Deceleration control system for automobiles

Claim 2

A deceleration control system for an automobile provided with an engine, drive wheels, a braking system including a brake pedal and wheel brakes, and a continuously variable transmission interposed between said engine and said drive wheels, the reduction ratio of said transmission being continuously variable in accordance with an operatiiig signal appplied to an actuating terminal for controlling said reduction ratio; said deceleration control system comprising: an engine speed detector for detecting the rotational speed of said engine; an engine brake controller for producing a signal corresponding to the amount of operation on said brake pedal by a driver so as to apply said signal to said actuating terminal thereby to change said reduction ratio; and a wheel brake controller for operating said wheel brakes, when the engine speed detected by said engine speed detector has reached a predetermined level, so that said engine speed will not exceed said predetermined level.

Claim 4

The system of claim 1, wherein said continuously variable transmission is of a hydromechanical type.

Claim 5

The system of claim 2, wherein said continuously variable transmission comprises a combination of a first hydraulic pump/motor of a variable displacement type connected to the output of said engine and a second hydraulic pump/motor of a variable displacement type connected to said drive wheels, with the inlet/outlet ports of said first hydraulic pump/motor communicating with the inlet/outlet ports of said second hydraulic pump/motor.

Claim 6

The system of claim 3. wherein said continuously variable transmission comprises a combination of a hydraulic pump/motor of a variable displacement type connectable to the output of said engine through a gear and clutch mechanism and a hydraulic pump/motor of a variable displacement type connectable to said drive wheels through said gear and clutch mechanism, with the inlet/outlet ports of one of said hydraulic pump/motors communicating with the inlet/outlet ports of the other of said hydraulic pump/motors.

Claim 7

A deceleration control system for an automobile provided with an engine, drive wheels, a braking system including a brake pedal and wheel brakes, and a continuously variable transmission interposed between said engine and said drive wheels, the reduction ratio of said transmission being continuously variable in accordance with an operating signal appplied to an actuating terminal for controlling said reduction ratio; said deceleration control system comprising: an engine speed detector for detecting the rotational speed of said engine; a brake effect detector for detecting the effect of braking; an engine brake controller for producing a signal corresponding to the amount of operation on said brake pedal by a driver so as to apply said signal to said actuating terminal thereby to change said reduction ratio; a control amount corrector for correcting said signal to be applied to said actuating terminal in such. a manner that when the offset of braking detected by said brake effect detector has exceeded a predetermined value, said reduction ratio is reduced so as to offset said excessive amount; and a wheel brake controller for operating said wheel brakes, when the engine speed detected by said engine speed detector has reached a predetermined level, so that said engine speed will not exceed said predetermined level.

Claim 8

A deceleration control system for an automobile provided with an engine, drive wheels, a braking system including a brake pedal and wheel brakes, and a continuously variable transmission interposed between said engine and said drive wheels, the reduction ratio of said transmission being continuously variable in accordance with an operating signal appplied to an actuating terminal for controlling said reduction ratio; said deceleration control system comprising: an engine speed detector for detecting the rotational speed of said engine; a brake effect detector for detecting the effect of braking; an engine brake controller for producing a signal corresponding to the amount of operation on said brake pedal by a driver so as to apply said signal to said actuating terminal thereby to change said reduction ratio; a control amount corrector for correcting said signal to be applied to said actuating terminal in such. a manner that when the offset of braking detected by said brake effect detector has exceeded a predetermined value, said reduction ratio is reduced so as to offset said excessive amount; and a wheel brake controller for operating said wheel brakes, when the engine speed detected by said engine speed detector has reached a predetermined level, so that said engine speed will not exceed said predetermined level.

Claim 9

The system of claim 6, wherein said brake effect detector comprises a brake torque detector for detecting the countertorque said drive wheels exert on said transmission.

Claim 10

The system of claim 6, wherein said continuously variable transmission is of a hydrostatic type.

Claim 11

The system of claim 6, wherein said continuously variable transmission is of a hydromechanical type.

Claim 12

The system of claim 8, wherein said continuously variable transmission comprises a combination of a first hydraulic pump/motor of a variable displacement type connected to the output of said engine and a second hydraulic pump/motor of a variable displacement type connected to said drive wheels, with the inlet/outlet ports of said first hydraulic pump/motor communicating with the inlet/outlet ports of said second hydraulic pump/motor.

Claim 13

The system of claim 9, wherein said continuously variable transmission comprises a combination of a hydraulic pump/motor of a variable displacement type connectable to the output of said engine through a gear and clutch mecahnism and a hydraulic pump/motor of a variable displacement type connectable to said drive wheels through said gear and clutch mechanism, with the inlet/outlet ports of one of said hydraulic pump/motors communicating with the inlet/outlet ports of the other of said hydraulic pump/motors.

Claim 14

A decelaration control system for an automobile provided with an engine, drive wheels, a braking system including a brake pedal and wheel brakes, and a continuously variable transmission interposed between said engine and said drive wheels, the reduction ratio of said transmission being continuously variable in accordance with an operating signal applied to an actuating terminal for controlling said reduction ratio; said deceleration control system comprising: an engine speed detector for detecting the rotational speed of said engine; an engine speed setting device for determining the engine speed for engine brake corresponding to the amount of operation on said brake pedal when said brake pedal has been stepped on; and a reduction ratio adjuster for adjusting the reduction ratio of said transmission so that the engine speed detected by said engine speed detector approaches or conforms to said engine speed for engine brake.

Claim 15

A decelaration control system for an automobile provided with an engine, drive wheels, a braking system including a brake pedal and wheel brakes, and a continuously variable transmission interposed between said engine and said drive wheels, the reduction ratio of said transmission being continuously variable in accordance with an operating signal applied to an actuating terminal for controlling said reduction ratio; said deceleration control system comprising: an engine speed detector for detecting the rotational speed of said engine; an engine speed setting device for determining the engine speed for engine brake corresponding to the amount of operation on said brake pedal when said brake pedal has been stepped on; and a reduction ratio adjuster for adjusting the reduction ratio of said transmission so that the engine speed detected by said engine speed detector approaches or conforms to said engine speed for engine brake.

Claim 16

The system of claim 12, wherein said continuously variable transmission is of a hydrostatic type.

Claim 17

The system of claim 12, wherein said continuously variable transmission is of a hydromechanical type.

Claim 18

The system of claim 13, wherein said continuously variable transmission comprises a combination of a first hydraulic pump/motor of a variable displacement type connected to the output of said engine and a second hydraulic pump/motor of a variable displacement type connected to said drive wheels. with the inlet/outlet ports of said first hydraulic pump/motor communicating with the inlet/outlet ports of said second hydraulic pump/motor.

Claim 19

The system of claim 14, wherein said continuously variable transmission comprises a combination of a hydraulic pump/motor of a variable displacement type connectable to the output of said engine through a gear and clutch mechanism and a hydraulic pump/motor of a variable displacement type connectable to said drive wheels through said gear and clutch mechanism, with the inlet/outlet ports of one of said hydraulic pump/motors communicating with the inlet/outlet ports of the other of said hydraulic pump/motors.

Claim 20

The system of claim 6, wherein said brake effect detector is a detector for detecting the locked condition of the wheels of said automobile.