US5335568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control for a motor vehicle drive having an automatic transmission
Assignee: Siemens AG
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Filing: 1992-08-28
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Granted: 1994-08-09
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Expires: 2012-08-28
Abstract
Abstract A motor vehicle drive has an engine and an automatic transmission. A control for the motor vehicle drive includes an engine control for controlling a variable influencing torque of the engine and a transmission control for controlling shifting events of the transmission and for transmitting an intervention signal initiating a shifting event to the engine control. The transmission control includes a first device for ascertaining a current transmission input torque, a memory for storing torque values being maximally allowable during a shifting event, as a function of engine rpm and shifting type, a second device for comparing the current transmission input torque with the maximum allowable torque value at any given time and ascertaining a proportion by which the engine torque is to be varied during the shifting event, and a pulse former circuit for converting the proportion into a pulse modulated signal to be transmitted to the engine control as a control signal for controlling a variation in the engine torque during the shifting event.
Inventors
- 👤 August Kammerl
- 👤 Friedrich Graf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/11; B60W30/00; B60W30/18; B60W30/1819; F; F16; F16H; F16H59/00; F16H59/02; F16H59/08; F16H2059/082; F16H2059/084; F16H2059/085; F16H2059/087; F16H63/00; F16H63/40; F16H63/50; F16H63/502
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
197 words
In a motor vehicle drive having an engine producing torque and an automatic transmission, a control for the motor vehicle drive, comprising: an engine control for controlling a variable influencing the torque of the engine; and a transmission control for controlling shifting events of the transmission, said transmission control having means for generating and for transmitting an intervention signal to the engine control for initiating a shifting event, said transmission control including: a first device for ascertaining a current transmission input torque, a memory for storing torque values being maximally allowable during a shifting event, as a function of engine rpm and shifting type, a second device connected to said first device and to said memory for comparing the current transmission input torque with the maximum allowable torque value at any given time and ascertaining a proportion by which the engine torque is to be varied during the shifting event, and a pulse former circuit connected to said second device and to said engine control for converting the proportion into a pulse modulated signal to be transmitted to said engine control as a control signal for controlling a variation in the engine torque during the shifting event.
Claim 2
Dependent Claim
197 words
In a motor vehicle drive having an engine producing torque and an automatic transmission, a control for the motor vehicle drive, comprising: an engine control for controlling a variable influencing the torque of the engine; and a transmission control for controlling shifting events of the transmission, said transmission control having means for generating and for transmitting an intervention signal to the engine control for initiating a shifting event, said transmission control including: a first device for ascertaining a current transmission input torque, a memory for storing torque values being maximally allowable during a shifting event, as a function of engine rpm and shifting type, a second device connected to said first device and to said memory for comparing the current transmission input torque with the maximum allowable torque value at any given time and ascertaining a proportion by which the engine torque is to be varied during the shifting event, and a pulse former circuit connected to said second device and to said engine control for converting the proportion into a pulse modulated signal to be transmitted to said engine control as a control signal for controlling a variation in the engine torque during the shifting event.
Claim 3
Dependent Claim
44 words
The control according to claim 1, wherein the control signal has an amplitude including information regarding a proportion by which the engine torque is varied, and the control signal has a length including information regarding a duration of a variation in the engine torque.
Claim 4
Dependent Claim
21 words
The control according to claim 1, wherein the control signal is transmitted in the form of a pulse width modulated signal.
Claim 5
Dependent Claim
17 words
The control according to claim 1, wherein the control signal is transmitted as a digitally encoded signal.
Claim 6
Dependent Claim
30 words
The control according to claim 1, wherein said second device has a linking member with a protective function, for forwarding the larger of two signals as the torque variation proportion.
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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) | 1997-08-08 | 1998-02-07 | 1998-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-08 | 2002-02-07 | 2002-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-08 | 2006-02-07 | 2006-08-09 | $7700.00 | Window Closed / Lapsed |