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US 9,909,519 B2Granted
Internal combustion engine system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiromichi Yasuda
Life of this patent
Estimating the term…
Abstract
An internal combustion engine system includes: an in-cylinder pressure sensor; a crank angle sensor; and a seal portion that seals a space between an outer face of a housing and a wall surface of a cylinder head. A slope that is a ratio of the amount of decrease in a heat release amount relative to the amount of increase in a crank angle is calculated in a period during an expansion stroke from a combustion end point until an opening timing of an exhaust valve. The existence or nonexistence of an abnormality in the sealing function of the seal portion is determined based on whether or not a ratio of the amount of decrease in the slope to the amount of increase in an engine speed is greater than a threshold value.
Claims5
An internal combustion engine system, comprising:
- an in-cylinder pressure sensor that includes:
- a housing that is formed into a cylindrical shape;
- a pressure receiving member that is provided at one end of the housing and configured to receive an in-cylinder pressure, the in-cylinder pressure being a pressure of a gas inside a combustion chamber;
- and a pressure detecting element that is arranged inside the housing and into which a compressive load that is based on the in-cylinder pressure configured to be input from the pressure receiving member, the pressure detecting element being configured to emit an output in accordance with the input compressive load;
- a crank angle sensor configured to detect a crank angle;
- a seal portion configured to, at a position that is further on the combustion chamber side than the pressure detecting element in an axial direction of the housing, seal a space between an outer face of the housing and a wall surface of the combustion chamber that surrounds the housing;
- and
- a controller, the controller programmed to:
- calculate a heat release amount in a cylinder that is an amount of heat released by combustion, based on in-cylinder pressure data that is data regarding an in-cylinder pressure that is detected by the in-cylinder pressure sensor;
- calculate a first ratio that is a ratio of an amount of decrease in a heat release amount relative to an amount of increase in a crank angle in a period during an expansion stroke from an crank angle at which a calculated heat release amount exhibits a maximum value until an opening timing of an exhaust valve;
- and
- determine existence or nonexistence of an abnormality in a sealing function of the seal portion based on the first ratio and an engine speed,
- wherein, when a second ratio that is a ratio of an amount of decrease in the first ratio relative to an amount of increase in an engine speed is greater than a first threshold value, the controller determines that the sealing function of the seal portion is abnormal,
- wherein the controller calculates a mass fraction burned and calculates an ignition delay period using a spark timing and a calculated mass fraction burned,
- wherein the controller corrects a calculated ignition delay period in accordance with a size of the second ratio, and
- wherein the controller adjusts at least one of a fuel injection amount, an intake air amount and an ignition energy to eliminate a difference between a calculated ignition delay period and a target value of the ignition delay period.
13 more elements
An internal combustion engine system, comprising:
- an in-cylinder pressure sensor that includes:
- a housing that is formed into a cylindrical shape;
- a pressure receiving member that is provided at one end of the housing and configured to receive an in-cylinder pressure, the in-cylinder pressure being a pressure of a gas inside a combustion chamber;
- and a pressure detecting element that is arranged inside the housing and into which a compressive load that is based on the in-cylinder pressure configured to be input from the pressure receiving member, the pressure detecting element being configured to emit an output in accordance with the input compressive load;
- a crank angle sensor configured to detect a crank angle;
- a seal portion configured to, at a position that is further on the combustion chamber side than the pressure detecting element in an axial direction of the housing, seal a space between an outer face of the housing and a wall surface of the combustion chamber that surrounds the housing;
- and
- a controller, the controller programmed to:
- calculate a heat release amount in a cylinder that is an amount of heat released by combustion, based on in-cylinder pressure data that is data regarding an in-cylinder pressure that is detected by the in-cylinder pressure sensor;
- calculate a first ratio that is a ratio of an amount of decrease in a heat release amount relative to an amount of increase in a crank angle in a period during an expansion stroke from an crank angle at which a calculated heat release amount exhibits a maximum value until an opening timing of an exhaust valve;
- and
- determine existence or nonexistence of an abnormality in a sealing function of the seal portion based on the first ratio and an engine speed,
- wherein, when a second ratio that is a ratio of an amount of decrease in the first ratio relative to an amount of increase in an engine speed is greater than a first threshold value, the controller determines that the sealing function of the seal portion is abnormal,
- wherein the controller calculates a mass fraction burned and calculates a combustion center based on a calculated mass fraction burned,
- wherein the controller corrects a calculated combustion center in accordance with a size of the second ratio, and
- wherein the controller adjusts a spark timing to eliminate a difference between a calculated combustion center and a target combustion center.
13 more elements
An internal combustion engine system, comprising:
- an in-cylinder pressure sensor that includes:
- a housing that is formed into a cylindrical shape;
- a pressure receiving member that is provided at one end of the housing and configured to receive an in-cylinder pressure, the in-cylinder pressure being a pressure of a gas inside a combustion chamber;
- and a pressure detecting element that is arranged inside the housing and into which a compressive load that is based on the in-cylinder pressure configured to be input from the pressure receiving member, the pressure detecting element being configured to emit an output in accordance with the input compressive load;
- a crank angle sensor configured to detect a crank angle;
- a seal portion configured to, at a position that is further on the combustion chamber side than the pressure detecting element in an axial direction of the housing, seal a space between an outer face of the housing and a wall surface of the combustion chamber that surrounds the housing;
- and
- a controller, the controller programmed to:
- calculate a heat release amount in a cylinder that is an amount of heat released by combustion, based on in-cylinder pressure data that is data regarding an in-cylinder pressure that is detected by the in-cylinder pressure sensor;
- calculate a first ratio that is a ratio of an amount of decrease in a heat release amount relative to an amount of increase in a crank angle in a period during an expansion stroke from an crank angle at which a calculated heat release amount exhibits a maximum value until an opening timing of an exhaust valve;
- and
- determine existence or nonexistence of an abnormality in a sealing function of the seal portion based on the first ratio and an engine speed,
- wherein when the first ratio is greater than a second threshold value that corresponds to an engine speed in a cycle in which in-cylinder pressure data that serves as a basis for calculation of the first ratio is acquired, the controller determines that the sealing function of the seal portion is abnormal,
- wherein the second threshold value is set so as to become smaller when the engine speed is high in comparison to when the engine speed is low,
- wherein the controller calculates a mass fraction burned and calculates an ignition delay period using a spark timing and a calculated mass fraction burned,
- wherein the controller corrects a calculated ignition delay period in accordance with a size of the first ratio, and
- wherein the controller adjusts at least one of a fuel injection amount, an intake air amount and an ignition energy to eliminate a difference between a calculated ignition delay period and a target value of the ignition delay period.
14 more elements
An internal combustion engine system, comprising:
- an in-cylinder pressure sensor that includes:
- a housing that is formed into a cylindrical shape;
- a pressure receiving member that is provided at one end of the housing and configured to receive an in-cylinder pressure, the in-cylinder pressure being a pressure of a gas inside a combustion chamber;
- and a pressure detecting element that is arranged inside the housing and into which a compressive load that is based on the in-cylinder pressure configured to be input from the pressure receiving member, the pressure detecting element being configured to emit an output in accordance with the input compressive load;
- a crank angle sensor configured to detect a crank angle;
- a seal portion configured to, at a position that is further on the combustion chamber side than the pressure detecting element in an axial direction of the housing, seal a space between an outer face of the housing and a wall surface of the combustion chamber that surrounds the housing;
- and
- a controller, the controller programmed to:
- calculate a heat release amount in a cylinder that is an amount of heat released by combustion, based on in-cylinder pressure data that is data regarding an in-cylinder pressure that is detected by the in-cylinder pressure sensor;
- calculate a first ratio that is a ratio of an amount of decrease in a heat release amount relative to an amount of increase in a crank angle in a period during an expansion stroke from an crank angle at which a calculated heat release amount exhibits a maximum value until an opening timing of an exhaust valve;
- and
- determine existence or nonexistence of an abnormality in a sealing function of the seal portion based on the first ratio and an engine speed,
- wherein when the first ratio is greater than a second threshold value that corresponds to an engine speed in a cycle in which in-cylinder pressure data that serves as a basis for calculation of the first ratio is acquired, the controller determines that the sealing function of the seal portion is abnormal,
- wherein the second threshold value is set so as to become smaller when the engine speed is high in comparison to when the engine speed is low,
- wherein the controller calculates a mass fraction burned and calculates a combustion center based on a calculated mass fraction burned,
- wherein the controller corrects a calculated combustion center in accordance with a size of the first ratio, and
- wherein the controller adjusts a spark timing to eliminate a difference between a calculated combustion center and a target combustion center.
14 more elements
Dependencies are inferred from the claim text.