WO2001038121A1 - Engine speed control for improved shifting - Google Patents

Engine speed control for improved shifting Download PDF

Info

Publication number
WO2001038121A1
WO2001038121A1 PCT/EP2000/011773 EP0011773W WO0138121A1 WO 2001038121 A1 WO2001038121 A1 WO 2001038121A1 EP 0011773 W EP0011773 W EP 0011773W WO 0138121 A1 WO0138121 A1 WO 0138121A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnitude
speed command
command signal
shift
during
Prior art date
Application number
PCT/EP2000/011773
Other languages
French (fr)
Inventor
Duane Frederick Meyer
Original Assignee
Deere & Company
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 Deere & Company filed Critical Deere & Company
Priority to UA2002064758A priority Critical patent/UA66950C2/en
Priority to DE60032511T priority patent/DE60032511T2/en
Priority to EP00990616A priority patent/EP1237747B1/en
Priority to EA200200615A priority patent/EA003849B1/en
Publication of WO2001038121A1 publication Critical patent/WO2001038121A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B60W10/11—Stepped gearings
    • B60W10/113—Stepped gearings with two input flow paths, e.g. double clutch transmission selection of one of the torque flow paths by the corresponding input clutch
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/19—Improvement of gear change, e.g. by synchronisation or smoothing gear shift
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2540/00—Input parameters relating to occupants
    • B60W2540/16—Ratio selector position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/06—Combustion engines, Gas turbines
    • B60W2710/0644—Engine speed
    • B60W2710/0661—Speed change rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/68—Inputs being a function of gearing status
    • F16H2059/6807—Status of gear-change operation, e.g. clutch fully engaged
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H2306/00—Shifting
    • F16H2306/40—Shifting activities
    • F16H2306/42—Changing the input torque to the transmission
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H2306/00—Shifting
    • F16H2306/40—Shifting activities
    • F16H2306/44—Removing torque from current gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H2306/00—Shifting
    • F16H2306/40—Shifting activities
    • F16H2306/52—Applying torque to new gears
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/68—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings
    • F16H61/684—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive
    • F16H61/688—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for stepped gearings without interruption of drive with two inputs, e.g. selection of one of two torque-flow paths by clutches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F16H63/50—Signals to an engine or motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
    • F16H63/50—Signals to an engine or motor
    • F16H63/502—Signals to an engine or motor for smoothing gear shifts

Definitions

  • the present invention relates to method and to a control system for a vehicle having a governor controlled engine which drives a power shift transmission, the power shift transmission having a gear box which is operated by a set of pressure operated clutches which are controlled by a corresponding set of solenoid operated shift control valves which are controlled by an electronic vehicle control unit (VCU) in response to the shift command signals generated by an operator controlled shift control lever mechanism, the engine being controlled by an electronic engine control unit (ECU) which receives a speed command signal from the VCU.
  • VCU electronic vehicle control unit
  • ECU electronic engine control unit
  • Powershift transmissions change speeds by disengaging one or more clutches and then engaging one or more clutches, with no interruption of power during the shift.
  • Shift smoothness is obtained by modulating the pressure of the oncoming clutches, i.e. engaging them at low pressure. Shift smoothness is very sensitive to having the optimum engagement pressure in relation to the load being transmitted by the transmission. If the engagement pressure is too low, the vehicle may drop load or speed during the shift, if the engagement pressure is too high, the shift will be aggressive, jumpy and harsh. Under lightly loaded conditions, the typical engine governor response contributes to the poor shift. For example, during an upshift, if the engaging clutch locks up quickly, it will bring the engine speed down rapidly.
  • an object of this invention is to provide a transmission and engine control system and a related method which prevents such engine governor- caused rough shifts and improves the shift quality.
  • Another object of this invention is to provide a transmission and engine control system and a related method which makes shift smoothness less sensitive to modulating the oncoming clutch at the optimum pressure.
  • a method and a control system for a vehicle includes an engine which drives a powershift transmission.
  • the powershift transmission has a gear box which is operated by a set of pressure operated clutches which are controlled by a corresponding set of solenoid operated shift control valves.
  • the valves are controlled by an electronic vehicle control unit (VCU) in response to the shift command signals generated by an operator controlled shift control lever mechanism.
  • the engine is controlled by an electronic engine control unit (ECU) which receives a speed command signal from the VCU.
  • ECU electronic engine control unit
  • the control system depressurizes at least one off-going clutch and later pressurizes at least one on- going clutch.
  • the VCU during a shift, abruptly modifies the magnitude of the speed command signal while the off-going clutch is being de-pressurized, and then gradually returns the magnitude of the speed command signal back to its original magnitude when the on-going clutch is fully pressurized.
  • the speed command signal SC is similarly momentarily decreased at the start of the clutch swap, and is then gradually increased or ramped up.
  • the speed command signal SC is similarly momentarily increased at the start of the clutch swap, and is then gradually decreased or ramped down.
  • Fig. 1 is a simplified schematic diagram of a vehicle transmission/engine drive and control system of the present invention
  • Fig. 2 is a signal timing diagram illustrating the time behavior of the speed command signal in relation to the operation of the transmission control clutches.
  • a vehicle power train includes an engine 10 which drives a power shift transmission 12, which has an output shaft 13 which is connected to drive wheels (not shown).
  • the power shift transmission 12 includes a transmission or gear box 18 which is operated by a set of pressure operated control elements or clutches 20 which are controlled by a corresponding set of solenoid operated shift control valves 22.
  • the transmission 18 is preferably a powershift transmission such as a production John Deere 16 speed powershift transmission, which is controlled by an electronic vehicle control unit (VCU) 14, or such as described in US-A-5,011 ,465.
  • the engine 10 is preferably an electronically controlled engine such as a production John Deere 8.1 liter governor controlled Diesel engine, and is controlled by a production electronic engine control unit (ECU) 16 in response to an engine speed or throttle command signal.
  • ECU production electronic engine control unit
  • the VCU 14 sends shift control signals to the shift control valves 22 in response to command signals it receives from an operator controlled shift control lever mechanism 24, such as the shift control mechanism of a production John Deere 8000 Series tractor.
  • Fig. 2 shows the behavior of the pressure (P-OFF) of an off-going clutch and P-ON of an on-going clutch during a typical upshift.
  • the VCU 14 controls or modifies the speed command or throttle command signal during upshifts and downshifts to improve the quality or smoothness of shifts.
  • the VCU 14 momentarily reduces the magnitude of the speed command signal during an upshift of the power shift transmission 12. More specifically, during an upshift, the magnitude of the speed command signal, SC, is abruptly reduced when the pressure of the off-going clutch, P-OFF, is being reduced to zero.
  • the speed command signal SC is reduced to a value which would produce a lower engine speed corresponding to the change in gear ratio resulting from the upshift.
  • the magnitude of the speed command signal SC is gradually increased as the pressure P-ON of the oncoming clutch is gradually increased, and so that the magnitude of the speed command signal SC is back up to its original magnitude when the on-going clutch pressure P-ON is at its full on pressure level.
  • the speed command signal is modified in coordination with the changes to the transmission control clutch pressure.
  • the speed command signal SC momentarily increased at the start of the clutch swap, and is then gradually decreased or ramped down.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Transmission Device (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Control Of Fluid Gearings (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

A vehicle includes a powershift transmission (12) driven by an electronically controlled engine (10). A control system momentarily modifies a magnitude of an engine speed command signal SC during a shift of the power shift transmission (12) in order to make the shift smoother and less sensitive to achieving optimum clutch engagement pressure. It also prevents an engine governor from over-reacting and causing rough shifts.

Description

ENGINE SPEED CONTROL FOR IMPROVED SHIFTING
The present invention relates to method and to a control system for a vehicle having a governor controlled engine which drives a power shift transmission, the power shift transmission having a gear box which is operated by a set of pressure operated clutches which are controlled by a corresponding set of solenoid operated shift control valves which are controlled by an electronic vehicle control unit (VCU) in response to the shift command signals generated by an operator controlled shift control lever mechanism, the engine being controlled by an electronic engine control unit (ECU) which receives a speed command signal from the VCU.
Powershift transmissions change speeds by disengaging one or more clutches and then engaging one or more clutches, with no interruption of power during the shift. Shift smoothness is obtained by modulating the pressure of the oncoming clutches, i.e. engaging them at low pressure. Shift smoothness is very sensitive to having the optimum engagement pressure in relation to the load being transmitted by the transmission. If the engagement pressure is too low, the vehicle may drop load or speed during the shift, if the engagement pressure is too high, the shift will be aggressive, jumpy and harsh. Under lightly loaded conditions, the typical engine governor response contributes to the poor shift. For example, during an upshift, if the engaging clutch locks up quickly, it will bring the engine speed down rapidly. The engine governor typically over-reacts to this drop in speed by quickly increasing fuel to the engine. An excess amount of fuel may then cause the engine to quickly overshoot the commanded speed. The resulting acceleration-deceleration causes the vehicle to pitch fore and aft, and produces a "jumpy" feel. Accordingly, an object of this invention is to provide a transmission and engine control system and a related method which prevents such engine governor- caused rough shifts and improves the shift quality.
Accordingly, another object of this invention is to provide a transmission and engine control system and a related method which makes shift smoothness less sensitive to modulating the oncoming clutch at the optimum pressure.
These and other objects are achieved by the present invention according one of the claims 1 or 12. Further advantageous arrangements and developments of the invention appear from the dependent claims.
In an advantageous embodiment of the present invention a method and a control system for a vehicle is provided. The vehicle includes an engine which drives a powershift transmission. The powershift transmission has a gear box which is operated by a set of pressure operated clutches which are controlled by a corresponding set of solenoid operated shift control valves. The valves are controlled by an electronic vehicle control unit (VCU) in response to the shift command signals generated by an operator controlled shift control lever mechanism. The engine is controlled by an electronic engine control unit (ECU) which receives a speed command signal from the VCU. During an upshift the control system depressurizes at least one off-going clutch and later pressurizes at least one on- going clutch. The VCU, during a shift, abruptly modifies the magnitude of the speed command signal while the off-going clutch is being de-pressurized, and then gradually returns the magnitude of the speed command signal back to its original magnitude when the on-going clutch is fully pressurized. During an upshift, the speed command signal SC is similarly momentarily decreased at the start of the clutch swap, and is then gradually increased or ramped up. During a downshift, the speed command signal SC is similarly momentarily increased at the start of the clutch swap, and is then gradually decreased or ramped down. This strategy allows the engine to accomplish most of the change in vehicle speed, and is less dependent on proper slipping of the oncoming clutch. This also causes the engine governor to react properly to the shift, and avoids governor over-reaction.
The invention and further advantageous developments and arrangements of the invention will now be described and explained in more detail by way of example and with reference to the accompanying drawings in which:
Fig. 1 is a simplified schematic diagram of a vehicle transmission/engine drive and control system of the present invention; and Fig. 2 is a signal timing diagram illustrating the time behavior of the speed command signal in relation to the operation of the transmission control clutches.
As shown in FIG. 1 , a vehicle power train includes an engine 10 which drives a power shift transmission 12, which has an output shaft 13 which is connected to drive wheels (not shown). The power shift transmission 12 includes a transmission or gear box 18 which is operated by a set of pressure operated control elements or clutches 20 which are controlled by a corresponding set of solenoid operated shift control valves 22. The transmission 18 is preferably a powershift transmission such as a production John Deere 16 speed powershift transmission, which is controlled by an electronic vehicle control unit (VCU) 14, or such as described in US-A-5,011 ,465. The engine 10 is preferably an electronically controlled engine such as a production John Deere 8.1 liter governor controlled Diesel engine, and is controlled by a production electronic engine control unit (ECU) 16 in response to an engine speed or throttle command signal.
The VCU 14 sends shift control signals to the shift control valves 22 in response to command signals it receives from an operator controlled shift control lever mechanism 24, such as the shift control mechanism of a production John Deere 8000 Series tractor. For example, Fig. 2 shows the behavior of the pressure (P-OFF) of an off-going clutch and P-ON of an on-going clutch during a typical upshift.
According to the present invention, the VCU 14 controls or modifies the speed command or throttle command signal during upshifts and downshifts to improve the quality or smoothness of shifts. As best seen in Fig. 2, the VCU 14 momentarily reduces the magnitude of the speed command signal during an upshift of the power shift transmission 12. More specifically, during an upshift, the magnitude of the speed command signal, SC, is abruptly reduced when the pressure of the off-going clutch, P-OFF, is being reduced to zero. Preferably, the speed command signal SC is reduced to a value which would produce a lower engine speed corresponding to the change in gear ratio resulting from the upshift. Thereafter, the magnitude of the speed command signal SC is gradually increased as the pressure P-ON of the oncoming clutch is gradually increased, and so that the magnitude of the speed command signal SC is back up to its original magnitude when the on-going clutch pressure P-ON is at its full on pressure level. Thus, as described above, and as shown in Fig. 2, the speed command signal is modified in coordination with the changes to the transmission control clutch pressure.
Similarly, although not illustrated, for a downshift, the speed command signal SC momentarily increased at the start of the clutch swap, and is then gradually decreased or ramped down.
While the present invention has been described in conjunction with a specific embodiment, it is understood that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, this invention is intended to embrace all such alternatives, modifications and variations which fall within the spirit and scope of the appended claims.

Claims

Claims
1. Method for a vehicle having a governor controlled engine (10) which drives a power shift transmission (12), the power shift transmission (12) having a gear box (18) which is operated by a set of pressure operated clutches (20) which are controlled by a corresponding set of solenoid operated shift control valves (22) which are controlled by an electronic vehicle control unit (VCU) in response to the shift command signals generated by an operator controlled shift control lever mechanism (24), the engine (10) being controlled by an electronic engine control unit (ECU) which receives a speed command signal (SC) from the VCU, the method of improving shift quality comprising: momentarily modifying a magnitude of the speed command signal (SC) during a shift of the power shift transmission (12); and during said shift, abruptly modifying the magnitude of the speed command signal (SC) from a first magnitude to a second magnitude then gradually returning the speed command signal (SC) back to said first magnitude upon completion of said shift.
2. The method of claim 1 , wherein: the solenoid operated shift control valves (22) operate to vary pressures applied to the pressure operated clutches (20); and the magnitude of the speed command signal (SC) is momentarily modified in coordination with the variations of said clutch pressure.
3. The method according claim 1 or 2, wherein: during an upshift of the power shift transmission (12) the magnitude of the speed command signal (SC) is reduced.
The method of claim 3, wherein: the magnitude of the speed command signal (SC) is momentarily reduced during said upshift.
5. The method of claim 3 or 4, wherein: during said upshift, the magnitude of the speed command signal (SC) is abruptly reduced and then gradually increased back to the first magnitude prior to said upshift.
6. The method according one of the claims 1 to 5, wherein: during a downshift of the power shift transmission (12), the magnitude of the speed command signal (SC) is increased.
7. The method of claim 6, wherein: the magnitude of the speed command signal (SC) is momentarily increased during said downshift.
8. The method of claim 6 or 7, wherein: during said downshift, the magnitude of the speed command signal (SC) is abruptly increased and then gradually decreased back to the first magnitude prior to said downshift.
9. The method according one of the claims 1 to 8, wherein: the speed command signal (SC) is modified to a value which produces a modified engine speed corresponding to a change in a gear ratio resulting from the shift.
10. The method of claim 9, wherein: during an upshift, the speed command signal (SC) is reduced to a value which produces a lower engine speed corresponding to a change in a gear ratio resulting from the upshift.
11. The method of claim 9 or 10, wherein: during a downshift, the speed command signal (SC) is increased to a value which produces a higher engine speed corresponding to a change in a gear ratio resulting from the downshift.
12. A control system for a vehicle having a governor controlled engine (10) which drives a power shift transmission (12), the power shift transmission (12) having a gear box which is operated by a set of pressure operated clutches (20) which are controlled by a corresponding set of solenoid operated shift control valves (22) which are controlled by an electronic vehicle control unit (VCU) in response to the shift command signals generated by an operator controlled shift control lever mechanism (24), the engine (10) being controlled by an electronic engine control unit (ECU) which receives a speed command signal (SC) from the VCU, comprising: a speed command modifier for momentarily modifying a magnitude of the speed command signal (SC) during a shift of the power shift transmission (12), and during said shift, the speed command modifier abruptly modifies the magnitude of the speed command signal (SC) from a first magnitude to a second magnitude, and then gradually returns the magnitude of the speed command signal (SC) back to the first magnitude upon completion of said shift.
13. The control system of claim 12, wherein: the solenoid operated shift control valves (22) operate to vary pressures applied to the pressure operated clutches (20); and the magnitude of the speed command signal (SC) is momentarily modified in coordination with the variations of said clutch pressure.
14. The control system according claim 12 or 13, wherein: the speed command modifier comprises means for modifying the magnitude of the speed command signal (SC) according the method of one of the claims 3 to 11.
PCT/EP2000/011773 1999-11-29 2000-11-25 Engine speed control for improved shifting WO2001038121A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
UA2002064758A UA66950C2 (en) 1999-11-29 2000-11-25 Method and system for control of engine speed for improvement of speed change
DE60032511T DE60032511T2 (en) 1999-11-29 2000-11-25 SPEED CONTROL OF AN INTERNAL COMBUSTION ENGINE FOR IMPROVED SWITCHING PROPERTIES
EP00990616A EP1237747B1 (en) 1999-11-29 2000-11-25 Engine speed control for improved shifting
EA200200615A EA003849B1 (en) 1999-11-29 2000-11-25 Method and engine speed control system for improved shifting

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/451,182 US6254509B1 (en) 1999-11-29 1999-11-29 Engine throttle control for improved shifting
US09/451,182 1999-11-29

Publications (1)

Publication Number Publication Date
WO2001038121A1 true WO2001038121A1 (en) 2001-05-31

Family

ID=23791138

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/011773 WO2001038121A1 (en) 1999-11-29 2000-11-25 Engine speed control for improved shifting

Country Status (11)

Country Link
US (1) US6254509B1 (en)
EP (1) EP1237747B1 (en)
JP (1) JP2001180336A (en)
AR (1) AR035386A1 (en)
BR (1) BR0005664A (en)
CA (1) CA2302786A1 (en)
DE (1) DE60032511T2 (en)
EA (1) EA003849B1 (en)
ES (1) ES2276715T3 (en)
UA (1) UA66950C2 (en)
WO (1) WO2001038121A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1741961A3 (en) * 2005-07-06 2010-05-19 Deere & Company Transmission shift control method
EP2458249A1 (en) * 2010-11-25 2012-05-30 Hoerbiger Drivetrain Mechatronics B.V.B.A. Method of controlling a double clutch in a vehicle transmission, and clutch control system for controlling a double clutch

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6478713B1 (en) * 2000-10-23 2002-11-12 General Motors Corporation Engine limit control for closed-throttle transmission shifting
US6843755B2 (en) 2002-03-27 2005-01-18 Caterpillar Inc Power management system
FR2864479B1 (en) * 2003-12-24 2006-03-03 Renault Sas DEVICE FOR CONTROLLING AN AUTOMATED GEARBOX FOR IMPROVING THE QUALITY OF LOW-MOVEMENT SPEEDS WITH LOW MOTOR TORQUE
DE102004001381A1 (en) * 2004-01-09 2005-08-04 Zf Friedrichshafen Ag Method for increasing the spontaneity of overlap circuits in an automatic transmission
JP4461997B2 (en) * 2004-10-12 2010-05-12 日産自動車株式会社 Engine control device
JP4654173B2 (en) * 2006-11-16 2011-03-16 日立オートモティブシステムズ株式会社 Vehicle control device
JP4625824B2 (en) * 2007-04-25 2011-02-02 ボッシュ株式会社 Internal combustion engine output control method and apparatus
US20090048053A1 (en) * 2007-08-16 2009-02-19 Ruppert Rex Leroy Auxiliary transmission for a continously variable transmission with active speed control
CN101973270B (en) * 2010-08-09 2013-03-27 海博瑞德（北京）汽车技术有限公司 Auto manual transmission (AMT) of automobile and control method thereof
KR20210047035A (en) * 2019-10-21 2021-04-29 현대자동차주식회사 Vehicle supercharging system and control method thereof
US11613246B2 (en) 2021-01-21 2023-03-28 Deere & Company Power control system with engine throttle shift function
US11628822B2 (en) 2021-02-09 2023-04-18 Deere & Company Power control system with stall prevention clutch modulation function
US11299141B1 (en) 2021-02-10 2022-04-12 Deere & Company System for multi-layer braking and retardation in a work vehicle
US11820361B2 (en) 2021-11-30 2023-11-21 Deere & Company Transmission assembly with electrical machine unit for improved shift quality
US11607948B1 (en) 2021-12-22 2023-03-21 Deere & Company Electronically-variable power shift transmission for work vehicles
US11585412B1 (en) 2021-12-22 2023-02-21 Deere & Company Electronically-variable, dual-path power shift transmission for work vehicles
US11913528B1 (en) 2022-10-28 2024-02-27 Deere & Company Multi-mode continuously variable transmission assembly with drop set arrangement

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691285A (en) * 1983-12-21 1987-09-01 Nissan Motor Co., Ltd. Method and apparatus for alleviating transmission shift shocks
US5011465A (en) 1990-04-20 1991-04-30 Deere & Company Wide speed-range multi-speed power shift transmission
US5212998A (en) * 1991-12-02 1993-05-25 Deere & Company Transmission control system with load compensated shift modulation
US5445576A (en) * 1993-06-16 1995-08-29 Saturn Corporation Engine torque management during coast downshifting of an automatic shift transmission
US5562567A (en) * 1995-06-30 1996-10-08 General Motors Corporation Shift torque management
DE19804630A1 (en) * 1997-02-06 1998-08-20 Jatco Corp Vehicle automatic transmission control e.g. for turbine
US5820517A (en) * 1996-04-30 1998-10-13 Honda Giken Kogyo Kabushiki Kaisha Control system for internal combustion engines for automotive vehicles
US5827151A (en) * 1996-04-26 1998-10-27 Honda Giken Kogyo Kabushiki Kaisha Control system for internal combustion engines for vehicles
US5842375A (en) * 1997-02-18 1998-12-01 Deere & Company Calibration method for transmission control clutches

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656024A (en) 1949-11-08 1953-10-20 Leo F Sobie Automatic throttle control
US2923387A (en) 1954-07-30 1960-02-02 Humber Ltd Clutch and throttle control mechanisms
US4646891A (en) 1985-01-31 1987-03-03 Eaton Corporation Automatic clutch control
US4724723A (en) * 1986-07-30 1988-02-16 General Motors Corporation Closed loop shift quality control system
US5091854A (en) * 1988-05-26 1992-02-25 Mazda Motor Corporation Control systems for vehicle engines coupled with automatic transmissions
DE3924077A1 (en) 1989-07-20 1991-01-24 Bosch Gmbh Robert METHOD FOR CONTROLLING THE FUEL AMOUNT OF INTERNAL COMBUSTION ENGINES
JPH03121222A (en) * 1989-10-03 1991-05-23 Nissan Motor Co Ltd Driving controller of vehicle
US5184301A (en) 1990-11-27 1993-02-02 Navistar International Transportation Corp. Automotive vehicle microprocessor control having clutch priority engine speed control
KR960000634B1 (en) * 1991-06-26 1996-01-10 마쯔다 가부시기가이샤 Engine controller
JP3445291B2 (en) * 1992-10-13 2003-09-08 株式会社日立製作所 Drive torque control device
US5314050A (en) 1992-12-09 1994-05-24 Eaton Corporation Clutch mode control logic
US5316116A (en) 1992-12-09 1994-05-31 Eaton Corporation Engine control method for use with automatic clutch control
JP3017900B2 (en) * 1993-03-15 2000-03-13 アイシン・エィ・ダブリュ株式会社 Shift control device for automatic transmission for vehicle
US5374224A (en) 1993-12-23 1994-12-20 Ford Motor Company System and method for controlling the transient torque output of a variable displacement internal combustion engine
GB9421324D0 (en) 1994-10-22 1994-12-07 Automotive Products Plc Clutch control system
US5662553A (en) 1995-08-07 1997-09-02 Reichlinger; Gary Electromagnetic clutch and engine control
JP3599899B2 (en) * 1996-04-26 2004-12-08 本田技研工業株式会社 Output torque control device for internal combustion engine for vehicle
JP3630199B2 (en) 1996-04-30 2005-03-16 本田技研工業株式会社 Output torque control device for internal combustion engine for vehicle
JP3630198B2 (en) * 1996-04-30 2005-03-16 本田技研工業株式会社 Internal combustion engine control device for vehicle
JP3204140B2 (en) * 1996-07-24 2001-09-04 トヨタ自動車株式会社 Vehicle output control device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691285A (en) * 1983-12-21 1987-09-01 Nissan Motor Co., Ltd. Method and apparatus for alleviating transmission shift shocks
US5011465A (en) 1990-04-20 1991-04-30 Deere & Company Wide speed-range multi-speed power shift transmission
US5212998A (en) * 1991-12-02 1993-05-25 Deere & Company Transmission control system with load compensated shift modulation
US5445576A (en) * 1993-06-16 1995-08-29 Saturn Corporation Engine torque management during coast downshifting of an automatic shift transmission
US5562567A (en) * 1995-06-30 1996-10-08 General Motors Corporation Shift torque management
US5827151A (en) * 1996-04-26 1998-10-27 Honda Giken Kogyo Kabushiki Kaisha Control system for internal combustion engines for vehicles
US5820517A (en) * 1996-04-30 1998-10-13 Honda Giken Kogyo Kabushiki Kaisha Control system for internal combustion engines for automotive vehicles
DE19804630A1 (en) * 1997-02-06 1998-08-20 Jatco Corp Vehicle automatic transmission control e.g. for turbine
US5842375A (en) * 1997-02-18 1998-12-01 Deere & Company Calibration method for transmission control clutches

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1741961A3 (en) * 2005-07-06 2010-05-19 Deere & Company Transmission shift control method
EP2458249A1 (en) * 2010-11-25 2012-05-30 Hoerbiger Drivetrain Mechatronics B.V.B.A. Method of controlling a double clutch in a vehicle transmission, and clutch control system for controlling a double clutch
WO2012069165A1 (en) * 2010-11-25 2012-05-31 Hoerbiger Drivetrain Mechatronics B.V.B.A. Method of controlling a double clutch in a vehicle transmission, and clutch control system for controlling a double clutch
US9103388B2 (en) 2010-11-25 2015-08-11 Transmisiones Y Equipos Mecanicos S.A. De C.V. Method of controlling a double clutch in a vehicle transmission, and clutch control system for controlling a double clutch
US9683660B2 (en) 2010-11-25 2017-06-20 Transmisiones Y Equipos Mecanicos, S.A. De C.V. Method of controlling a double clutch in a vehicle transmission, and clutch control system for controlling a double clutch

Also Published As

Publication number Publication date
ES2276715T3 (en) 2007-07-01
UA66950C2 (en) 2004-06-15
DE60032511D1 (en) 2007-02-01
CA2302786A1 (en) 2001-05-29
JP2001180336A (en) 2001-07-03
EP1237747A1 (en) 2002-09-11
US6254509B1 (en) 2001-07-03
EA003849B1 (en) 2003-10-30
EA200200615A1 (en) 2002-12-26
DE60032511T2 (en) 2007-11-22
EP1237747B1 (en) 2006-12-20
BR0005664A (en) 2001-07-31
AR035386A1 (en) 2004-05-26

Similar Documents

Publication Publication Date Title
EP1237747B1 (en) Engine speed control for improved shifting
EP1460317A2 (en) Automatic shift control apparatus and method for manual transmission
US20070026996A1 (en) Shift control apparartus and shift control method of automatic transmission of vehicle
US20030100985A1 (en) Method of controlling a vehicle and system of controlling the same
US6454678B1 (en) Shift control method for automatic transmission
CA1313778C (en) Method of determining engine racing and method of preventing engine racing during shift in vehicular automatic transmission
GB2326682A (en) Drive train control varies engine torque during gear shift
EP1118802B1 (en) Transmission control systems
JP2002106704A (en) Controlling method for automobile transmission
CN101797919B (en) Control device for vehicle drive device and control method for vehicle drive device
US5462501A (en) Method of actuating an automatic transmission
US6478713B1 (en) Engine limit control for closed-throttle transmission shifting
US5092199A (en) Hydraulic control apparatus for automatic transmissions
US20040014563A1 (en) Transmission shift control with engine torque control
US6464617B1 (en) Shift control method for automatic transmission
EP1040956B1 (en) Integrated control system for engine and automatic transmission
JP4286323B2 (en) Method for improving the naturalness of shifting in an automatic transmission
US6843755B2 (en) Power management system
US20020037789A1 (en) Method for controlling a damper clutch of an automatic transmission
US6510371B1 (en) Shift control method for automatic transmission
US6714850B2 (en) Method of controlling shift action in up-shift mode operation of automatic transmission for vehicles
JPS6034562A (en) Gear shifting control method for automatic transmission
CN111566390B (en) Control device and control method for continuously variable transmission
US6511401B2 (en) Shift control method for automatic transmission
US5366425A (en) Control system for selecting a retarder mode shifting pattern for a self-propelled motor vehicle

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): UA

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
WWE Wipo information: entry into national phase

Ref document number: 2000990616

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 200200615

Country of ref document: EA

WWP Wipo information: published in national office

Ref document number: 2000990616

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 2000990616

Country of ref document: EP