Transmission shifting control system
First Claim
1. A transmission shifting control system for a motor vehicle, comprising electrically operated means movable between a first position to connect two sections of a shift linkage of a transmission of the vehicle to allow shifting of said transmission and a second position to disconnect said two sections of said shift linkage from each other to inhibit shifting of said transmission, first sensing means sensing that the driver sits down on his seat of the vehicle to produce a first output signal and sensing that the driver is absent from his seat to produce a second output signal, second sensing means sensing that the driver fails to carry out a precautionary procedure for his safety and protection when said first sensing means produces said first output signal to produce an output signal, and an electric control circuit connect to said first and second sensing means and to said electric operated means and responsive to said output signal of said second sensing means to produce an output signal to move said electrically operated means from said first position into said second position to inhibit shifting of said transmission.
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Accused Products
Abstract
A bistable memory circuit is set by a first output signal produced when the driver is absent from his seat of the vehicle to produce an output signal and is reset by a second output signal produced when the driver sits down on his seat but fails to carry out a precautionary safety procedure to protect him to cease to produce the output signal. An AND gate circuit produces an output signal only when an output signal produced when the driver sits down on his seat and the output signal of the bistable memory circuit are concurrently present. An OR gate circuit produces an output signal when at least one of the second output signal and the output signal of the AND gate circuit is present to energize a solenoid to render shifting of the transmission from a parking or neutral position into a driving gear impossible.
18 Citations
8 Claims
- 1. A transmission shifting control system for a motor vehicle, comprising electrically operated means movable between a first position to connect two sections of a shift linkage of a transmission of the vehicle to allow shifting of said transmission and a second position to disconnect said two sections of said shift linkage from each other to inhibit shifting of said transmission, first sensing means sensing that the driver sits down on his seat of the vehicle to produce a first output signal and sensing that the driver is absent from his seat to produce a second output signal, second sensing means sensing that the driver fails to carry out a precautionary procedure for his safety and protection when said first sensing means produces said first output signal to produce an output signal, and an electric control circuit connect to said first and second sensing means and to said electric operated means and responsive to said output signal of said second sensing means to produce an output signal to move said electrically operated means from said first position into said second position to inhibit shifting of said transmission.
Specification