Control apparatus for compression auto-ignition engine
AssigneeMazda Motor Corporation
InventorsAtsushi Inoue, Masanari Sueoka, Kota Matsumoto, Tomonori Urushihara
Life of this patent
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Abstract
A control apparatus for a compression autoignition engine controls compression autoignition by ignition. The control apparatus includes an injector, a spark plug, and a controller. The controller controls the injector so that fuel is injected by a plurality of divided injections, and thereafter, outputs a control signal to the spark plug at predetermined ignition timing so that, by ignition, unburned air-fuel mixture combusts by autoignition. Control is performed so that, when load on the engine is high, an amount of fuel injected at later timing among the plurality of injections becomes larger than when the load is low.
Claims18
A control apparatus for a compression autoignition engine, which controls compression autoignition by ignition in a combustion chamber, the control apparatus comprising:
- an injector mounted to the compression autoignition engine and configured to inject fuel to be supplied into the combustion chamber;
- a spark plug disposed so as to face an inside of the combustion chamber, and configured to ignite an air-fuel mixture in the combustion chamber;
- and
- a controller connected to the injector and the spark plug and configured to operate the engine by outputting a control signal to the injector and a control signal to the spark plug, wherein
- the controller controls the injector so that the fuel is injected by a plurality of injections, and thereafter, outputs the control signal to the spark plug at a predetermined ignition timing so that, by ignition, an unburned air-fuel mixture in the combustion chamber combusts by autoignition,
- the controller performs control so that, when a load on the engine is high, an amount of fuel injected at a later timing among the plurality of injections becomes larger than when the load is low, and
- the controller is configured to read a change in a pressure in the combustion chamber detected by a pressure sensor, and to set each of the amount of fuel injected in the plurality of injections based on the change in the pressure in the combustion chamber.
A control apparatus for a compression autoignition engine, which controls compression autoignition by ignition in a combustion chamber, the control apparatus comprising:
- an injector mounted to the compression autoignition engine and configured to inject fuel to be supplied into the combustion chamber;
- a spark plug disposed so as to face an inside of the combustion chamber, and configured to ignite air-fuel mixture in the combustion chamber;
- and
- a controller connected to the injector and the spark plug and configured to operate the engine by outputting a control signal to the injector and a control signal to the spark plug, wherein
- the controller controls the injector so that the fuel is injected by a plurality of injections, and thereafter, outputs the control signal to the spark plug at a predetermined ignition timing so that, by ignition, an unburned air-fuel mixture in the combustion chamber combusts by autoignition,
- the controller controls an amount of the fuel injected at later timing among the plurality of injections, to change, in accordance with an operation state of the engine, a heat amount ratio that represents an index associated with a ratio of an amount of heat generated when the air-fuel mixture combusts by flame propagation with respect to a total amount of heat generated when the air-fuel mixture combusts in the combustion chamber, and
- the controller is configured to read a change in a pressure in the combustion chamber detected by a pressure sensor, and to set each of the amount of fuel injected in the plurality of injections based on the change in the pressure in the combustion chamber.
A control apparatus for a compression autoignition engine, which controls compression autoignition by ignition in a combustion chamber, the control apparatus comprising:
- an injector mounted to the compression autoignition engine and configured to inject fuel to be supplied into the combustion chamber;
- a spark plug disposed so as to face an inside of the combustion chamber, and configured to ignite air-fuel mixture in the combustion chamber;
- and
- a controller connected to the injector and the spark plug and configured to operate the engine by outputting a control signal to the injector and a control signal to the spark plug, wherein
- the controller outputs the control signal to the injector so as to perform at least two fuel injections which are an injection in a period from an intake stroke to a former half of a compression stroke and an injection in a period from a latter half of the compression stroke to a former half of an expansion stroke, and
- the controller outputs the control signal to the spark plug at a predetermined timing so that an unburned air-fuel mixture in the combustion chamber undergoes autoignition to combust, by ignition, after the two fuel injections, and
- the controller is configured to read a change in a pressure in the combustion chamber detected by a pressure sensor, and to set each of the amount of fuel injected in the at least two fuel injections based on the change in the pressure in the combustion chamber.
Dependencies are inferred from the claim text.