Device for controlling turbocharger with rotary electric machine
AssigneeIsuzu Motor Limited
InventorHideo Kawamura
Life of this patent
Estimating the term…
Abstract
A device for controlling a turbocharger with a rotary electric machine detects, at all times, the rotational speed of an engine of a motor vehicle and an amount of depression of the accelerator pedal to monitor present running conditions of the motor vehicle. A required boost pressure subject to the running conditions is determined, and if a difference between the required boost pressure and a present boost pressure is greater than a prescribed value, the device determines that the motor vehicle is running under conditions which require quick acceleration. The device then drives the rotary electric machine coupled to the rotatable shaft of the turbocharger as a motor to increase the speed of rotation of the turbocharger for a quick buildup of the boost pressure.
Claims9
A device for controlling a turbocharger of a motor vehicle engine having an accelerator pedal, comprising:
- a turbine mounted on the engine of the motor vehicle being drivable by exhaust gases emitted from the engine;
- a rotatable shaft coupled to said turbine;
- a compressor coupled to said rotatable shaft delivering air under pressure into the engine;
- a rotary electric machine coupled to said rotatable shaft;
- an engine speed sensor connected to the engine, detecting a rotational speed of the engine and providing a corresponding signal;
- an accelerator sensor connected to the accelerator pedal, detecting an amount of depression of the accelerator pedal and providing a corresponding signal;
- a boost pressure sensor connected to said compressor detecting a boost pressure of the air delivered to the engine;
- a battery mounted on the motor vehicle and connected to said rotary electric machine;
- means for calculating a required boost pressure based on the signals from said engine speed sensor and said accelerator sensor;
- and
- control means for driving said rotary electric machine as a motor and supplying electric power from said battery to said rotary electric machine if a difference between said calculated required boost pressure and the boost pressure detected by said boost pressure sensor is greater than a predetermined value.
A device for optimizing boost pressure of an engine having an accelerator, according to running conditions, said device comprising:
- a turbocharger providing air with a boost pressure into the engine;
- a rotary electric machine coupled to said turbocharger being operable as a motor;
- means for detecting a speed of the engine, an amount of accelerator movement and a boost pressure of the turbocharger;
- means for calculating a required boost pressure on the basis of the detected speed of the engine and the detected amount of accelerator movement, a first difference between the required boost pressure and the detected boost pressure, a characteristic boost pressure value of said turbocharger corresponding to the detected speed of the engine, and a second difference between the required boost pressure and the characteristic boost pressure value;
- and
- means for operating said rotary electric machine as the motor in accordance with the first difference, the second difference and a predetermined difference value.
Dependencies are inferred from the claim text.