Automatic transmission control system for automatic transmissions on vehicles

Claim 2

An automatic transmission control system for vehicles having engines and using automatic transmission having gear-shifting mechanisms, comprising: vehicle speed detector means for operative connection to said vehicle to produce an output signal at frequencies proportional to the vehicle speed, AC-DC converter means connected to said detector means to convert the output signal of said vehicle speed detector into a corresponding analog signal, engine load detector means for operative connection to the engine of said vehicle to produce an output signal corresponding to the engine throttle valve opening or engine intake negative pressure, gear-shift signal generator circuit means connected to said ACDC converter and load detector means to generate a gear-shift signal by detecting certain relationships between the output signals of said AC-DC converter means and said engine load detector means, memory means connected to and producing an output signal in accordance with the output signal of said gear-shift signal generator circuit means means connected between said load detector and memory means for causing the output signal of said memory means to be locked upon appearance from said engine load detector means of a signal indicating the ''''cut-off'''' state of the engine throttle valve, vehicle low speed detector means connected between said speed detector and memory means and including a charging-anddischarging capacitor and a constant-voltage detection element for producing an output signal for releasing the output-locking state of said memory means by detecting a predetermined low vehicle speed from the output signal of said first-mentioned vehicle speed detector means, and means connected to said memory means for operative connection to the automatic transMission of said vehicle to execute the shifting of the transmission gear-shifting mechanism thereof in accordance with the output signal of said memory means.

Claim 3

An automatic transmission control system for vehicles having engines and using automatic transmission having gear-shifting mechanisms, comprising: vehicle speed detector means for operative connection to said vehicle to produce an output signal at frequencies proportional to the vehicle speed, AC-DC converter means connected to said detector means to convert the output signal of said vehicle speed detector into a corresponding analog signal, engine load detector means for operative connection to the engine of said vehicle to produce an output signal corresponding to the engine throttle valve opening or engine intake negative pressure, gear-shift signal generator circuit means connected to said AC-DC converter and load detector means to generate a gear-shift signal by detecting certain relationships between the output signals of said AC-DC converter means and said engine load detector means, memory means connected to and producing an output signal in accordance with the output signal of said gear-shift signal generator circuit means means connected between said load detector and memory means for causing the output signal of said memory means to be locked upon appearance from said engine load detector means of a signal indicating the ''''cut-off'''' state of the engine throttle valve, vehicle low speed detector means connected between said speed detector and memory means and including a charging-and-discharging capacitor and a constant-voltage detection element for producing an output signal for releasing the output-locking state of said memory means by detecting a predetermined low vehicle speed from the output signal of said first-mentioned vehicle speed detector means, and means connected to said memory means for operative connection to the automatic transMission of said vehicle to execute the shifting of the transmission gear-shifting mechanism thereof in accordance with the output signal of said memory means.

Claim 4

An automatic transmission control system for vehicles having engines and using automatic transmission having gear-shifting mechanisms, comprising: vehicle speed detector means for operative connection to said vehicle to produce an output signal at frequencies proportional to the vehicle speed, AC-DC converter means connected to said detector means to convert the output signal of said vehicle speed detector into a corresponding analog signal, engine load detector means for operative connection to the engine of said vehicle to produce an output signal corresponding to the engine throttle valve opening or engine intake negative pressure, gear-shift signal generator circuit means connected to said AC-DC converter and load detector means to generate a gear-shift signal by detecting certain relationships between the output signals of said AC-DC converter means and said engine load detector means, memory means connected to and producing an output signal in accordance with the output signal of said gear-shift signal generator circuit means means connected between said load detector and memory means for causing the output signal of said memory means to be locked upon appearance from said engine load detector means of a signal indicating the ''''cut-off'''' state of the engine throttle valve, vehicle low speed detector means connected between said speed detector and memory means and including a charging-and-discharging capacitor and a constant-voltage detection element for producing an output signal for releasing the output-locking state of said memory means by detecting a predetermined low vehicle speed from the output signal of said first-mentioned vehicle speed detector means, and means connected to said memory means for operative connection to the automatic transMission of said vehicle to execute the shifting of the transmission gear-shifting mechanism thereof in accordance with the output signal of said memory means.

Claim 5

The automatic transmission control system according to claim 1, wherein said vehicle low speed detector means includes: a first transistor circuit to receive the input signal from said first mentioned speed detector, an integrating circuit including said capacitor and connected to receive the output of said first transistor circuit, a constant-voltage diode as said constant-voltage detection element, and a second transistor circuit connected to receive the output of said integrating circuit through said constant-voltage diode.

Claim 6

The automatic transmission control system according to claim 1, wherein said memory means includes: two bistable multi-vibrator circuits having outputs connected to said shifting means and having inputs, an input circuit connected between said inputs and the outputs of said gear-shift signal generator circuit means to produce a trigger signal for triggering said bistable multi-vibrators, and a transistor circuit means connected between said input circuit and said vehicle low speed detector means to restrict the action of said input circuit by grounding said input circuit upon receipt of said output signal from said vehicle low speed detector means.

Claim 7

An automatic transmission control system for vehicles having engines with throttle valves and using automatic transmissions having gear-shifting mechanisms, comprising: means including a vehicle speed detector for operative connection to a said vehicle for producing an output signal proportional to the vehicle speed, engine load detector means for operative connection to the engine of said vehicle to produce an output signal corresponding to the engine load, gear-shift signal generator means connected to said vehicle speed detector means and load detector means for generating output signals upon detecting certain gear-shift relationships between the aforesaid output signals thereof, memory means connected to said gear-shift signal generator means for producing an output signal in accordance with the output signal thereof, means connected between said load detector and memory means for causing the output signal of said memory means to be locked upon appearance from said engine load detector means of a signal indicating the ''''cut-off'''' state of the engine throttle valve, vehicle low speed detector means connected between said first mentioned speed detector and memory means for producing an output signal for releasing the output-locking state of said memory means by detecting a predetermined low vehicle speed from the output signal of said first-mentioned vehicle speed detector means, and means connected to said memory means for operative connection to the automatic transmission of said vehicle to execute the shifting of the transmission gear-shifting mechanism thereof in accordance with the output signal of said memory means.

Claim 8

An automatic transmission control system for vehicles having engines with throttle valves and using automatic transmissions having gear-shifting mechanisms, comprising: means including a vehicle speed detector for operative connection to a said vehicle for producing an output signal proportional to the vehicle speed, engine load detector means for operative connection to the engine of said vehicle to produce an output signal corresponding to the engine load, gear-shift signal generator means connected to said vehicle speed detector means and load detector means for generating output signals upon detecting certain gear-shift relationships between the aforesaid output signals thereof, memory means connected to said gear-shift signal generator means for producing an output signal in accordance with the output signal thereof, means connected between said load detector and memory means for causing the output signal of said memory means to be locked upon appearance from said engine load detector means of a signal indicating the ''''cut-off'''' state of the engine throttle valve, vehicle low speed detector means connected between said first mentioned speed detector and memory means for producing an output signal for releasing the output-locking state of said memory means by detecting a predetermined low vehicle speed from the output signal of said first-mentioned vehicle speed detector means, and means connected to said memory means for operative connection to the automatic transmission of said vehicle to execute the shifting of the transmission gear-shifting mechanism thereof in accordance with the output signal of said memory means.