Combustion abnormality monitoring device for two-stroke engine
A combustion abnormality monitoring device for a two-stroke engine includes: a detection unit configured to detect combustion abnormality that is in-cylinder combustion triggered at a timing different from the timing of ignition; and a control unit configured to control the condition inside the cylinder when the detection unit detects combustion abnormality.
1 . A combustion abnormality monitoring device for a two-stroke engine, the two-stroke engine including a cylinder, a piston, a scavenging port on an inner peripheral surface of the cylinder and communicating with a crank chamber, and an exhaust port on the inner peripheral surface of the cylinder and communicating with an exhaust pipe, the scavenging port to be opened and closed by a reciprocating motion of the piston, the combustion abnormality monitoring device comprising:
a detection unit configured to detect a combustion abnormality in a form of in-cylinder combustion triggered at a timing different from a timing of ignition; and
a control unit configured to control a condition inside the cylinder when the detection unit detects the combustion abnormality so as to reduce a frequency at which the combustion abnormality occurs by controlling an exhaust device to adjust an amount of opening of the exhaust port.
2 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , further comprising a storage unit configured to store history information of an occurrence of past combustion abnormalities when the detection unit has detected any combustion abnormality in the past,
wherein the control unit is further configured to control the condition inside the cylinder based on the history information of the occurrence of past combustion abnormalities, the history information being stored in the storage unit.
3 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the control unit is further configured to control the condition inside the cylinder depending on a number of occurrences of the combustion abnormality, or on a scale of the combustion abnormality detected by the detection unit.
4 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the control unit is further configured to control the condition inside the cylinder by, in addition to controlling the exhaust device to adjust the amount of opening of the exhaust port, changing at least one of a condition for injecting fuel, and a condition of ignition.
5 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the control unit is further configured to control the condition inside the cylinder to a condition for eliminating the combustion abnormality.
6 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , further comprising a storage unit configured to store a detection result of the combustion abnormality detected by the detection unit, and to store a control parameter for eliminating the combustion abnormality, the control parameter including information relating to the amount of opening of the exhaust port,
wherein the control unit is further configured to control the condition inside the cylinder by controlling the engine using the control parameter stored in the storage unit.
7 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the detection unit is further configured to detect the combustion abnormality based on a change in pressure inside the cylinder or a change in a vibration of the engine.
8 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the detection unit is further configured to detect the combustion abnormality based on an engine drive region.
9 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the control unit is further configured to control the condition inside the cylinder by, in addition to controlling the exhaust device to adjust the amount of opening of the exhaust port, performing at least one of increasing or decreasing an amount or frequency by or at which fuel is injected, and delaying a timing of ignition.
10 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the control unit is further configured to control the condition inside the cylinder to reduce a frequency at which the combustion abnormality occurs, by adjusting the amount of opening and a timing for opening the exhaust port.
11 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the control unit is further configured to control the condition inside the cylinder by controlling the exhaust device based on a degree of throttle opening and an engine rotation speed.
12 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , wherein the control unit is further configured to control the condition inside the cylinder by changing a condition for injecting fuel, in addition to changing a condition of intake and exhaust by the exhaust device.
13 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , further comprising a storage unit configured to store history information of an occurrence of a combustion abnormality when the detection unit detects the combustion abnormality,
wherein the control unit is further configured to control the condition inside the cylinder based on the history information of the occurrence of the combustion abnormality, the history information being stored in the storage unit, and
wherein the history information of the occurrence of the combustion abnormality includes information related to a relationship between an engine rotation speed and the combustion abnormality of the engine.
14 . The combustion abnormality monitoring device for a two-stroke engine according to claim 1 , further comprising a storage unit configured to store history information of an occurrence of a combustion abnormality when the detection unit detects the combustion abnormality,
wherein the control unit is further configured to control the condition inside the cylinder based on the history information of the occurrence of the combustion abnormality, the history information being stored in the storage unit, and
the history information of the occurrence includes information related to a relationship between an engine rotation speed, a throttle opening, and the combustion abnormality of the engine.
15 . A combustion abnormality monitoring device for a two-stroke engine, the two-stroke engine including a cylinder, a piston, a scavenging port on an inner peripheral surface of the cylinder and communicating with a crank chamber, and an exhaust port on the inner peripheral surface of the cylinder and communicating with an exhaust pipe, the scavenging port to be opened and closed by a reciprocating motion of the piston, the combustion abnormality monitoring device comprising:
a detection unit configured to detect a combustion abnormality in a form of in-cylinder combustion triggered at a timing different from a timing of ignition;
a storage unit configured to store a detection result of the combustion abnormality detected by the detection unit; and
a transmission unit configured to transmit to an external device the detection result of the combustion abnormality stored in the storage unit,
wherein the detection result includes information related to a relationship between an engine rotation speed, a throttle opening, and the combustion abnormality of the two-stroke engine.
16 . The combustion abnormality monitoring device for a two-stroke engine according to claim 15 , wherein the storage unit is configured to store the detection result of the combustion abnormality detected by the detection unit, in association with an engine drive region.
17 . The combustion abnormality monitoring device for a two-stroke engine according to claim 15 , wherein:
the storage unit is further configured to store a control parameter for eliminating the combustion abnormality, the control parameter corresponding to the combustion abnormality, and
the transmission unit is further configured to transmit the control parameter for eliminating the combustion abnormality to an external device, the control parameter corresponding to the detection result of the combustion abnormality, the detection result being stored in the storage unit.
18 . The combustion abnormality monitoring device for a two-stroke engine according to claim 15 , wherein:
the storage unit is further configured to store information used in maintenance of an engine component, the information corresponding to the combustion abnormality, and
the transmission unit is further configured to transmit the information used in the maintenance of the engine component to the external device, the information corresponding to the detection result of the combustion abnormality, the detection result being stored in the storage unit.
19 . A combustion abnormality monitoring device for a two-stroke engine, the two-stroke engine including a cylinder, a piston, a scavenging port on an inner peripheral surface of the cylinder and communicating with a crank chamber, and an exhaust port on the inner peripheral surface of the cylinder and communicating with an exhaust pipe, the scavenging port to be opened and closed by a reciprocating motion of the piston, the combustion abnormality monitoring device comprising:
a storage unit configured to store big data comprising an accumulation of a plurality of pieces of data related to a relationship between operation information of the two-stroke engine and history information of a failure and maintenance of an engine component, the failure and the maintenance being based on a combustion abnormality in a form of in-cylinder combustion triggered at a timing different from a timing of ignition; and
a prediction unit configured to predict information of the failure and the maintenance of the engine component from the operation information of the two-stroke engine, based on the big data stored in the storage unit,
wherein the operating information of the two-stroke engine includes environmental information of the two-stroke engine and running information of the two-stroke engine.