公开(公告)号：US20170335725A1

公开(公告)日：2017-11-23

申请号：US15533083

申请日：2016-01-14

Applicant: MAZDA MOTOR CORPORATION

Inventor： Tomomi WATANABE ,  Nobuyuki FURUICHI ,  Sho SHIMAMOTO ,  Mikinori OHASHI ,  Shigeyuki HIRASHITA

IPC: F01L1/344 ,  F02D19/08 ,  F02D41/06

CPC classification number: F01L1/3442 ,  F02D13/02 ,  F02D19/08 ,  F02D19/084 ,  F02D41/064 ,  F02D41/065

Abstract: In a flexible-fuel engine capable of using fuel containing alcohol as fuel to be combusted in a cylinder, the geometric compression ratio is set to 12 or more, the engine is started by using fuel containing alcohol, an intake valve closing timing at an engine start time is set to an advance angle side than a first reference timing being a timing corresponding to a most retarded angle position out of intake valve closing timings capable of starting the engine in combusting fuel of alcohol 100% in the cylinder at a first intake temperature, and is set to a timing on a retarded angle side than a second reference timing being a timing corresponding to a most advanced angle position out of intake valve closing timings capable of avoiding pre-ignition in combusting fuel of gasoline 100% at an engine start time at a second intake temperature.

公开(公告)号：US20150337751A1

公开(公告)日：2015-11-26

申请号：US14655704

申请日：2014-01-15

Applicant: MAZDA MOTOR CORPORATION

Inventor： Tomomi WATANABE ,  Shigeyuki HIRASHITA ,  Naoki KISHIKAWA ,  Keiji ARAKI

IPC: F02D41/02 ,  F02D41/06 ,  F02D43/04 ,  F01N9/00 ,  F02D13/02

CPC classification number: F02D41/0255 ,  F01N3/2006 ,  F01N9/00 ,  F01N2430/08 ,  F01N2900/1626 ,  F02B23/104 ,  F02D13/02 ,  F02D37/02 ,  F02D41/0002 ,  F02D41/0245 ,  F02D41/064 ,  F02D43/04 ,  F02D2041/001 ,  F02P5/1502 ,  F02P5/1506 ,  Y02T10/18 ,  Y02T10/26 ,  Y02T10/42 ,  Y02T10/46

Abstract: When a catalytic converter in an exhaust passage is in an un-activated state, an intake air amount is increased, as compared to when the converter is in an activated state under the same engine operation condition, and an ignition timing is retarded beyond a TDC of a compression stroke. The ignition timing is set such that a retard amount thereof from the TDC becomes larger as an external load causing a rotational resistance of an engine becomes lower. A valve opening start timing of an exhaust valve is set such that, when the external load is lower than a given reference load, the valve starts opening, before an in-cylinder pressure reaches a peak, according to combustion of an air-fuel mixture ignited at the above ignition timing, in a subsequent expansion stroke, wherein the in-cylinder pressure is based on an assumption that the valve is maintained in a valve-closed state.

Abstract translation: 当排气通道中的催化转化器处于未激活状态时，与在相同发动机运行状态下转换器处于激活状态相比，进气量增加，点火正时延迟超过TDC 的压缩冲程。 点火正时被设定为使得随着引起发动机的转动阻力的外部负载变低，来自TDC的延迟量变大。 设定排气门的开阀开始正时，使得当外部负荷低于给定的基准负荷时，根据空气 - 燃料混合物的燃烧，在缸内压力达到峰值之前，阀开始打开 在随后的膨胀冲程中在上述点火正时被点燃，其中缸内压力基于阀维持在阀关闭状态的假设。