Apparatus for controlling engine idle speed in a vehicle having an anti-skid brake system

Claim 1

An apparatus for controlling an idle speed of an engine in a vehicle adapted for driving on a road, the apparatus comprising: a driven-wheel speed detector for producing an output that is a measure of the rotational speed of the driven wheel; a vehicle speed detector for producing an output that is a measure of speed of the vehicle; a reference driven-wheel speed setting circuit connected to the driven-wheel speed detector and to the vehicle speed detector for producing an output that differs by a predetermined value from the output of the vehicle speed detector; a comparison adjuster for comparing the output of the reference driven-wheel speed setting circuit with the output of the driven-wheel speed detector and for generating a control output signal λD when the output of the driven-wheel speed detector is smaller than the output of the reference driven-wheel speed setting circuit; an anti-skid brake apparatus in which a brake-relieving signal is generated when excessive brake force is applied and a brake fluid pressure is controlled by said brake-relieving signal for preventing said wheel from locking; means for generating signals BLS, ACL, MG, and CL indicative of the condition of said vehicle's brake pedal, accelerator pedal, transmission, and clutch, respectively; an engine brake detector comprising (a) first detecting means to which is supplied a signal BLS representing the brake pedal not being operated, the control output signal λD from the comparison adjuster, a signal ACL representing the accelerator pedal not being operated, and at least one of a signal MG representing the transmission gear not being located at the neutral gear position and another signal CL representing the clutch being connected, said first means producing an output when all of said signals, BLS, λD, ACL, and MG or CL are generated, (b) second detecting means to which is supplied a signal BLS representing the brake pedal being operated, the brake-relieving signal from the anti-skid brake apparatus and the control output signal λD from said comparison adjuster, said second means producing an output when all of said signals BLS, λD, and said brake-relieving signal are generated continuously for longer than a predetermined time, and (c) third detecting means to which said outputs of the first and second means are supplied and which produces an output EB when at least one of said outputs from said first and second means is generated; and an idle speed controller for controlling an idle speed of the engine which receives a control output signal λS from said comparison adjuster and said output EB from said engine brake detector, said idle speed controller being so adjusted that said driven-wheel is rotated at said reference driven-wheel speed when the engine brake application is detected by said engine brake detector.

Claim 2

An apparatus for controlling an idle speed of an engine in a vehicle adapted for driving on a road, the apparatus comprising: a driven-wheel speed detector for producing an output that is a measure of the rotational speed of the driven wheel; a vehicle speed detector for producing an output that is a measure of speed of the vehicle; a reference driven-wheel speed setting circuit connected to the driven-wheel speed detector and to the vehicle speed detector for producing an output that differs by a predetermined value from the output of the vehicle speed detector; a comparison adjuster for comparing the output of the reference driven-wheel speed setting circuit with the output of the driven-wheel speed detector and for generating a control output signal λD when the output of the driven-wheel speed detector is smaller than the output of the reference driven-wheel speed setting circuit; an anti-skid brake apparatus in which a brake-relieving signal is generated when excessive brake force is applied and a brake fluid pressure is controlled by said brake-relieving signal for preventing said wheel from locking; means for generating signals BLS, ACL, MG, and CL indicative of the condition of said vehicle's brake pedal, accelerator pedal, transmission, and clutch, respectively; an engine brake detector comprising (a) first detecting means to which is supplied a signal BLS representing the brake pedal not being operated, the control output signal λD from the comparison adjuster, a signal ACL representing the accelerator pedal not being operated, and at least one of a signal MG representing the transmission gear not being located at the neutral gear position and another signal CL representing the clutch being connected, said first means producing an output when all of said signals, BLS, λD, ACL, and MG or CL are generated, (b) second detecting means to which is supplied a signal BLS representing the brake pedal being operated, the brake-relieving signal from the anti-skid brake apparatus and the control output signal λD from said comparison adjuster, said second means producing an output when all of said signals BLS, λD, and said brake-relieving signal are generated continuously for longer than a predetermined time, and (c) third detecting means to which said outputs of the first and second means are supplied and which produces an output EB when at least one of said outputs from said first and second means is generated; and an idle speed controller for controlling an idle speed of the engine which receives a control output signal λS from said comparison adjuster and said output EB from said engine brake detector, said idle speed controller being so adjusted that said driven-wheel is rotated at said reference driven-wheel speed when the engine brake application is detected by said engine brake detector.