Air Conditioning systems and methods for vehicles
AssigneeSanden Corporation
InventorSeichi Nakajima
Life of this patent
Estimating the term…
Abstract
An air conditioning system for a vehicle comprises a compressor, an electric motor for driving the compressor, a device for variably controlling a rotational speed of a drive shaft of the compressor based on a target rotational speed of the drive shaft of the compressor; a device for limiting the rotational speed of the drive shaft of the compressor to less than the target rotational speed of the compressor when a first value of a current detected at the electric motor is greater than or equal to a first predetermined value; and a device for terminating the limiting of the rotational speed of the drive shaft of the compressor when a second value of the detected current is less than a second predetermined value during the limit operation.
Claims15
A vehicle air conditioning system comprising:
- a compressor;
- an electric motor for driving said compressor;
- means for variably controlling a rotational speed of a drive shaft of said compressor based on a target rotational speed of said drive shaft of said compressor;
- means for limiting said rotational speed of said drive shaft of said compressor to less than said target rotational speed when a first value of a current detected at said electric motor is greater than or equal to a first predetermined value;
- and
- means for terminating said limiting of said rotational speed of said drive shaft of said compressor when a second value of said detected current is less than a second predetermined value.
A method of controlling an air conditioning system comprising a motor-driven compressor, the method comprising the steps of:
- detecting an electric current at an electric motor;
- comparing a first value of said detected current to a first predetermined value;
- and limiting a rotational speed of a drive shaft of said compressor if said first value is greater than or equal to said first predetermined value.
An air conditioning system comprising:
- a compressor;
- an electric motor for driving said compressor;
- and
- a control device for regulating a rotational speed of said electric motor, so that a drive shaft of said compressor rotates at a target rotational speed based on an air conditioning load,
- wherein said control device detects a first value of an electric current at said electric motor and limits said rotational speed of said electric motor if said first value is greater than or equal to a first predetermined value, so that said rotational speed of said drive shaft of said compressor remains below said target rotational speed.
Dependencies are inferred from the claim text.