Launch control of a hybrid electric vehicle
First Claim
1. A method for controlling a vehicle launch of a vehicle having a powertrain that includes a transmission having an input, a current gear, an input clutch associated with a target gear and an output, an engine and a first electric machine for driving the input, comprising the steps of:
- (a) determining a desired magnitude of torque to be produced at the transmission output;
(b) producing a predetermined magnitude of torque capacity of the input clutch;
(c) operating the engine such that a magnitude of torque at the transmission output is substantially equal to the desired transmission output torque;
(d) determining desired crankshaft speed and a crankshaft speed error;
(e) determining a desired change in torque at the transmission input that will reduce the crankshaft speed error;
(f) adjusting a magnitude of torque produced by the first electric machine such that the magnitude of torque at the transmission input is substantially equal to the desired torque at the transmission input; and
(g) engaging the input clutch such that no slip occurs between the crankshaft speed and clutch speed.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for controlling a vehicle launch using a transmission having an input, a current gear, an input clutch associated with a target gear and an output, an engine and an electric machine for driving the input, includes the steps of determining a desired magnitude of torque to be produced at the transmission output, producing a predetermined magnitude of torque capacity of the input clutch, operating the engine such that a magnitude of torque at the transmission output is substantially equal to the desired transmission output torque, determining an crankshaft speed error, determining a desired change in torque at the transmission input that will reduce the crankshaft speed error, adjusting a magnitude of torque produced by the first electric machine such that the magnitude of torque at the transmission input is substantially equal to the desired torque at the transmission input, and engaging the input clutch.
13 Citations
25 Claims
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1. A method for controlling a vehicle launch of a vehicle having a powertrain that includes a transmission having an input, a current gear, an input clutch associated with a target gear and an output, an engine and a first electric machine for driving the input, comprising the steps of:
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(a) determining a desired magnitude of torque to be produced at the transmission output; (b) producing a predetermined magnitude of torque capacity of the input clutch; (c) operating the engine such that a magnitude of torque at the transmission output is substantially equal to the desired transmission output torque; (d) determining desired crankshaft speed and a crankshaft speed error; (e) determining a desired change in torque at the transmission input that will reduce the crankshaft speed error; (f) adjusting a magnitude of torque produced by the first electric machine such that the magnitude of torque at the transmission input is substantially equal to the desired torque at the transmission input; and (g) engaging the input clutch such that no slip occurs between the crankshaft speed and clutch speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a powertrain that includes a transmission having an input, a current gear, an input clutch associated with a target gear and an output, an engine and a first electric machine for driving the input and a first set of vehicle wheels, and a second electric machine for driving a second set of vehicle wheels, comprising the steps of:
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(A) using an operator demand for a desired wheel torque to determine a desired wheel torque at the first wheel set and a desired wheel torque at the second wheel set; (B) operating the engine, the first electric machine and the transmission to produce the desired magnitude of torque at the first wheel set, and operating the second electric machine to produce the desired magnitude of torque at the second wheel set; (C) producing a predetermined magnitude of torque capacity of the input clutch; (D) operating the engine such that a magnitude of torque at the transmission output is substantially equal to the desired transmission output torque; (E) determining a crankshaft speed error; (F) determining a desired change in torque at the transmission input that will reduce the crankshaft speed error; (G) adjusting a magnitude of torque produced by the first electric machine such that the magnitude of torque at the transmission input is substantially equal to the desired torque at the transmission input; and (H) engaging the input clutch. - View Dependent Claims (11, 12, 13, 14)
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15. A system for controlling a vehicle launch condition comprising:
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an engine; a first electric machine; a second electric machine; a transmission including an input and an output, the transmission being able to operate in a current gear and a target gear; an input clutch for alternately closing and opening a drive connection between the engine and transmission input and between the first machine and the transmission input; and
a controller configured to determine a desired magnitude of torque to be produced at the transmission output, produce a predetermined magnitude of torque capacity of the input clutch, operate the engine such that a magnitude of torque at the transmission output is substantially equal to the desired transmission output torque, determine a crankshaft speed error, determine a desired change in torque at the transmission input that will reduce the crankshaft speed error, adjust a magnitude of torque produced by the first electric machine such that the magnitude of torque at the transmission input is substantially equal to the desired torque at the transmission input, and engage the input clutch. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A system for controlling a vehicle launch condition comprising:
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an engine; a first electric machine; a second electric machine; a transmission including an input and an output, the transmission being able to operate in a current gear and a target gear; an input clutch for alternately closing and opening a drive connection between the engine and transmission input and between the first machine and the transmission input; and a controller configured to use an operator demand for a desired wheel torque to determine a desired wheel torque at the first wheel set and a desired wheel torque at the second wheel set;
operate the engine, the first electric machine and the transmission to produce the desired magnitude of torque at the first wheel set , and operating the second electric machine to produce the desired magnitude of torque at the second wheel set;
determine a desired magnitude of torque to be produced at the transmission output;
produce a predetermined magnitude of torque capacity of the input clutch;
operate the engine such that a magnitude of torque at the transmission output is substantially equal to the desired transmission output torque;
determine an engine speed error;
determine a desired change in torque at the transmission input that will reduce the engine speed error;
adjust a magnitude of torque produced by the first electric machine such that the magnitude of torque at the transmission input is substantially equal to the desired torque at the transmission input; and
engage the input clutch. - View Dependent Claims (22, 23, 24, 25)
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Specification