Idle engine speed control apparatus
First Claim
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1. An idle engine speed control apparatus for a multiple cylinder engine, comprising:
- a throttle valve disposed in each intake manihold branch upstream of each cylinder of the engine;
means defining an air passage connected with each intake manifold branch downstream of said throttle valve;
an idle control valve disposed in each air passage, an opening state of said control valve being changeable to control an amount of air flowing in said air passage;
means setting a target value of an idle engine speed;
means for detecting a crankangle of the engine;
means for calculating an engine speed in a combustion stroke of each cylinder of the engine in accordance with said detected crankangle; and
means for feedback-controlling the opening state of said idle control valve so that the calculated engine speed is brought into agreement with said target value.
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Abstract
An idle engine speed control apparatus for a multiple cylinder and multiple throttle valve engine includes a bypass passage and an idle control valve connected to each cylinder for controlling idle engine speed. Idle engine speed at a combustion stroke of each cylinder is calculated by a control unit and adjusted to a target engine speed by feedback-controlling each idle control valve according to a signal from the control unit. Furthermore, each throttle valve and idle control valve are disposed in the vicinity of each cylinder to quickly control the engine speed in each cylinder.
18 Citations
7 Claims
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1. An idle engine speed control apparatus for a multiple cylinder engine, comprising:
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a throttle valve disposed in each intake manihold branch upstream of each cylinder of the engine; means defining an air passage connected with each intake manifold branch downstream of said throttle valve; an idle control valve disposed in each air passage, an opening state of said control valve being changeable to control an amount of air flowing in said air passage; means setting a target value of an idle engine speed; means for detecting a crankangle of the engine; means for calculating an engine speed in a combustion stroke of each cylinder of the engine in accordance with said detected crankangle; and means for feedback-controlling the opening state of said idle control valve so that the calculated engine speed is brought into agreement with said target value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An internal combustion engine having multiple cylinders, comprising:
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an intake manifold divided into branches which are connected to the cylinders, respectively; a throttle valve disposed in said each intake manifold branch, an idle control valve arranged to each throttle valve, said idle control valve changing an engine speed (engine torque) of each cylinder by changing its state; means setting a target value of an idle engine speed; means for calculating an engine speed in a combustion stroke time of each cylinder; and means for controlling said idle control valve, which changes an opening state of said idle control valve so that a signal from said engine speed calculating means is adjusted to a signal from said target value setting means.
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Specification