Internal combustion engine system

Patent metadata

Field	Value
Publication number	US-10329962-B2
Application number	US-201815877437-A
Country	US
Kind code	B2
Filing date	Jan 23, 2018
Priority date	Mar 23, 2017
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

At crank angle CA 10 at which the switch request of the drive cam was issued, the ejection operations of the pins at all the solenoid actuators started simultaneously. The ejected pins are seated on the cam carriers at crank angle CA 12 . The pin seated on the cam carrier moves along the grooves in accordance with the rotation of the cam carrier. The earliest finish timing of the switch operation of the drive cam is at crank angle CA 13 (#4 cylinder). At the crank angle CA 13 , drive of the fuel injector and the ignition device in each cylinder is permitted.

First claim

What is claimed is:

1. An internal combustion engine system comprising:
an internal combustion engine comprising multiple cylinder;
multiple types of cams which have different cam profiles per cylinder and are configured to drive intake valves which are provided in each cylinder;
cam carriers which are provided on a cam shaft which rotates synchronously with a crank shaft of the internal combustion engine, each of the cam carriers supports the multiple types of cams per cylinder or cylinder groups, wherein a spiral-shaped groove is formed on an outer periphery of each of the cam carriers, the spiral-shaped groove comprises an inclined part which inclines with respect to the cam shaft, a front orthogonal part which is orthogonal to the cam shaft and communicates with the inclined part on a front side in the rotation direction of the cam shaft and a rear orthogonal part which is orthogonal to the cam shaft and communicates with the inclined part on a rear side in the rotation direction of the cam shaft;
multiple switching mechanisms which are provided corresponding to the cam carriers and are configured to:
slide the cam carriers sequentially in the axial direction of the cam shaft in accordance with ejection operations of pins which are configured to engage with the spiral-shaped groove; and
switch drive cams that actually drive the intake valves among the multiple types of the cams; and
a control device,
wherein the control device is configured to:
when operating the switching mechanisms during non-engine start, execute a cylinder discrimination based on information about rotation positions of the crank shaft and the cam shaft and determine start timing of ejection operations of the pins based on the result of the cylinder discrimination; and
when operating the switching mechanisms during engine start, start to perform the ejection operations of the pins so that at least one of the pins is ejected from at least one of the switching mechanisms before the execution of the cylinder discrimination.

2. The internal combustion engine system according to claim 1 ,
wherein the control device is also configured to, when operating the switching mechanisms during the engine start, permit combustion in all cylinders or cylinder groups when a retraction operation of at least one of the pins which is ejected from at least one of the switching mechanisms is completed.

3. The internal combustion engine system according to claim 1 ,
wherein the internal combustion engine system further comprising a motor which is configured to rotate the crank shaft during the engine start,
wherein the control device is also configured to:
when operating the switching mechanisms during the engine start, start the ejection operations of the pins in all the switching mechanisms before the execution of the cylinder discrimination; and
drive the motor after the ejected pins from all of the switching mechanisms are seated on the cam carriers.

4. The internal combustion engine system according to claim 3 ,
wherein the control device is also configured to start the ejection operations of the pins in all the switching mechanisms at the same timing.

5. The internal combustion engine system according to claim 1 ,
wherein the control device is also configured to:
sequentially start the ejection operations of the pins for each mechanism group obtained by dividing the switching mechanisms into at least two mechanism groups; and
permit combustion in all cylinders or cylinder groups when the retraction operation of at least one of the pins is completed which was ejected from a switching mechanism belonging to a mechanism group whose order of the ejection operation is the last of the mechanism groups.

6. The internal combustion engine system according to claim 5 ,
wherein the control device is also configured to start the ejection operations of the pins belonging to a second mechanism group after the ejection operations of the pins belonging to a first mechanism group are completed.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kawai Takayoshi
• Adachi Noriyasu
• Sugihira Shigehiro
• Sasaki Keisuke
• Otsuka Kaoru
• Sadakane Shinji
• Sugihara Hiroyuki

Classifications

• F16H53/025

  characterised by their construction, e.g. assembling or manufacturing features · CPC title

• F01L13/0015

  for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque · CPC title

• F01L1/08

  Shape of cams · CPC title

• F02D41/062

  for starting (F02D41/061 takes precedence) · CPC title

• F02D2041/0092

  Synchronisation of the cylinders at engine start · CPC title