Apparatus for controlling idling rotation of engine

Claim 1

An apparatus for controlling the idling rotation of an engine comprising: a generator driven by the engine for charging a battery; a switching means for controlling an exciting current flowing through a field coil of said generator to keep the voltage generated from said generator and the voltage of said battery substantially constant; means for detecting a total excitation period C pr of said field coil in every predetermined crank angle cycle; means for computing a correction amount P E of suction air sucked into said engine in response to said detected total excitation period C pr ; and means for controlling the amount of suction air in response to said computed correction amount P E of suction air; wherein said detecting means serves to count and measure the excitation period using a clock generator.

Claim 2

An apparatus for controlling the idling rotation of an engine comprising: a generator driven by the engine for charging a battery; a switching means for controlling an exciting current flowing through a field coil of said generator to keep the voltage generated from said generator and the voltage of said battery substantially constant; means for detecting a total excitation period C pr of said field coil in every predetermined crank angle cycle; means for computing a correction amount P E of suction air sucked into said engine in response to said detected total excitation period C pr ; and means for controlling the amount of suction air in response to said computed correction amount P E of suction air; wherein said detecting means serves to count and measure the excitation period using a clock generator.

Claim 3

An apparatus for controlling the idling rotation of an engine comprising: a generator driven by the engine for charging a battery; a switching means for controlling an exciting current flowing through a field coil of said generator to keep the voltage generated from said generator and the voltage of said battery substantially constant; means for detecting a total excitation period C pr of said field coil in every predetermined crank angle cycle; means for computing a correction amount P E of suction air sucked into said engine in response to said detected total excitation period C pr ; and means for controlling the amount of suction air in response to said computed correction amount P E of suction air; wherein said detecting means comprises: a clock generator for generating a clock signal; a switching transistor connected to receive an output of said switching means at a base terminal thereof so that said transistor is controlled to be conductive when no exciting current flows through said field coil; a counter initialized for every crank angle cycle for counting said clock signal only when said switching transistor is non-conductive and for outputting a count value representing said total excitation period C pr every crank angle cycle to said computing means.

Claim 4

An apparatus for controlling the idling rotation of an engine comprising: a generator driven by the engine for charging a battery; a switching means for controlling an exciting current flowing through a field coil of said generator to keep the voltage generated from said generator and the voltage of said battery substantially constant; means for detecting a total excitation period C pr of said field coil in every predetermined crank angle cycle; means for computing a correction amount P E of suction air sucked into said engine in response to said detected total excitation period C pr ; and means for controlling the amount of suction air in response to said computed correction amount P E of suction air; wherein said detecting means comprises: a clock generator for generating a clock signal; a switching transistor connected to receive an output of said switching means at a base terminal thereof so that said transistor is controlled to be conductive when no exciting current flows through said field coil; a counter initialized for every crank angle cycle for counting said clock signal only when said switching transistor is non-conductive and for outputting a count value representing said total excitation period C pr every crank angle cycle to said computing means.

Claim 5

An apparatus for controlling the idling rotation of an engine comprising: a generator driven by the engine for charging a battery; a switching means for controlling an exciting current flowing through a field coil of said generator to keep the voltage generated from said generator and the voltage of said battery substantially constant; means for detecting a total excitation period C pr of said field coil in every predetermined crank angle cycle; means for computing a correction amount P E of suction air sucked into said engine in response to said detected total excitation period C pr ; and means for controlling the amount of suction air in response to said computed correction amount P E of suction air; wherein said computing means executes a calculation of an average excitation period C pa (n) (n: any integer) corresponding to an n-th cycle of said crank angle cycles according to the following equation: C.sub.pa(n) =K·C.sub.pa(n-1) +(1-K)C.sub.pr(n) where K is a filter constant and less than 1, and C pr (n) is a total excitation period in said n-th crank angle cycle, and computes said correction amount P E of the suction air in accordance with said average excitation period C pa (n).

Claim 6

An apparatus for controlling the idling rotation of an engine comprising: a generator driven by the engine for charging a battery; a switching means for controlling an exciting current flowing through a field coil of said generator to keep the voltage generated from said generator and the voltage of said battery substantially constant; means for detecting a total excitation period C pr of said field coil in every predetermined crank angle cycle; means for computing a correction amount P E of suction air sucked into said engine in response to said detected total excitation period C pr ; and means for controlling the amount of suction air in response to said computed correction amount P E of suction air; wherein said computing means executes a calculation of an average excitation period C pa (n) (n: any integer) corresponding to an n-th cycle of said crank angle cycles according to the following equation: C.sub.pa(n) =K·C.sub.pa(n-1) +(1-K)C.sub.pr(n) where K is a filter constant and less than 1, and C pr (n) is a total excitation period in said n-th crank angle cycle, and computes said correction amount P E of the suction air in accordance with said average excitation period C pa (n).

Claim 9

An apparatus for controlling an idling rotation of an engine which is adapted to drive a generator having a field coil for charging a battery, said apparatus comprising: producing means for producing an output representing a first state when an exciting current flows through said field coil and for producing an output representing a second state which is different from the first state when the exciting current stops flowing through said field coil to maintain a voltage generated from said generator and a voltage of said battery substantially constant; detecting means, responsive to the output of said producing means, for detecting a total excitation period of said field coil in every predetermined crank angle cycle; computing means for computing a correction amount of air sucked into said engine in response to the detected excitation period; and controlling means for controlling an amount of sucked air in response to the computed correction amount; wherein said detecting means serves to count and measure the excitation period using a clock generator.

Claim 10

An apparatus for controlling an idling rotation of an engine which is adapted to drive a generator having a field coil for charging a battery, said apparatus comprising: producing means for producing an output representing a first state when an exciting current flows through said field coil and for producing an output representing a second state which is different from the first state when the exciting current stops flowing through said field coil to maintain a voltage generated from said generator and a voltage of said battery substantially constant; detecting means, responsive to the output of said producing means, for detecting a total excitation period of said field coil in every predetermined crank angle cycle; computing means for computing a correction amount of air sucked into said engine in response to the detected excitation period; and controlling means for controlling an amount of sucked air in response to the computed correction amount; wherein said detecting means serves to count and measure the excitation period using a clock generator.

Claim 11

An apparatus for controlling an idling rotation of an engine which is adapted to drive a generator having a field coil for charging a battery, said apparatus comprising: producing means for producing an output representing a first state when an exciting current flows through said field coil and an output representing a second state which is different from the first state when the exciting current stops flowing through said field coil to maintain a voltage generated from said generator and a voltage of said battery substantially constant; detecting means, responsive to the outputs of said producing means, for detecting a total excitation period of said field coil in every predetermined crank angle cycle; averaging means, responsive to said detecting means, for averaging the detected excitation period; computing means for computing a correction amount of air sucked into said engine in response to the output of said averaging means; and controlling means for controlling an amount of sucked air in response to the computed correction amount; wherein said detecting means serves to count and measure the excitation period using a clock generator.

Claim 12

An apparatus for controlling an idling rotation of an engine which is adapted to drive a generator having a field coil for charging a battery, said apparatus comprising: producing means for producing an output representing a first state when an exciting current flows through said field coil and an output representing a second state which is different from the first state when the exciting current stops flowing through said field coil to maintain a voltage generated from said generator and a voltage of said battery substantially constant; detecting means, responsive to the outputs of said producing means, for detecting a total excitation period of said field coil in every predetermined crank angle cycle; averaging means, responsive to said detecting means, for averaging the detected excitation period; computing means for computing a correction amount of air sucked into said engine in response to the output of said averaging means; and controlling means for controlling an amount of sucked air in response to the computed correction amount; wherein said detecting means serves to count and measure the excitation period using a clock generator.