Valve characteristic control apparatus of internal combustion engine and methods of controlling valve characteristics

a valve characteristic and control apparatus technology, applied in the direction of electric control, machines/engines, output power, etc., can solve the problems of difficult fault diagnosis regarding the valve timing-varying mechanism, inability to simply apply the diagnostic technique employed by the aforementioned apparatus, and difficulty in identifying which mechanism has an abnormality

a valve characteristic and control apparatus technology, applied in the direction of electric control, machines/engines, output power, etc., can solve the problems of difficult fault diagnosis regarding the valve timing-varying mechanism, inability to simply apply the diagnostic technique employed by the aforementioned apparatus, and difficulty in identifying which mechanism has an abnormality

US20010020458A1Inactive Publication Date: 2001-09-13TOYOTA JIDOSHA KK
0 Cites 21 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Valve characteristic control apparatus of internal combustion engine and methods of controlling valve characteristics
  • Valve characteristic control apparatus of internal combustion engine and methods of controlling valve characteristics
  • Valve characteristic control apparatus of internal combustion engine and methods of controlling valve characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

)

[0044] An embodiment in which the valve characteristic control apparatus of an internal combustion engine of the invention is embodied will be described hereinafter with reference to FIGS. 1 to 8.

[0045] FIG. 1 shows an in-line four-cylinder gasoline engine (hereinafter "engine") 11 for installation in a vehicle as an internal combustion engine. The engine 11 has a cylinder block 13 in which reciprocating pistons 12 are provided, an oil pan 13a provided below the cylinder block 13, and a cylinder head 14 provided above the cylinder block 13.

[0046] A crankshaft 15, which is an output shaft of the engine 1 and is rotatably supported in a lower portion of the engine 11. The pistons 12 are connected to the crankshaft 15 via connecting rods 16. Reciprocating movements of the pistons 12 are converted into a rotational movement of the crankshaft 15 by the connecting rods 16. A combustion chamber 17 is formed above each piston 12. The combustion chambers 17 are connected with intake passage...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A camshaft provided with three-dimensional cams is connected at its one end to a valve lift-varying actuator. By the valve lift-varying actuator displacing the camshaft in the directions of an axis of the camshaft, the lift characteristic of intake valves set by the three-dimensional cams is variably controlled to a target amount of valve lift. The valve lift characteristic related to this control is detected as a detected amount of valve lift by a reference-purposed detected portion and a cam angle sensor. An apparatus and a method diagnoses abnormalities in the valve lift-varying actuator by, for example, evaluating whether the amount of change in the detected amount of valve lift is at most a predetermined value and the absolute value of a difference between the detected amount of valve lift and the target amount of valve lift is greater than a predetermined value.

Description

[0001] The disclosure of Japanese Patent Application No. 2000-065449 filed on Mar. 9, 2000 including the specification, drawings and abstract is incorporated herein by reference in its entirety.[0002] 1. Field of Invention[0003] The invention relates to methods and a valve characteristic control apparatus of an internal combustion engine for variably controlling the valve characteristic of an engine valve in accordance with the operation state of the engine.[0004] 2. Description of the Related Art[0005] As a valve characteristic control apparatus, an apparatus described in Japanese Patent Application Laid-Open No. 8-177434, as for example, is known. This apparatus includes a valve lift-varying mechanism that allows variation of the amount of valve lift of an engine valve, and a valve timing-varying mechanism that allows variation of the valve timing. If either one of the varying mechanisms has a fault, the following control is performed. That is, with regard to the valve lift-varyin...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
13 Sep 2001
Publication
US20010020458A1
IPC
F01L1/34; F01L1/46; F01L1/344; F01L13/00; F02D13/02; F02D41/00; F02D41/22
CPC
F01L1/024; F01L1/34406; F01L1/3442; F01L13/0042; F01L2001/0537; F01L2001/34469; F01L2800/00; F01L2800/12
Inventors
MIKAME, KAZUHISA