US 4,039,061 A · Automatically controlling the transmission ratios of an automotive vehicle engine for decreasing the vehicle speed

Abstract

Automatically controlling the transmission ratios of an automotive vehicle engine by detecting the speed of the engine, generating a signal proportional to the detected speed and comparing this signal with different predetermined reference speed signals, detecting the transmission ratio of the transmission, comparing this ratio with a predetermined reference ratio and generating a ratio signal as long as the detected ratio remains below the reference ratio, maintaining the detected ratio constant until the detected engine speed signal falls below the predetermined reference speed signal and generating a signal to increase the transmission ratio when the engine speed signal falls below the predetermined reference speed signal, and increasing the transmission ratio in the direction of the reference ratio as long as the detected speed signal remains below the predetermined reference speed signal and the detected ratio is less than the reference ratio.

Claims12

Dependent claims

In a vehicle having an engine driving the wheels of the vehicle through a variable speed ratio transmission, means to vary the ratio of the transmission, engine speed control means and manual braking means, a method for controlling the transmission ratio for braking the vehicle, comprising the steps of:

detecting the speed of said engine and generating a signal proportional to the detected speed;
comparing the detected engine speed signal with a predetermined reference speed signal;
detecting the transmission ratio of said transmission and comparing the detected ratio with a predetermined reference ratio;
generating a ratio signal as long as the detected ratio remains below said reference ratio;
maintaining the detected ratio constant until said detected engine speed signal falls below said predetermined reference speed signal;
generating a signal to increase said transmission ratio when said engine speed signal falls below said predetermined reference speed signal;
and
increasing said transmission ratio in the direction of said predetermined reference ratio as long as said detected speed signal remains below said reference speed signal and said detected ratio is less than said reference ratio.

5 more elements

In a vehicle having an engine driving the wheels of the vehicle through a variable speed ratio transmission, means to vary the ratio of the transmission, engine speed control means and manual braking means, apparatus for controlling the transmission ratio for braking the vehicle, comprising:

first comparator means comparing a measured transmission ratio of said transmission with a preset reference ratio and generating an output signal when the measured ratio is not greater than said reference ratio;
second comparator means for comparing a measured speed of said engine with a preset reference speed and generating an output signal when said measured speed is less than said reference speed;
and
means coupling the outputs of said first and second comparator means to said transmission ratios varying means for increasing said transmission ratio in response to output signals generated by both of said first and second comparator means concurrently.

1 more element

Dependencies are inferred from the claim text.

Automatically controlling the transmission ratios of an automotive vehicle engine for decreasing the vehicle speed

Life of this patent

Automatically controlling the transmission ratios of an automotive vehicle engine for decreasing the vehicle speed

Life of this patent

Abstract

Claims12