Control system for electric shift apparatus
First Claim
1. A control system for use with a motor vehicle transmission of the type providing a plurality of shift mode positions and including a mode select member selectively movable to selectively provide the various shift mode positions, said system comprising:
- a control assembly adapted to be positioned in the passenger compartment of the vehicle and including operator accessible means for generating a plurality of operator request signals corresponding respectively to each transmission shift position; and
means operative in response to operator generation of an operator request signal to move said mode select member at an initial speed that varies with the distance that the mode select member must move to achieve the shift position corresponding to the operator request signal.
5 Assignments
0 Petitions
Accused Products
Abstract
A control system for an electric shift apparatus for a motor vehicle having an automatic transmission. The apparatus includes a power module adapted to be mounted on the housing of the transmission proximate the transmission mode select shaft and a control module adapted to be mounted in the passenger compartment. The power module includes an electric motor driving a speed reduction unit which in turn drives the transmission mode select shaft. The control module includes a logic module and a plurality of push button members corresponding respectively to the transmission shift positions. An encoder wheel provides a constant coded signal indicating the instantaneous position of the transmission mode select shaft. The logic module compares the present transmission position to the selected shift position and generates a signal to the motor to move the mode select shaft in a direction to achieve the selected shift position and stop the motor assembly when the encoder signal matches the selected shift position. The logic module provides a closed loop control system which, in the situation where the requested new position is only one position away from the present transmission position, moves the mode select shaft at a relatively slow speed and, in the situation where the requested position is more than one position away from the present transmission position, initially moves the mode select shaft at the relatively rapid speed and thereafter, as the mode select shaft reaches a position within one position of the requested position, moves the mode select shaft at the relatively slow speed to ensure accurate positioning of the mode select member without overshoot.
54 Citations
23 Claims
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1. A control system for use with a motor vehicle transmission of the type providing a plurality of shift mode positions and including a mode select member selectively movable to selectively provide the various shift mode positions, said system comprising:
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a control assembly adapted to be positioned in the passenger compartment of the vehicle and including operator accessible means for generating a plurality of operator request signals corresponding respectively to each transmission shift position; and means operative in response to operator generation of an operator request signal to move said mode select member at an initial speed that varies with the distance that the mode select member must move to achieve the shift position corresponding to the operator request signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 16)
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11. A control system for use with a motor vehicle transmission of the type providing a plurality of shift positions and including a mode select member selectively rotatable between a plurality of discrete angular positions to selectively provide the various shift mode positions, said system comprising:
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a control assembly adapted to be positioned in the passenger compartment of the motor vehicle and including operator accessible means for generating a plurality of operator request signals corresponding respectively to each transmission shift position; power means drivingly connected to said mode select member; means generating a present transmission position signal; and comparator means receiving an operator request signal and a present transmission position signal and operative to generate a command signal coded to rotate said mode select member in a clockwise or counterclockwise direction and further coded to rotate said mode select member at an initial angular speed that varies with the angular distance that the mode select member must be moved to achieve the requested shift position. - View Dependent Claims (12, 13, 14, 15)
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17. In a motor vehicle transmission assembly including an automatic transmission having a mode select member selectably movable to selectively provide the various shift mode positions of the transmission, a control assembly adapted to be positioned in the passenger compartment of the vehicle and including operator accessible means for generating a plurality of operator request signals corresponding respectively to each transmission shift position, a power module drivingly connected to said mode select member, and a control logic system operative in response to operator generation of an operator request signal to move said mode select member to the position corresponding to the operator request signal, the improvement wherein:
said control system is operative to move said mode select member in response to operator generation of an operator request signal at an initial speed that varies with the distance that the mode select member must move to achieve the shift position corresponding to the operator request signal. - View Dependent Claims (18, 19, 20, 21, 22, 23)
Specification