WO1997004982B1 - Engine speed synchronization system for assisting in manual transmission shifting - Google Patents

Engine speed synchronization system for assisting in manual transmission shifting

Info

Publication number
WO1997004982B1
WO1997004982B1 PCT/US1996/012272 US9612272W WO9704982B1 WO 1997004982 B1 WO1997004982 B1 WO 1997004982B1 US 9612272 W US9612272 W US 9612272W WO 9704982 B1 WO9704982 B1 WO 9704982B1
Authority
WO
WIPO (PCT)
Prior art keywords
speed
gear
engine
shift
output shaft
Prior art date
Application number
PCT/US1996/012272
Other languages
French (fr)
Other versions
WO1997004982A1 (en
Filing date
Publication date
Priority claimed from US08/508,135 external-priority patent/US5569115A/en
Application filed filed Critical
Priority to BR9609848A priority Critical patent/BR9609848A/en
Priority to AU66380/96A priority patent/AU712514B2/en
Priority to DE69617432T priority patent/DE69617432T2/en
Priority to EP96926132A priority patent/EP0837787B1/en
Publication of WO1997004982A1 publication Critical patent/WO1997004982A1/en
Publication of WO1997004982B1 publication Critical patent/WO1997004982B1/en

Links

Abstract

An improved system for synchronizing the output speed of an engine (22) with that necessary at the next expected gear to achieve a desired speed ratio updates and monitors the currently engaged gear. In this way, the system improves upon prior systems that attempted to 'count' to determine the currently engaged gear. Moreover, the system provides an operator with a shift intent switch (32) that allows the operator to predict an upshift or a downshift as the next shift. The system calculates what the next expected gear will be based upon this indication. Once the next expected gear is known, the speed ratio at that gear is determined. Once the transmission is moved to neutral, the synchronization speed for the engine (22) is then determined by multiplying the current transmission output speed with that next speed ratio. The engine control (28) drives the engine speed to achieve synchronization speed ratio. The determination is updated as the transmission speed changes. The operator completes the shift with a manual stick shift.

Claims

AMENDED CLAIMS
[received by the International Bureau on 4 February 1997 (04.02.97); original claim 8 amended; remaining claims unchanged (1 page)]
8. A method of controlling the operation of a vehicle, comprising the steps of:
(a) providing an engine having an output shaft, an electronic control unit for controlling the speed of said engine output shaft, said engine output shaft being connected to drive a multi-speed transmission, and said electronic control unit being operable to calculate the ratio of the transmission and engine output shaft speeds, and determine which gear is currently engaged;
(b) operating a vehicle using the system provided in step (a);
(c) determining a currently engaged gear by calculating the ratio of the engine and transmission output shaft speeds, and comparing said calculated ratio to expected ratios;
(d) determining whether an upshift or a downshift is to be expected as the next shift;
(e) determining a desired engine synchronization speed at a next expected gear by determining said next expected gear based upon said currently engaged gear and said expected shift of step (d), and identifying an engine synchronization speed by multiplying the speed ratio at said next expected gear with the current transmission output speed;
(f) beginning to control said output speed of said engine output shaft to approach said synchronization speed; and
(g) manually shifting said multi-speed transmission toward said next expected gear.
9. A method as recited in Claim 8, wherein the determination of step (d) includes providing an operator shift intention switch, and moving said switch between a position
indicating an upshift or a downshift as appropriate.
PCT/US1996/012272 1995-07-27 1996-07-25 Engine speed synchronization system for assisting in manual transmission shifting WO1997004982A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BR9609848A BR9609848A (en) 1995-07-27 1996-07-25 Engine speed synchronization system to assist in changing manual transmission
AU66380/96A AU712514B2 (en) 1995-07-27 1996-07-25 Engine speed synchronization system for assisting in manual transmission shifting
DE69617432T DE69617432T2 (en) 1995-07-27 1996-07-25 ENGINE SPEED SYNCHRONIZATION SYSTEM FOR MANUAL GEARBOX
EP96926132A EP0837787B1 (en) 1995-07-27 1996-07-25 Engine speed synchronization system for assisting in manual transmission shifting

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/508,135 US5569115A (en) 1995-07-27 1995-07-27 Engine speed synchronization system for assisting in manual transmission shifting
US08/508,135 1995-07-27

Publications (2)

Publication Number Publication Date
WO1997004982A1 WO1997004982A1 (en) 1997-02-13
WO1997004982B1 true WO1997004982B1 (en) 1997-03-13

Family

ID=24021539

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1996/012272 WO1997004982A1 (en) 1995-07-27 1996-07-25 Engine speed synchronization system for assisting in manual transmission shifting

Country Status (6)

Country Link
US (1) US5569115A (en)
EP (1) EP0837787B1 (en)
AU (1) AU712514B2 (en)
BR (1) BR9609848A (en)
DE (1) DE69617432T2 (en)
WO (1) WO1997004982A1 (en)

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