An accelerator position detection device includes a handlebar grip that is turnable in a normal rotation direction and in a reverse rotation direction from a neutral position and is energized to the neutral position when no operation is applied; accelerator position sensors that output voltage according to an angle of the handlebar grip and that include a first sensor and a second sensor; and a detector that detects an angle for control for controlling a vehicle on the basis of the angle of the handlebar grip according to output from the accelerator position sensors. The detector detects an angle as a positive value on the basis of a first voltage when the first voltage in a rising range is output, and the detector detects an angle as a negative value on the basis of a second voltage when a first initial value not located in the rising range is output.

A method for controlling an internal combustion engine with a crankshaft position sensor, intake air pressure sensor and fresh air intake throttle valve, includes: determining the engine's rotational speed based on the crankshaft position derivative relative to time; determining the intake air pressure for a first crankshaft position corresponding to 180° before top dead center; determining the intake air pressure for a second crankshaft position corresponding to 390° before top dead center; determining an atmospheric pressure learning pressure threshold based on the engine's rotational speed; determining whether the difference between the intake air pressures for the first and second crankshaft positions is below the atmospheric pressure learning pressure threshold; if so, commanding atmospheric pressure learning by applying a first-order filter to the intake air pressure for the second crankshaft position; and controlling the internal combustion engine as a function of the learned atmospheric pressure value.

An update process updates relationship defining data by inputting, to a predetermined update map, a state of a vehicle obtained by a state obtaining process, a value of an action variable used to operate an electronic device, and a reward corresponding to an operation of an electronic device. A range in which an operation process uses, as the action variable, a value different from a value that maximizes an expected return related to the reward is defined as a return non-maximizing range. In a case in which a degree of deterioration of the vehicle is greater than or equal to a predetermined degree, a changing process changes the return non-maximizing range to a side on which the return non-maximizing range is expanded as compared to a case in which the degree of deterioration is less than the predetermined degree.

An engine control device includes a processor configured to execute a fuel injection control including: a first fuel injection processing for injecting an amount of fuel according to a first intake air amount based on an intake air flow rate detected by an air flow sensor; and a second fuel injection processing for injecting an amount of fuel according to a second intake air amount based on a throttle opening degree detected by a throttle position sensor. The processor selects the first fuel injection processing when a pulsation rate of the intake air flow rate is equal to or lower than a pulsation rate threshold value, and selects the second fuel injection processing when the pulsation rate is higher than the pulsation rate threshold value. The pulsation rate threshold value is smaller when a temperature correlation value is low than when the temperature correlation value is high.

A method and system for controlling operation of a two-stroke engine having a turbocharger includes the two-stroke engine comprising an electronically controlled exhaust valve. A throttle position sensor generates a throttle position signal corresponding to a position of a throttle plate of a throttle. A boost box is coupled to the two-stroke engine. A boost box pressure sensor is coupled to the boost box and generates a boost box pressure signal corresponding to a pressure within the boost box. A controller is coupled to the boost box pressure signal controlling a position of the electronically controlled exhaust valve in response to the boost box pressure signal and the throttle position signal.

An engine device is equipped with an engine, a supercharger having a turbine, a compressor and a waste gate valve, and a control device that controls the engine and the supercharger, and that performs an abnormality diagnosis of a relationship between an intake air amount of the engine and a supercharging pressure as a pressure downstream of the compressor in the intake pipe. The control device performs boost control for controlling the waste gate valve such that the supercharging pressure becomes higher when a predetermined condition is fulfilled than when the predetermined condition is not fulfilled. The control device further sets a threshold for use in the abnormality diagnosis, based on whether or not the boost control is performed.

A system and method for an electronic control unit adapter used to supplement existing electronic control units for enhanced or additional IO integration, the electronic control unit adapter designed to be updated easily by the end user in order to add functionality as it is developed thus prolonging the viability of an electronic control unit or vehicle, the electronic control unit adapter usable in conjunction with a vehicle or other vessel using an internal combustion engine or similar technology.

A vehicle controller includes processing circuitry and a storage device. The storage device stores relationship specifying data that specifies a relationship between a state of a vehicle and at least one action variable. The at least one action variable is a variable related to operation of an operating unit of an internal combustion engine. The processing circuitry is configured to execute an obtaining process that obtains a state of the vehicle, an operating process that operates the operating unit based on a value of the at least one action variable, a reward calculation process, an updating process that updates the relationship specifying data, and a determination process that determines whether the internal combustion engine has deteriorated. The determination process is executed on condition that at least one of the at least one action variable equals a predetermined value.

A system and method of controlling a turbocharged engine system includes receiving a boost mode selection signal and controlling the turbocharged engine system in response to the boost mode selection signal.

Systems and methods for operating an engine and controlling engine parameters over a range of ambient temperature conditions are provided. A method for an engine includes selecting one or more of an engine speed, an engine load, a base timing, and a fuel common rail pressure from a pre-calibrated engine map corresponding to a selected throttle level and modifying the one or more of the engine speed, the engine load, the base timing, and the fuel common rail pressure based on sensed environmental conditions.