GB8821027D0 - Engine/transmission control system - Google Patents
Engine/transmission control systemInfo
- Publication number
- GB8821027D0 GB8821027D0 GB8821027A GB8821027A GB8821027D0 GB 8821027 D0 GB8821027 D0 GB 8821027D0 GB 8821027 A GB8821027 A GB 8821027A GB 8821027 A GB8821027 A GB 8821027A GB 8821027 D0 GB8821027 D0 GB 8821027D0
- Authority
- GB
- United Kingdom
- Prior art keywords
- cvt
- engine
- power demand
- generating
- engine speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Control Of Transmission Device (AREA)
- Control Of Fluid Gearings (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
Abstract
An engine/transmission control system for a skid-steered vehicle, comprises (a) an engine (2), (b) at least one continuously variable transmission (CVT) system (18, 28) connected to and for transmitting drive from the engine, (c) means (40) for sensing engine speed and for generating a first signal (VES) representative of engine speed (d) means (50) for sensing power demand placed on the engine and for generating a second signal (VPD) representative of power demand, (e) a CVT ratio controlling (38) for generating a third signal (VC), derived from the difference between the first and second signals, for controlling means for varying the transmission ratio of the CVT system (18, 28) between maximum and minimum values in such a manner that when CVT ratio is within a range between said values, the CVT ratio governs the torque reflected through the CVT system to the engine such that engine speed increases with increasing power demand but is controllably maintained within a narrow range of speeds at constant power demand, the CVT controlling means including a phase advance system and a phase retard system, which systems limit the rate of change of the CVT transmission rate to an extent dependent on the rate of change of engine speed, and (f) a steer system responsive to steer demand for generating differential speeds between left-hand side and right-hand side drive wheels (24, 34). The system is responsive to rapid change in power demand, and provides skid steering control under fluctuating power demand. The CVT system may be hydraulic, mechanical or electrical and the vehicle may have independent drive and steer CVT systems (Fig. 6). <IMAGE>
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8821027A GB8821027D0 (en) | 1988-09-07 | 1988-09-07 | Engine/transmission control system |
GB8912190A GB2221518A (en) | 1988-09-07 | 1989-05-26 | Engine transmission control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8821027A GB8821027D0 (en) | 1988-09-07 | 1988-09-07 | Engine/transmission control system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB8821027D0 true GB8821027D0 (en) | 1988-10-05 |
Family
ID=10643222
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8821027A Pending GB8821027D0 (en) | 1988-09-07 | 1988-09-07 | Engine/transmission control system |
GB8912190A Withdrawn GB2221518A (en) | 1988-09-07 | 1989-05-26 | Engine transmission control system |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8912190A Withdrawn GB2221518A (en) | 1988-09-07 | 1989-05-26 | Engine transmission control system |
Country Status (1)
Country | Link |
---|---|
GB (2) | GB8821027D0 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9126587D0 (en) * | 1991-12-14 | 1992-02-12 | Langley Gifford H | Vehicles |
US6138782A (en) * | 1999-02-25 | 2000-10-31 | Deere & Company | Steering responsive power boost |
GB2359287A (en) * | 2000-01-29 | 2001-08-22 | Prodrive Holdings Ltd | Vehicle transmission with a pair of wheels driven through respective variable-ratio drive means |
GB0018790D0 (en) | 2000-08-01 | 2000-09-20 | Prodrive 2000 Limited | Vehicle control |
ATE508032T1 (en) | 2004-02-06 | 2011-05-15 | Caterpillar Inc | WORK MACHINE WITH STEERING CONTROL |
SE529605C2 (en) | 2006-02-10 | 2007-10-02 | Bae Systems Haegglunds Ab | Differential gear for a multi-axle, wheel-borne motor vehicle, as well as drive transmission containing several such differential gears |
DE102006009064A1 (en) * | 2006-02-27 | 2007-08-30 | Liebherr-Werk Nenzing Gmbh, Nenzing | Method and device for controlling a drive system |
DE102010052065A1 (en) * | 2010-11-04 | 2012-05-10 | Robert Bosch Gmbh | Method for controlling the driving hydraulics of a working machine |
EP3707041A1 (en) | 2017-11-07 | 2020-09-16 | Hyster-Yale Group, Inc. | Continuously variable transmission control |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3886741A (en) * | 1973-05-03 | 1975-06-03 | Eaton Corp | Hydrostatic transmission anti-stall system |
US3914938A (en) * | 1974-08-20 | 1975-10-28 | Eaton Corp | Electrical hydrostatic transmission control system |
-
1988
- 1988-09-07 GB GB8821027A patent/GB8821027D0/en active Pending
-
1989
- 1989-05-26 GB GB8912190A patent/GB2221518A/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
GB8912190D0 (en) | 1989-07-12 |
GB2221518A (en) | 1990-02-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU7597194A (en) | Control system/method for automated mechanical transmission systems | |
US4444286A (en) | Torque-control with overspeed regulation and method of controlling a hydrostatic drive | |
US4457390A (en) | Power steering device | |
GB8912190D0 (en) | Engine/transmission control system | |
EP0333108A2 (en) | Steering system for motor vehicle | |
GB2322917B (en) | Shift control apparatus for continuously variable transmission | |
US5151860A (en) | Control method for electric power steering apparatus for vehicle | |
JPS63306968A (en) | Control device for motor-operated type power steering system | |
EP0840468A3 (en) | Optical frequency control system | |
KR920009629A (en) | Front and rear wheel differential four wheel drive | |
EP0779199A3 (en) | A steering control apparatus utilizing a hysteresis control of a steering torque | |
EP0559342A3 (en) | A method and an apparatus for controlling a car equipped with an automatic transmission having a lockup clutch | |
ES8503592A1 (en) | Electrical power assisted steering mechanism. | |
WO1993011959A3 (en) | Traction control system responsive to wheel speed fluctuations | |
EP0319830A1 (en) | Device for controlling driving force distribution in four-wheel drive vehicle | |
EP0355975A3 (en) | Multiple feedback loop control method and system for controlling wheel slip | |
JPS644577A (en) | Car controller having wheel-speed difference input | |
EP0318688B1 (en) | Limited-slip differential control system | |
US5809443A (en) | Four-wheel drive transfer case controller with compensation for tires with different diameters | |
JPS5799468A (en) | Power steering device | |
AU586711B2 (en) | Torque splitting system for vehicles | |
KR960706115A (en) | CIRCUITRY FOR EVALUATING THE SIGNALS OF A YAW RATE SENSOR | |
ATE88145T1 (en) | ARRANGEMENT FOR CONTROLLING AN ELECTRICALLY CONTROLLED BRAKE CIRCUIT OF A MULTI-CIRCUIT BRAKE SYSTEM WITH PRESSURE MEDIUM-ACTIVATED BRAKES DISPOSED IN A VEHICLE. | |
EP0388895A3 (en) | Variable transmission power type transmitter | |
US5012884A (en) | Antilock braking method and apparatus for a four-wheel drive vehicle |