US 4,862,851 A · Idling engine speed controlling apparatus

Abstract

An idling engine speed controlling apparatus has a feed-back control system to regulate engine speed to a target speed such that a torque disturbance is directly detected to convert it into a signal so that an air-flow rate or ignition timing is controlled on the basis of the sum of the signal and a time-differential of the signal, or such that sub-feed-back compensation is given to the output end of a proportional and integral controller so that an amount of air flowing in a intake air conduit is compensated with the first-order-lag component or an amount of air is controlled in response to the first-order-lag component or the second-order-lag component or the sum of or the difference between these components, or such that an output from the proportional and integral controller or an output from the actuator is fed back to the input side of the controller so as to include a transfer function of the actuator through a detection circuit.

Claims16

Dependent claims

An idling engine speed controlling apparatus for an internal combustion engine comprising:

an intake air conduit formed to by-pass a throttle value,
an actuator for controlling air flowing in said intake air conduit and a detecting means for detecting an idling speed of said engine to thereby control by feeding back the idling speed to be a predetermined value, said idling engine speed controlling apparatus being characterized by comprising
means for detecting a torque disturbance to said engine to convert it into an electric signal depending on the magnitude of the disturbance, and
a control means for controlling a parameter of the engine selected from the group of air-flow rate or ignition timing in response to a signal wherein said signal is in proportion to the sum of said electric signal and a time-differential component of said electric signal.

1 more element

An idling engine speed controlling apparatus for an internal combustion engine which comprises:

an engine speed detecting circuit for detecting an idling speed of said engine,
a setting speed circuit for outputting a set signal corresponding to a target speed on said engine, a proportional and integral controller for amplifying and integrating an error produced between a signal detected by said engine speed detecting circuit and said set signal,
a feed-back control system which gives sub-feed-back compensation to the output end of said proportional and integral controller so that an amount of air flowing in an intake air conduit by-passing a throttle value is compensated with the first-order-lag component caused by the change of a state quantity which represents the condition of said engine, or which controls said amount of air in response to a component selected from the group of the first-order-lag component, the second-order-lag component caused by the change of an operational parameter of said engine, or the sum of or the difference between these components, and
an actuator for controlling an air-flow rate in said intake air conduit by the output of said proportional and integral controller to thereby coincide the idling speed with the target speed.

1 more element

Dependencies are inferred from the claim text.

Idling engine speed controlling apparatus

Life of this patent

Idling engine speed controlling apparatus

Life of this patent

Abstract

Claims16