Patent EP0310447A1 successfully refreshed from Google Patents.
EP0310447A1
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Method of speed reduction ratio control in continuously variable speed transmission
Assignee: Honda Motor Co Ltd
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Filing: 1988-10-03
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Granted: —
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Expires: 2008-10-03
Abstract
Abstract A method of controlling the speed reduction ratio of a continuously variable speed transmission using change rate di/dt of speed reduction ratio as control value, wherein di/dt = -C₁*N/V²*(dV₀/dt)+C₂*1/V*(dN₀/dt) +C₃*N/V²*(dV₀/dt-dV/dt) or, dt/dt = -C₄*(N/V²)*dV₀/dt*K CL +C₅*(1/V)*dN₀/dt where C₁, C₂, C₃, C₄ and C₅ are constants, N is engine speed, V is vehicle speed, dV₀/dt is predicted acceleration calculated from reserved power of the engine, dV/dt is actual acceleration, dN₀/dt is a reference change rate of engine speed obtained based on a parameter representing a driver's intention to accelerate or decelerate, and K CL is a transmission rate of engine power through a clutch.
Inventors
- 👤 Yoshikazu Ishikawa
- 👤 Koji Sasajima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 10:38
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/42; F16H61/425; F16H61/46; F16H61/462; F16H59/00; F16H59/68; F16H59/70; F16H2059/702
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A method of controlling the speed reduction ratio of a continuously variable speed transmission, comprising the steps of: determining a predicted acceleration dV₀/dt calculated from reserved power of an engine, a reference change rate dN₀/dt of engine speed obtained based on a parameter representing a driver's intention to accelerate or decelerate, an actual vehicle speed V, an actual acceleration dV/dt, and an actual engine speed N, calculating a change rate di/dt of speed reduction ratio by the following equation using the above values di/dt = -C₁*N/V²*(dV₀/dt)+C₂*1/V*(dN₀/dt) +C₃*N/V²*(dV₀/dt-dV/dt) where, C₁, C₂ and C₃ are constants; and controlling the speed reduction ratio using said calculated change rate di/dt of speed reduction ratio as a control value.
Claim 2
Independent Claim
114 words
A method of controlling the speed reduction ratio of a continuously variable speed transmission, comprising the steps of: determining a predicted acceleration dV₀/dt calculated from reserved power of an engine, a reference change rate dN₀/dt of engine speed obtained based on a parameter representing a driver's intention to accelerate or decelerate, an actual vehicle speed V, an actual acceleration dV/dt, and an actual engine speed N, calculating a change rate di/dt of speed reduction ratio by the following equation using the above values di/dt = -C₁*N/V²*(dV₀/dt)+C₂*1/V*(dN₀/dt) +C₃*N/V²*(dV₀/dt-dV/dt) where, C₁, C₂ and C₃ are constants; and controlling the speed reduction ratio using said calculated change rate di/dt of speed reduction ratio as a control value.
Claim 3
Dependent Claim
65 words
A method of controlling a speed reduction ratio as defined in claim 1, wherein said continuously variable speed transmission comprises a hydraulic pump driven by said engine and a hydraulic motor driven by hydraulic pressure from said hydraulic pump; and displacement of at least one of said hydraulic pump and hydraulic motor is variably controlled based on said change rate di/dt of speed reduction ratio.
Claim 4
Independent Claim
121 words
A method of controlling the speed reduction ratio of a continuously variable speed transmission comprising the steps of: determining a predicted acceleration dV₀/dt calculated from reserved power of an engine, a reference change rate dN₀/dt of engine speed obtained based on a parameter representing a driver's intention to accelerate or decelerate, an actual vehicle speed V, an actual engine speed N and a transmission rate K CL of engine power through a clutch, calculating a change rate di/ dt of speed reduction ratio by the following equation using above values di/dt = -C₄*(N/V²)*dV₀/dt*K CL +C₅*(1/V)*dN₀/dt where, C₄ and C₅ are constants; and controlling the speed reduction ratio using said calculated change rate di/dt of speed reduction ratio as a control value.
Claim 5
Independent Claim
121 words
A method of controlling the speed reduction ratio of a continuously variable speed transmission comprising the steps of: determining a predicted acceleration dV₀/dt calculated from reserved power of an engine, a reference change rate dN₀/dt of engine speed obtained based on a parameter representing a driver's intention to accelerate or decelerate, an actual vehicle speed V, an actual engine speed N and a transmission rate K CL of engine power through a clutch, calculating a change rate di/ dt of speed reduction ratio by the following equation using above values di/dt = -C₄*(N/V²)*dV₀/dt*K CL +C₅*(1/V)*dN₀/dt where, C₄ and C₅ are constants; and controlling the speed reduction ratio using said calculated change rate di/dt of speed reduction ratio as a control value.
Claim 6
Dependent Claim
63 words
A method of controlling speed reduction as defined in claim 3, wherein said continuously variable speed transmission comprises a hydraulic pump driven by said engine and a hydraulic motor driven by hydraulic pressure from said hydraulic pump; and displacement of at least one of said hydraulic pump and hydraulic motor is variably controlled based on said change rate di/dt of speed reduction ratio.
References Cited (Backward Citations)
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