Variably operated valve system for multi-cylinder internal combustion engine and control apparatus for variably operated valve system

Patent metadata

Field	Value
Publication number	US-9181822-B2
Application number	US-201314132310-A
Country	US
Kind code	B2
Filing date	Dec 18, 2013
Priority date	Jan 21, 2013
Publication date	Nov 10, 2015
Grant date	Nov 10, 2015

Abstract

In a variably operated valve system for a multi-cylinder internal combustion engine and a control apparatus for the variably operated valve system, a first valve stop mechanism is configured to switch between a valve operation state in which one of a pair of intake valves from among the pair of intake valves of a part of a plurality of cylinders is operated to be open or closed and a valve stopped state in which the valve open or closure operation of the one of the intake valves is stopped, a second valve stop mechanism is configured to switch between the valve operation state in which the other of the pair of intake valves from among the pair of intake valves of the part of the cylinders is operated to be open or closed and the valve stopped state in which the valve open or closure operation is stopped.

First claim

What is claimed is:

1. A variably operated valve system for a multi-cylinder internal combustion engine, the internal combustion engine having a plurality of cylinders, comprising:
a pair of intake valves and a pair of or a single exhaust valve disposed for each of the cylinders;
a first valve stop mechanism configured to switch between a valve operation state in which one of the pair of intake valves from among the pair of intake valves of a part of the cylinders is operated to be open or closed and a valve stopped state in which a valve open-or-closure operation of the one of the pair of intake valves is stopped; and
a second valve stop mechanism configured to switch between a valve operation state in which the other of the pair of intake valves from among the pair of intake valves of the part of the cylinders is operated to be open or closed and the valve stopped state in which the valve open-or-closure operation is stopped,
wherein the first valve stop mechanism is configured to be in the valve operation state when a switching energy is supplied and to be in the valve stopped state when a supply of the switching energy is stopped and the second valve stop mechanism is configured to be in the valve stopped state when the switching energy is supplied and to be in the valve operation state when the supply of the switching energy is stopped,
wherein, during a start of the engine, the supply of the switching energy to the first valve stop mechanism and the second valve stop mechanism is stopped.

2. A variably operated valve system for a multi-cylinder internal combustion engine, the internal combustion engine having a plurality of cylinders, comprising:
a pair of intake valves and a pair of or a single exhaust valve disposed for each of the cylinders;
swing arms configured to swing with lash adjusters as swing fulcrums to actuate the pair of intake valves and the pair of or single exhaust valve to perform open-or-closure operations;
a first valve stop mechanism actuated by a hydraulic pressure to make a swing quantity of one of the swing arms corresponding to one of the pair of intake valves of a part of the cylinders from among the plurality of cylinders a lost motion to be in a valve stopped state; and
a second valve stop mechanism actuated by the hydraulic pressure to make a swing quantity of another of the swing arms corresponding to the other of the pair of intake valves of the part of the cylinders from among the plurality of cylinders the lost motion to be in the valve stopped state,
wherein the first valve stop mechanism is configured to be in a valve operation state when a hydraulic pressure is supplied and to be in the valve stopped state when a supply of the hydraulic pressure is limited and the second valve stop mechanism is configured to be in the valve stopped state when the hydraulic pressure is supplied and to be in the valve operation state when the supply of the hydraulic pressure is limited,
wherein, during a start of the engine, a supply of the switching energy to the first valve stop mechanism and the second valve stop mechanism is stopped.

3. A control apparatus of a variably operated valve system for a multi-cylinder internal combustion engine, comprising:
a pair of intake valves and a pair of or a single exhaust valve respectively disposed for each of a plurality of cylinders;
a first valve stop mechanism configured to switch between a valve operation state in which one of the pair of intake valves from among the pair of intake valves of a part of the cylinders is operated to be open or closed and a valve stopped state in which a valve open-or-closure operation is stopped; and
a second valve stop mechanism configured to switch between the valve operation state in which the other of the pair of intake valves from among the pair of intake valves of the part of the cylinders is operated to be open or closed and the valve stopped state in which the valve open-or-closure operation of the other of the pair of intake valves is stopped,
wherein the first valve stop mechanism is configured to operate the one of the pair of intake valves when a switching energy is supplied and to stop the valve open-or-closure operation of the one of the pair of intake valves when a supply of a switching energy is carried out, the second valve stop mechanism is configured to stop the operation of the other of the pair of intake valves when the supply of the switching energy is stopped, and the supply of the switching energy to the first valve stop mechanism and to the second valve stop mechanism is separately controlled,
wherein, during a start of the engine, the supply of the switching energy to the first value stop mechanism and the second valve stop mechanism is stopped.

4. The variably operated valve system for the multi-cylinder internal combustion engine as claimed in claim 1 , wherein the pair of exhaust valves is disposed for each of the cylinders, the variably operated valve system further comprises: a third valve stop mechanism configured to switch between a valve operation state in which the pair of exhaust valves of the part of the cylinders are operated to be open or closed and a valve stopped state in which the open-or-closure operation of the pair of exhaust valves is stopped, the third valve stop mechanism is configured to be in the valve stopped state when the switching energy is supplied and to be in the valve operation state when the supply of the switching energy is stopped, and the third valve stop mechanism is configured to cause the pair of exhaust valves of the part of the cylinders to be in the valve stopped state when the second valve stop mechanism causes the other of the pair of intake valves of the part of the cylinders to be in the valve stopped state.

5. The variably operated valve system for the multi-cylinder internal combustion engine as claimed in claim 4 , wherein the first valve stop mechanism switches the one of the pair of the intake valves between the valve operation state and the valve stopped state for all of the cylinders.

6. The variably operated valve system for the multi-cylinder engine as claimed in claim 5 , wherein the variably operated valve system further comprises:
an all cylinders drive one intake valve operation region in which the supply of the switching energy to the first valve stop mechanism, the second valve stop mechanism, and the third valve stop mechanism is stopped;
a reduced cylinder drive one intake valve operation region in which the supply of the switching energy to the first valve stop mechanism is stopped and the supply of the switching energy to the second valve stop mechanism and to the third valve stop mechanism is carried out; and
an all cylinders drive both intake valve operation region in which the switching energy to the first valve stop mechanism is supplied and the supply of the switching energy to the second valve stop mechanism and to the third valve stop mechanism is stopped.

7. The variably operated valve system for the multi-cylinder engine as claimed in claim 4 , wherein the variably operated valve system further comprises a fourth valve stop mechanism disposed to switch one of the pair of intake valves of a remaining cylinder except the part of the plurality of cylinders between the valve operation state and the valve stopped state and the fourth valve stop mechanism is configured to cause the one of the pair of intake valves to be in the valve operation state when the switching energy is supplied and to cause the one of the pair of intake valves to be in the valve stopped state when the supply of the switching energy is stopped.

8. The variably operated valve system for the multi-cylinder engine as claimed in claim 7 , wherein the variably operated valve system further c

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Nakamura Makoto

Classifications

• F01L2305/00

  Valve arrangements comprising rollers · CPC title

• F01L1/2405

  by means of a hydraulic adjusting device located between the cylinder head and rocker arm · CPC title

• F01L1/185

  Overhead end-pivot rocking arms · CPC title

• F02D13/0257

  Independent control of two or more intake or exhaust valves respectively, i.e. one of two intake valves remains closed or is opened partially while the other is fully opened · CPC title

• F01L13/0063

  by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot · CPC title