US4770064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed gear change responsive engine torque reducing system
Assignee: Daimler Benz AG
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Filing: 1986-04-07
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Granted: 1988-09-13
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Expires: 2006-04-07
Abstract
Abstract A device is provided for reducing the engine torque when shifting a speed-change gear transmission connected downstream of an internal combustion engine. A final engine torque control element is connected to a control device which cause the final control element to reduce the engine torque dependent on certain operating conditions dictated by speed and load of the internal combustion engine and upon the occurrence of a switching signal, with interposition of at least one timing element. To obtain precise timing between shifting and engine intervention, the arrangement is made such that the switching signal is triggered synchronously to the torque reversal at a lockable reaction gear element of a planetary wheel gear involved in the shifting so as to cause the final control element to reduce the engine torque without any time delay.
Inventors
- 👤 Michael Kuerschner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:31
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/021; F02D41/0215; F02D41/022; F02D41/023; F16; F16H; F16H59/00; F16H59/68; F16H2059/6807; F16H2059/683; F16H63/00; F16H63/40; F16H63/50; F16H63/502
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
209 words
Control apparatus for controlling engine torque in response to gear shift changes in a speed change gear transmission of the type having a reaction gear element means which is selectively brakable by braking means during gear shift changes, said control apparatus comprising, switching control means for automatically generating a switching signal in direct response to torque reversal at the reaction gear elements means, and engine control element means for controlling changes in engine torque in response to said switching signal, said switching control means and engine control element means being operable to automatically control engine torque during shifting wherein said engine control element means includes: a first timing element actuable in response to a switching signal corresponding to a change from an unbraked to a braked condition of the reaction gear element means during one of upshifting and downshifting of the speed change gear transmission; a second timing element actuable in response to a switching signal corresponding to a change from a braked to an unbraked condition of the reaction gear element means during the other of upshifting and downshifting of the speed change gear transmission; and final control element means actuable by an output signal of one of said first and second timing elements to reduce engine torque.
Claim 2
Dependent Claim
209 words
Control apparatus for controlling engine torque in response to gear shift changes in a speed change gear transmission of the type having a reaction gear element means which is selectively brakable by braking means during gear shift changes, said control apparatus comprising, switching control means for automatically generating a switching signal in direct response to torque reversal at the reaction gear elements means, and engine control element means for controlling changes in engine torque in response to said switching signal, said switching control means and engine control element means being operable to automatically control engine torque during shifting wherein said engine control element means includes: a first timing element actuable in response to a switching signal corresponding to a change from an unbraked to a braked condition of the reaction gear element means during one of upshifting and downshifting of the speed change gear transmission; a second timing element actuable in response to a switching signal corresponding to a change from a braked to an unbraked condition of the reaction gear element means during the other of upshifting and downshifting of the speed change gear transmission; and final control element means actuable by an output signal of one of said first and second timing elements to reduce engine torque.
Claim 3
Dependent Claim
22 words
Control apparatus according to claim 1, wherein said reaction gear element means is a reaction wheel gear of a planetary gear unit.
Claim 4
Dependent Claim
24 words
Control apparatus according to claim 1, wherein said engine control element means includes means for reducing engine torque in response to said switching signal.
Claim 5
Dependent Claim
40 words
Control apparatus according to claim 3, wherein said engine control element means includes switching signal blocking means for blocking the switching signal to prevent reducing of the engine torque when the engine is not operating in its full load range.
Claim 6
Dependent Claim
43 words
Control apparatus according to claim 4, wherein said blocking means includes an AND element with an output connection to final engine torque control means and input connections with said switching signal and at least one engine load signal representative of engine load conditions.
Claim 7
Dependent Claim
101 words
Control apparatus according to claim 1, wherein said braking means operably brakes the reaction gear element means when said transmission is in an intermediate speed gear and is operably released from the reaction gear element means when said transmission is shifted from the intermediate speed gear to respective lower and higher speed gears, and wherein said engine control element means includes down-shift detection means operably connected to at least one of the timing elements so that the time period of torque reduction is shorter during a downshift from the intermediate speed gear than during an upshift from the intermediate speed gear.
Claim 8
Dependent Claim
24 words
Control apparatus according to claim 6, wherein said down-shift detection means includes a Schmitt trigger operable in response to changes in engine rotational speeds.
Claim 9
Dependent Claim
47 words
Control apparatus according to claim 6, further comprising time delay element means interposed between the downshift detection means and a reset input of one of the timing elements which has a set input connected to said switching signal corresponding to braking of the reaction gear element means.
Claim 10
Dependent Claim
24 words
Control apparatus according to claim 8, wherein said downshift detection means includes a Schmitt trigger operable in response to changes in engine rotational speeds.
Claim 11
Dependent Claim
49 words
Control apparatus according to claim 8, further comprising an AND element having an output connected to the time delay element means, a first input connected to the output of the downshift detection means, and a second input connected to the set input of the one of the timing elements.
Claim 12
Dependent Claim
24 words
Control apparatus according to claim 10, wherein said downshift detection means includes a Schmitt trigger operable in response to changes in engine rotational speeds.
Claim 13
Dependent Claim
27 words
Control apparatus according to claim 8, wherein said downshift detecting means is supplied with input signal from differentiating means responsive to rates of changes in engine speed.
Claim 14
Dependent Claim
41 words
Control apparatus according to claim 12, wherein said downshift detection means includes a Schmitt trigger operable in response to changes in engine rotational speeds, and wherein said differentiating means is operably disposed at the input side of the Schmitt trigger means.
Claim 15
Dependent Claim
49 words
Control apparatus according to claim 13, further comprising an AND element having an output connected to the time delay element means, a first input connected to the output of the downshift detection means, and a second input connected to the set input of the one of the timing elements.
Claim 16
Dependent Claim
36 words
Control apparatus according to claim 1, wherein said switching control means includes a pressure switch for generating the switching signal in response to hydraulic reaction pressure which is automatically generated upon actuation of said braking means.
Claim 17
Dependent Claim
32 words
Control apparatus according to claim 15, wherein said pressure switch is actuated by a brake actuation circuit including control valve means directly connected to a movable brake band of the braking means.
Claim 18
Dependent Claim
20 words
Control apparatus according to claim 1, wherein said engine control element means includes means for controlling the engine ignition system.
Claim 19
Dependent Claim
20 words
Control apparatus according to claim 1, wherein said engine control element means include means for controlling the engine fuel supply.
Claim 20
Dependent Claim
30 words
Control apparatus according to claim 1, wherein said switching control means and engine control element means include means operable to automatically control engine torque during upshifting to a higher gear.
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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) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |