Engine control method
AssigneeKabushiki Kaisha Toyota Jidoshokki
InventorTakanori Suzuki
Life of this patent
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Abstract
Embodiments of the present invention include an engine control method for controlling an engine having an accessory. In the method, a relationship between a torque of the accessory and a controlled variable corresponding to each rotational speed of the engine is stored in advance. An estimated value of the controlled variable is calculated based on a calculated value of the torque of the accessory and the engine rotational speed by reference to the said relationship. A command value of the controlled variable is calculated based on at least one of the engine rotational speed, opening of a throttle, opening of an accelerator and an air supply pressure. A calculated difference is determined by comparing the estimated value of the controlled variable and the command value of the controlled variable.
Claims10
An engine control method for controlling an engine with an accessory, comprising the steps of:
- establishing a learning condition after a predetermined period from a previous learning has elapsed during a cargo handling operating through using the accessory driven by the engine while a car that travels by the engine is stopped;
- storing in advance, in an electronic control unit including program logic, a relationship between a torque of the accessory and a controlled variable corresponding to each rotational speed of the engine;
- after the learning condition is established, calculating, by the electronic control unit, an estimated value of the controlled variable based on a calculated value of the torque of the accessory and the engine rotational speed by reference to the relationship;
- calculating, by the electronic control unit, a command value of the controlled variable based on at least one of the engine rotational speeds, a degree of throttle opening, degree of accelerator opening and an air supply pressure;
- calculating, by the electronic control unit, a difference by comparing the estimated value of the controlled variable and the command value of the controlled variable;
- calculating, by the electronic control unit, a final value of the controlled variable based on the difference between the estimated value and the command value;
- and
- controlling the engine using the final value of the controlled variable, in an operational range other than an idling state.
An engine control method for controlling a gasoline engine with a hydraulic pump as an accessory, the engine control method comprising the steps of:
- storing in advance, in an electronic control unit including program logic, a relationship between a torque of the accessory and an amount of intake air corresponding to each rotational speed of the engine;
- establishing a learning condition after a predetermined period from a previous learning procedure has elapsed during a cargo handling operation through using the accessory driven by the engine while a car that travels by the engine is stopped;
- after the learning condition is established, calculating, by the electronic control unit, an estimated value of the amount of intake air based on a calculated value of the torque of the accessory and the engine rotational speed by reference to the relationship;
- calculating, by the electronic control unit, a command value of the amount of intake air based on at least one of the engine rotational speeds, a degree of throttle opening, degree of accelerator opening and an air supply pressure;
- calculating, by the electronic control unit, a difference by comparing the estimated value of the amount of intake air and the command value of the amount of intake air;
- calculating, by the electronic control unit, a command corrected value of the amount of intake air based on the difference;
- calculating, by the electronic control unit, a final value of the amount of intake air by adding the command corrected value of the amount of intake air to the command value of the amount of intake air or by subtracting the command corrected value of the amount of intake air from the command value of the amount of intake air;
- and
- controlling the engine using the final value of the amount of intake air.
An engine control method for controlling a diesel with a hydraulic pump as an accessory, the engine control method comprising the steps of:
- storing in advance, in an electronic control unit including program logic, a relationship between a torque of the accessory and a fuel injection amount corresponding to each rotational speed of the engine;
- calculating, by the electronic control unit, an estimated value of the fuel injection amount based on a calculated value of the torque of the accessory and the engine rotational speed by reference to the relationship;
- calculating, by the electronic control unit, a command value of the fuel injection amount based on at least one of the engine rotational speeds, a degree of throttle opening, degree of accelerator opening and an air supply pressure;
- calculating, by the electronic control unit, a difference by comparing the estimated value of the fuel injection amount and the command value of the fuel injection amount;
- calculating, by the electronic control unit, a command corrected value of the fuel injection amount based on the difference;
- calculating, by the electronic control unit, a final value of the fuel injection amount by adding the command corrected value of the fuel injection amount to the command value of the fuel injection amount or by subtracting the command corrected value of the fuel injection amount from the command value of the fuel injection amount;
- and
- controlling the engine using the final value of the fuel injection amount, during a cargo handling operation while a car with the engine is stopped.
Dependencies are inferred from the claim text.