GB8821027D0 - Engine/transmission control system - Google Patents

Engine/transmission control system

Info

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
Application number
GB8821027A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB8821027A priority Critical patent/GB8821027D0/en
Publication of GB8821027D0 publication Critical patent/GB8821027D0/en
Priority to GB8912190A priority patent/GB2221518A/en
Pending legal-status Critical Current

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  • 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>
GB8821027A 1988-09-07 1988-09-07 Engine/transmission control system Pending GB8821027D0 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
GB8912190D0 (en) 1989-07-12
GB2221518A (en) 1990-02-07

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