Internal combustion engine system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsTakayoshi Kawai, Noriyasu Adachi, Shigehiro Sugihira, Keisuke Sasaki, Kaoru Otsuka, Shinji Sadakane, Hiroyuki Sugihara
Life of this patent
Estimating the term…
Abstract
At crank angle CA10 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 CA12. 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 CA13 (#4 cylinder). At the crank angle CA13, drive of the fuel injector and the ignition device in each cylinder is permitted.
Claims6
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.
Dependencies are inferred from the claim text.