Method and apparatus to control engine stop for a hybrid powertrain system
First Claim
1. Method to control operation of a hybrid powertrain to stop an internal combustion engine the powertrain comprising the internal combustion engine and first and second electrical machines and an electro-mechanical transmission selectively operative to transmit torque therebetween, the method comprising the following steps in the sequence set forth:
- first, controlling engine operation to stop firing the engine and minimize intake manifold absolute pressure;
then,controlling a damper clutch to lock rotation of the engine and the electro-mechanical transmission;
then,selectively controlling torque outputs from the first and second electrical machines to reduce engine speed; and
then,selectively controlling torque outputs from the first and second electrical machines to stop rotation of the engine substantially near a predetermined crank position.
12 Assignments
0 Petitions
Accused Products
Abstract
A control scheme is provided for stopping an internal combustion engine of a hybrid powertrain during ongoing vehicle operation. The method, executed as program code in an article of manufacture comprises the following steps in the sequence set forth. First, engine operation is controlled to stop firing the engine. A damper clutch is controlled to lock rotation of the engine and the electro-mechanical transmission. Torque outputs from the first and second electrical machines are then selectively controlled to reduce engine speed. Torque outputs from the first and second electrical machines are then selectively controlled to stop rotation of the engine substantially near a predetermined crank position.
25 Citations
19 Claims
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1. Method to control operation of a hybrid powertrain to stop an internal combustion engine the powertrain comprising the internal combustion engine and first and second electrical machines and an electro-mechanical transmission selectively operative to transmit torque therebetween, the method comprising the following steps in the sequence set forth:
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first, controlling engine operation to stop firing the engine and minimize intake manifold absolute pressure;
then,controlling a damper clutch to lock rotation of the engine and the electro-mechanical transmission;
then,selectively controlling torque outputs from the first and second electrical machines to reduce engine speed; and
then,selectively controlling torque outputs from the first and second electrical machines to stop rotation of the engine substantially near a predetermined crank position. - View Dependent Claims (2, 3)
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4. Method to control operation of a hybrid powertrain to stop an internal combustion engine the powertrain comprising the internal combustion engine and an electrical machine and an electro-mechanical transmission selectively operative to transmit torque therebetween, the program comprising the following steps in the sequence set forth:
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first, selectively controlling the electro-mechanical transmission to a continuously variable mode of operation;
then,controlling engine operation to stop firing the engine and minimize intake manifold absolute pressure;
then,controlling a damper clutch to lock rotation of the engine and the electro-mechanical transmission;
then,selectively controlling torque output from the electrical machine to reduce engine speed; and
then,selectively controlling torque output from the electrical machine to stop rotation of the engine substantially near a predetermined crank position.
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5. Article of manufacture, comprising a storage medium having machine-executable code encoded therein for controlling operation of a powertrain to stop an internal combustion engine during ongoing vehicle operation the powertrain comprising the internal combustion engine and first and second electrical machines and an electro-mechanical transmission selectively operative to transmit torque therebetween, the program comprising the following steps in the sequence set forth:
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first, code to control engine operation to stop firing the engine;
then,code to control a damper clutch to lock rotation of the engine and the electro-mechanical transmission;
then,code to selectively control torque outputs from the first and second electrical machines to reduce engine speed;
then,code to selectively control torque outputs from the first and second electrical machines to stop rotation of the engine substantially near a predetermined crank position. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification