Control apparatus

a control apparatus and control technology, applied in the direction of adaptive control, electric control, instruments, etc., can solve the problems of low control accuracy, low control resolution, and high friction of the above-mentioned hydraulically-driven variable cam phase mechanism as a controlled object, and achieve high levels of control resolution and control accuracy

a control apparatus and control technology, applied in the direction of adaptive control, electric control, instruments, etc., can solve the problems of low control accuracy, low control resolution, and high friction of the above-mentioned hydraulically-driven variable cam phase mechanism as a controlled object, and achieve high levels of control resolution and control accuracy

US20060266316A1Inactive Publication Date: 2006-11-30HONDA MOTOR CO LTD
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first embodiment

[0053] Hereafter, a control apparatus for an internal combustion engine, according the present invention, will be described with reference to the drawings. As shown in FIG. 2, the control apparatus 1 includes an ECU 2. As described hereinafter, the ECU 2 carries out various control processes for controlling a cam phase, a valve lift, etc., depending on operating conditions of an internal combustion engine (hereinafter simply referred to as “the engine”) 3.

[0054] Referring to FIGS. 1 and 3, the engine 3 is an in-line four-cylinder gasoline engine having a four pairs of cylinders 3a and pistons 3b (only one pair of which is shown), and installed on a vehicle, not shown. The engine 3 includes an intake valve 4 and an exhaust valve 7 provided for each cylinder 3a, for opening and closing an intake port and an exhaust port thereof, respectively, an intake camshaft 5 and intake cams 6 for actuating the intake valves 4, a variable intake valve-actuating mechanism 40 that actuates the intak...

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Abstract

A control apparatus that is capable of maintaining both the control resolution and the control accuracy at respective high levels even when at least one of the nonlinearity and the frequency characteristic of a controlled object varies. A control apparatus 1 that control a cam phase Cain by a phase control input Ucain includes two controllers 102 and 103. The two-degree-of-freedom response-specifying controller 102 calculates a follow-up control input Rsld as a value for causing the cam phase to follow a target cam phase Cain_camd. The DSM controller 103 calculates a phase control input Ucain by modulating the follow-up control input Rsld, and in the calculation, the repetition period at which the phase control input Ucain is calculated is selected from two repetition periods ΔT1 and ΔT2 according to engine speed NE, a cam phase Cain, and a valve lift Liftin.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a control apparatus that controls a controlled object which varies in nonlinearities, such as hysteresis and dead time, and frequency characteristic. [0003] 2. Description of the Related Art [0004] Conventionally, there has been proposed a control apparatus that controls a variable cam phase mechanism as in Japanese Laid-Open Patent Publication (Kokai) No. 2001-132482. The variable cam phase mechanism varies the phase of an intake camshaft relative to a crankshaft of an internal combustion engine (hereinafter referred to as “the cam phase”) as desired, and is hydraulically driven by oil pressure supplied from an oil pump. Further, the control apparatus includes a crank angle sensor and a cam angle sensor that detect respective signals corresponding to angular positions of the crankshaft and the intake camshaft, and a controller to which the detection signals from the sensors are inpu...

Claims

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Application Information

Patent Timeline
30 Nov 2006
Publication
US20060266316A1
IPC
F01L1/34
CPC
F01L1/34; F01L1/3442; F01L13/0021; F01L2800/00; F02D13/0211; Y02T10/18; F02D41/0002; F02D41/1401
Inventors
YASUI, YUJI