Toyota Jidosha Kabushiki Kaisha

Atsushi Nagai

Harufumi Muto

Masakazu Aoki

Satoshi Takamoto

Yosuke Hashimoto

Yohsuke Hashimoto

Kohei Mori

Tatsunobu Murai

Matsuei Ueda

Makoto Nagaoka

Kohichiroh Yonemura

Takato Ikedo

Hitoshi Hosaki

Yuji Matsumura

A CPU calculates probability models by inputting input variables to a neural network. Next, the CPU determines whether a maximum value among the calculated probability models is larger than an upper limit value of a permissible range. When the maximum value is larger than the upper limit value of the permissible range, the CPU calculates a difference between the maximum value and a first reference value within the permissible range, and subtracts the difference from all the probability models. Then, the CPU calculates a probability of misfire in each cylinder by inputting each of the calculated probability models to a softmax function of mapping.

Internal combustion engine condition determination apparatus, internal combustion engine condition determination system, and data analyzing apparatus

A catalyst state estimation apparatus includes a first sensor, a memory and a processor. The first sensor is configured to acquire information about a catalyst that removes a toxic substance in an exhaust gas, the first sensor being provided in a main passage into which the exhaust gas flows from an internal combustion engine. The memory is configured to previously store a catalyst state estimation model that includes at least one mathematical model. The processor is configured to estimate a removal performance of the catalyst by applying the information about the catalyst acquired by the first sensor to the catalyst state estimation model.

Catalyst state estimation apparatus, catalyst state estimation method with information processing apparatus, and non-transitory recording medium in which program is stored

A catalyst temperature estimation device that estimates a temperature of a catalyst provided in an exhaust passage of an internal combustion engine includes a storage device and processing circuitry. The storage device stores mapping data that specifies a mapping that uses multiple input variables to output an estimation value of the temperature of the catalyst. The multiple input variables include at least one variable of an ambient temperature variable or an excess amount variable. The multiple input variables further include a fluid energy variable, which is a state variable related to energy of fluid flowing into the catalyst, and a previous cycle value of the estimation value of the temperature of the catalyst. The processing circuitry is configured to execute an acquisition process, a temperature calculation process, and an operation process. The mapping data includes data that is learned through machine learning.

Catalyst temperature estimation device, catalyst temperature estimation system, data analysis device, and control device of internal combustion engine

An engine start controller includes an injection amount calculating portion that is configured to calculate, as an assist injection amount, an injection amount of fuel injected from a fuel injection valve of an engine in an engine start-up period until the engine rotation speed exceeds a predetermined starting rotation speed from zero. The injection amount calculating portion is configured such that, in a case in which the rotation speed of the engine is higher than or equal to a threshold value that is a value less than the starting rotation speed, the injection amount calculating portion calculates the assist injection amount to be smaller when the engine is started by using the motor generator than when the engine is started by using the starter.

Engine start controller for vehicle

A coolant circulation system includes a coolant circuit including a water jacket, a motor-driven pump, an outlet liquid temperature sensor, and a controller. The controller executes variation determination control for driving the motor-driven pump to determine whether a variation in the temperature of the coolant in a diesel engine is equal to or less than a predetermined value based on an outlet temperature detected by the outlet liquid temperature sensor. The controller executes circulation stop control on condition that it is determined that the variation in the temperature of the coolant is equal to or less than the predetermined value. The controller changes the period during which the circulation stop control is executed in accordance with the outlet liquid temperature detected at the start of the circulation stop control.

Coolant circulation system for vehicle-mounted internal combustion engine

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Toyota, Japan

Atsushi Nagai