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AssigneeDenso Corporation
InventorsTakeshi Wakisaka, Kazuhito Miyagawa
Estimating the term…
A vehicle refrigerating cycle device capable of preventing the air-conditioning from becoming inadequate and capable of improving vehicle fuel economy is installed in a vehicle having both, a vehicle engine capable of carrying out stratified combustion and a brake booster. Negative pressure generated in an intake system of the engine is accumulated as brake negative pressure, which drives the brake booster. The refrigerating cycle device has a variable displacement type compressor driven by the vehicle engine and a negative pressure detection means for detecting the brake negative pressure. In the stratified combustion operation and at the time of the brake operation to cause the vehicle to stop, the volume in the compressor is controlled to reduce the load on the compressor by a prescribed amount when the detected brake negative pressure is below a prescribed value. Then, the volume in the compressor is gradually increased.
A vehicle refrigerating cycle device for a vehicle, installed in a vehicle having a vehicle engine capable of carrying out stratified combustion and a brake booster, negative pressure generated in an intake system of the engine being accumulated as brake negative pressure, said brake booster being driven by the brake negative pressure, said refrigerating cycle device comprising:
A method of controlling a vehicle refrigerating cycle device, installed in a vehicle having a vehicle engine capable of carrying out stratified combustion, and a brake booster, negative pressure generated in an intake system of the engine being accumulated as brake negative pressure, said brake booster being driven by the brake negative pressure,
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
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For compression type machines, plants or systems: compressor control arrangements
Control means therefor: vehicle drive related control of the compressor drive means, e.g. for fuel saving purposes
Information from a variable is obtained: related to the operation of the vehicle
Related to a compressing unit: to control the volume of a compressor
Term end not estimated
This application is based upon, claims the benefit of priority of, and incorporates by reference, the contents of Japanese Patent Application No. 2002-117456 filed Apr. 19, 2002.
1. Field of the Invention
The present invention relates to a refrigerating cycle device for a vehicle and a controlling method thereof.
FIG. 1 is a diagram showing the general structure of a system including a refrigerating cycle device for a vehicle according to the present invention;
FIG. 2 is a cross-sectional view of the compressor in FIG. 1;
FIG. 3 is a flow chart for use in illustrating how a compressor is controlled according to a first embodiment of the invention;
[First Embodiment]
A first embodiment of the invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a diagram showing the general structure of a system including a refrigerating cycle device for a vehicle 1 according to the embodiments. A vehicle in which the refrigerating cycle device 1 is installed has a vehicle engine E/G 11, hereinafter simply referred to as an “engine.” The engine 11 is capable of switching the combustion method between homogeneous combustion and stratified combustion.
In homogeneous combustion, a homogenous air-fuel mixture, that is, when fuel is homogeneously mixed in air, is combusted when a high revolution load requiring high power is requested, so that sufficient engine power is obtained. In the stratified combustion operation, when a lot of power is not requested, as in the case of a low revolution load, the fuel density around the ignition plug is increased in order to improve the ignition performance, so that the average air/fuel ratio of the air-fuel mixture is higher than a theoretical air/fuel ratio. In this way, fuel economy can be improved. In the stratified combustion operation, a throttle valve 11b is controlled more to the open side as compared to the case of the homogeneous combustion operation.