertia I of the engine and other rotating components of the drivetrain upstream of the transmisssion gearset, the gearset speed ratios downstream of the offgoing friction element the gearset speed ratios upstream of the offgoing friction element the slip ΔN e (0) or the difference between the engine speed at the beginning of the exchange of load from the first friction element to the second friction element, the engine speed that corresponds to the current speed ratio and the vehicle speed, the torque applied as input to the transmission during the load exchange, and the value s′; increasing the engine speed to a first predetermined speed by increasing the slip across the first friction element to a first predetermined slip; calculating the CTCT transfer constant c₁ from the relationship determining the pressure of the first friction element when the slip of the first reaches the first predetermined slip; and calculating the slope K p of the pressure ramp for the first friction element from the relationship
Claim 5
Independent Claim
269 words
A method for controlling the exchange of load from a first friction element to a second friction element of an automatic transmission, adapted for driveable connection to an engine and containing a multiple speed ratio gearset, the friction elements being selectively engaged and disengaged in accordance with the magnitude of hydraulic pressure supplied to the friction elements to produce the various speed ratios, comprising: determining the rotational inertia I of the engine and other rotating components of the drivetrain upstream of the transmisssion gearset, the gearset speed ratios downstream of the offgoing friction element speed ratios upstream of the offgoing friction element the difference between the engine speed at the beginning of the exchange of load from the first friction element to the second friction element and the engine speed that corresponds to the current speed ratio and the vehicle speed N e , the torque applied as input to the transmission during the load exchange, and the value s′; calculating the time rate of change of torque of the offgoing friction element from the relationship k=c₁ T (0), where T off (0) is the engine torque; increasing the pressure of the second friction element at a time rate substantially equal to k(s′); concurrently decreasing the pressure of the first friction element at a time rate substantially equal to k; and reducing the pressure of the first friction element when the engine speed at the beginning of the exchange of load from the first friction element to the second friction element and the engine speed that corresponds to the current speed ratio and the vehicle speed becomes substantially equal.
Claim 6
Independent Claim
269 words
A method for controlling the exchange of load from a first friction element to a second friction element of an automatic transmission, adapted for driveable connection to an engine and containing a multiple speed ratio gearset, the friction elements being selectively engaged and disengaged in accordance with the magnitude of hydraulic pressure supplied to the friction elements to produce the various speed ratios, comprising: determining the rotational inertia I of the engine and other rotating components of the drivetrain upstream of the transmisssion gearset, the gearset speed ratios downstream of the offgoing friction element speed ratios upstream of the offgoing friction element the difference between the engine speed at the beginning of the exchange of load from the first friction element to the second friction element and the engine speed that corresponds to the current speed ratio and the vehicle speed N e , the torque applied as input to the transmission during the load exchange, and the value s′; calculating the time rate of change of torque of the offgoing friction element from the relationship k=c₁ T (0), where T off (0) is the engine torque; increasing the pressure of the second friction element at a time rate substantially equal to k(s′); concurrently decreasing the pressure of the first friction element at a time rate substantially equal to k; and reducing the pressure of the first friction element when the engine speed at the beginning of the exchange of load from the first friction element to the second friction element and the engine speed that corresponds to the current speed ratio and the vehicle speed becomes substantially equal.
References Cited (Backward Citations)
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