Hybrid drive system wherein clutch is engaged when engine speed has exceeded motor speed upon switching from motor drive mode to engine drive mode
First Claim
1. A hybrid drive system for an automotive vehicle comprising:
- (a) a vehicle drive power source including an engine operable by combustion of a fuel to generate a drive force, and an electric motor;
(b) a transmission;
(c) a clutch of a frictional coupling type disposed between said engine and said transmission;
(d) clutch-slip control means operable upon switching of a vehicle drive mode from a motor drive mode in which the automotive vehicle is driven by operation of said electric motor only, to an engine drive mode in which the automotive vehicle is driven by operation of said engine, said clutch-slip control means effecting a slipping engagement of said clutch; and
(e) transition-input-torque estimating means for estimating an input torque of said transmission on the basis of an engaging torque of said clutch during said slipping engagement of said clutch while the vehicle drive mode is switched from said motor drive mode to said engine drive mode.
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Accused Products
Abstract
A hybrid vehicle drive system including (a) an engine, (b) an electric motor, (c) a planetary gear device having a first rotary element connected to the engine, a second rotary element connected to the electric motor and connected through a first clutch to an output member connected to vehicle drive wheel, and a third rotary element connected through a second clutch to the output member, (d) a forward-motor-drive control device for engaging the first clutch and releasing the second clutch to thereby establish a forward motor drive mode in which the vehicle is driven in a forward direction by the electric motor, (e) a forward-engine-drive control device for engaging at least the second clutch to establish an engine-drive mode in which the vehicle is driven in the forward direction by the engine, and (f) a second-clutch control device operable upon switching of a vehicle drive mode from the forward motor drive mode to the forward engine drive mode, for engaging the second clutch only after the engine speed has exceeded the motor speed.
43 Citations
1 Claim
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1. A hybrid drive system for an automotive vehicle comprising:
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(a) a vehicle drive power source including an engine operable by combustion of a fuel to generate a drive force, and an electric motor;
(b) a transmission;
(c) a clutch of a frictional coupling type disposed between said engine and said transmission;
(d) clutch-slip control means operable upon switching of a vehicle drive mode from a motor drive mode in which the automotive vehicle is driven by operation of said electric motor only, to an engine drive mode in which the automotive vehicle is driven by operation of said engine, said clutch-slip control means effecting a slipping engagement of said clutch; and
(e) transition-input-torque estimating means for estimating an input torque of said transmission on the basis of an engaging torque of said clutch during said slipping engagement of said clutch while the vehicle drive mode is switched from said motor drive mode to said engine drive mode.
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Specification