Toyota Jidosha Kabushiki Kaisha

Naoya Okubo

Tomoyuki Tsuji

Akihiro Katayama

Harufumi Muto

Yosuke Hashimoto

Hiroyuki Mizuno

Shinya Ohori

Yukio Kobayashi

Kazuchika Tashima

Seiji Hino

Kazuhiro Hasegawa

Tomonori Satoh

A diagnosis device is intended for an internal combustion engine including a supercharger, a blow-by gas passage that communicates between a portion of an intake passage and a crankcase, a PCV pressure sensor that detects a PCV pressure in the blow-by gas passage, and a crankshaft. The device executes specifying a specific period for which the amount of fluctuations in the intake air amount per unit time is a prescribed value or more on condition that the intake air amount is a determination air amount or more, calculating the amount of fluctuations in the PCV pressure during the specific period, and determining, based on the amount of fluctuations in the PCV pressure, the presence of an abnormality in the blow-by gas passage. The device sets the determination air amount to a smaller value when the rotational speed of the crankshaft is high than when the rotational speed is low.

Internal combustion engine abnormality diagnosis device

An internal combustion engine includes a forced-induction device, a blow-by gas passage, and a PCV pressure sensor detecting a pressure in the blow-by gas passage as a PCV pressure. A period during which an intake fluctuation amount, which is a fluctuation amount of an intake air amount per unit time, is greater than or equal to a specified value is defined as a specific period. The diagnosing apparatus executes a process of calculating a pressure fluctuation amount, which is a fluctuation amount of the PCV pressure in the specific period, a process of correcting the pressure fluctuation amount to a smaller value when the intake air fluctuation amount in the specific period is relatively large than when the intake air fluctuation amount is relatively small, and a process of determining, based on the corrected pressure fluctuation amount, whether there is an anomaly in the blow-by gas passage.

Anomaly diagnosing apparatus and anomaly diagnosing method for vehicle on-board internal combustion engine

An anomaly diagnostic device for an onboard internal combustion engine includes a parameter deriving unit and a leaking anomaly diagnostic unit. The parameter deriving unit is configured to derive a determination parameter such that, when a PCV pressure sensor value that indicates a pressure detected by a PCV pressure sensor is less than an atmospheric pressure, a value of the determination parameter increases as the difference between the PCV pressure sensor value and the atmospheric pressure increases. The leaking anomaly diagnostic unit is configured to perform a leaking anomaly diagnostic process that diagnoses that there is an anomaly at a portion of a blow-by gas passage that is closer to an intake passage than to a connection portion of the PCV pressure sensor when the determination parameter derived when an intake air amount changes is less than a threshold.

Anomaly diagnostic device for onboard internal combustion engine

A learned neural network learned in weights using an engine load, an engine speed, and an intake pressure inside the engine intake passage downstream of the throttle valve () as input parameters of the neural network and using leakage of blow-by gas from a blow-by gas feed path () as a truth label is stored. At the time of operation of the vehicle, the learned neural network is used to detect the abnormality of leakage of blow-by gas from the blow-by gas feed path () from the above input parameters.

System for detecting abnormality in blow-by gas feed path in internal combustion engine

During operation of the engine for a time period from a system-on operation to a system-off operation, the vehicle causes the warming-up determination parameter to be subject to addition when an engine is not in a flow path heat release state where an amount of heat released in the supply flow path is expected to be larger than an amount of heat received in the supply flow path, while causing the warming-up determination parameter to be subject to subtraction when the engine is in the flow path heat release state and a duration time of the flow path heat release state is equal to or longer than a first predetermined time period.

Vehicle

A controller for an internal combustion engine is configured to execute: a process of switching the injection mode according to an engine operational state; an anomaly determination process of determining whether there is an anomaly in the injection system that is implementing a single injection mode during implementation of the single injection mode; a provisional determination process of provisionally determining whether there may be an anomaly in the injection system that is implementing the single injection mode during the implementation of the single injection mode; and an idle determination process of, if it is determined that there is an anomaly in the provisional determination process, prohibiting the automatic stop and executing, during an idle operation, the anomaly determination process by implementing an injection mode that uses only the injection system provisionally determined to have an anomaly in the provisional determination process.

Controller and control method for internal combustion engine

A control device for a high pressure fuel pump () for fuel injection () in which values of at least seven parameters of an engine speed, an engine load, a lubrication oil temperature, an amount of fuel supplied to the high pressure fuel pump (), a temperature of intake air fed into the engine, a temperature of fuel discharged from the high pressure fuel pump (), and a vehicle speed are acquired, and a learned neural network learned in weights using acquired values of the seven parameters as input values of the neural network and using as training data the temperature of fuel discharged from the high pressure fuel pump () acquired after a fixed time period from when acquiring the values of the seven parameters is stored, At the time of an engine operation, the temperature of fuel discharged from the high pressure fuel pump () after the fixed time period is estimated by using the learned neural network from the current estimated temperature of fuel discharged from the high pressure fuel pump ().

Control device for high pressure fuel pump for fuel injection

A controller for vehicle is provided. A determining section obtains fuel pressure in a delivery pipe and performs a rationality check for determining whether the obtained fuel pressure is within a normal range. The determining section shifts the normal range toward a high pressure side when a second index value of a vehicle outside temperature is higher than a first index value as compared with when the second index value is not higher than the first index value. The second index value is obtained when the determining section is activated. The first index value is stored in a nonvolatile memory before a main switch is turned off so that power supply is stopped.

Controller and control method for vehicle, and memory medium

A fuel pressure sensor diagnosis device includes an electronic control unit configured to drive a fuel supply device during electric traveling of a hybrid vehicle, to perform determination as to whether an output of a fuel pressure sensor is within a normal range after driving of the fuel supply device is started, and to perform a diagnosis to determine whether a malfunction has occurred in the fuel pressure sensor based on a result of the determination, the normal range being an assumed range of the output of the fuel pressure sensor in a case where the fuel pressure sensor normally functions and the fuel supply pressure is a prescribed upper limit pressure.

Fuel pressure sensor diagnosis device

The present invention provides an abnormality detection device in which the fuel property sensor is disposed in a branch flow path which is such that there is a time where the fuel in the branch flow path drops out therefrom between one start of the internal combustion engine and the next start. An output value of the fuel property sensor generated when the fuel is flowing through the branch flow path is acquired as a first sensor output value. An output value of the fuel property sensor generated when the fuel in the branch flow path drops out therefrom is acquired as a second sensor output value. The first sensor output value and the second sensor output value are used as judgment data to judge whether the fuel property sensor is abnormal.

Abnormality detection device for internal combustion engine

An abnormality diagnosing system for an internal combustion engine including a first fuel injection valve that injects fuel into a cylinder, and a second fuel injection valve that injects fuel into an intake passage is provided which has a control device controls an injection pattern of the first fuel injection valve and the second fuel injection valve. The control device stores engine operating conditions when an abnormality occurs in the engine, and make a return-to-normal determination as to whether the engine returns to a normal operating state when similar operation conditions that are the same as or within predetermined ranges of the stored operating conditions are established. The injection pattern is selected from patterns in which the fuel is injected solely from the first fuel injection valve, solely from the second fuel injection valve, and from both of the first and second fuel injection valves. The control device stores the injection pattern when the abnormality occurs, and makes a return-to-normal determination on condition that the engine is operating in an injection pattern that is the same as the stored injection pattern.

Abnormality diagnosing system for internal combustion engine

A control apparatus for an internal combustion engine includes a first fuel tank where a first fuel containing alcohol is stored; a second fuel tank where a second fuel is stored, wherein a concentration of alcohol in the second fuel is known; an alcohol concentration sensor disposed in a supply passage through which the first and second fuels flow; and a malfunction determination portion. The control apparatus switches a fuel flowing through the supply passage between the first fuel and the second fuel, and controls a fuel injection amount based on a concentration of the alcohol in the first fuel detected by the sensor. The malfunction determination portion determines that the sensor malfunctions, if a value detected by the sensor is outside a predetermined range corresponding to the concentration of the alcohol in the second fuel when the fuel flowing through the supply passage is switched to the second fuel.

Control apparatus and control method for internal combustion engine

A control system for an internal combustion engine includes: a fuel amount detector; a smoothing calculation unit that calculates a smooth output value, which is obtained by smoothing an output value of the fuel amount detector in a temporal direction; a continuous low speed condition detection unit that detects a continuous low speed condition in which the vehicle speed remains in the low speed region continuously beyond a predetermined time period; a calculation processing unit that successively calculates a maximum value and a minimum value of the smooth output value; a reference setting unit that updates and stores a reference value in response to the engine stoppage and in accordance with the current minimum value calculated by the calculation processing unit; and a fuel supply determination unit that detects a fuel supply to the fuel tank during the continuous low speed condition.

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Chiryu, Japan

Naoya Okubo