Internal-combustion engines – Charge forming device – Supercharger
Patent
1995-12-29
1999-03-02
Koczo, Michael
Internal-combustion engines
Charge forming device
Supercharger
60609, F02B 3906, F02B 3704
Patent
active
058757660
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a supercharging device for a vehicle engine, and a control method therefor, and in particular to a supercharging device for an engine that supercharges air that is supplied to a vehicle engine that is to be used in a construction machine, etc., to increase the output of the engine, and to a control method therefor.
BACKGROUND OF THE INVENTION
Conventionally, supercharging devices are employed for vehicle engines that are used in cars, trucks, wheel loaders, wheel cranes, etc., that run on wheels, so that a high power output with a compact size can be provided while obtaining the acceleration. As such supercharging devices (superchargers), there are a mechanical supercharging system, which employs a part of an engine's output or power from another mechanism, and a turbocharger system that employs exhaust gas. In the mechanical supercharging system, a compressor, such as a Roots blower supercharger, which is commonly employed, is mechanically driven by an engine via a belt, etc.
In a conventional mechanical supercharging system, however, meaningless supercharging at a predetermined level or higher is performed within a high-speed and low-load range, even though it is not necessary. The mechanical power loss due to the supercharger is thus increased, and the overall efficiency of the engine is degraded. In a supercharging system that uses a turbocharger, the acceleration for the vehicle is inferior when the engine acceleration is begun at a low idle rotational state. Since the exhaust energy provided by the engine is low and the rotation of the turbocharger is reduced accordingly, the volume of the pressurized air that is charged to the engine in this state is small, and a high torque can not be generated. As a result, turbo lag occurs, there is a slight delay before the vehicle begins to accelerate, and the operator feels that the vehicle is not responding well. In addition, when a high output engine that provides little exhaust is adapted for use with a supercharger, engine braking efficiency is reduced.
DISCLOSURE OF THE INVENTION
To resolve the above described conventional shortcomings, it is one object of the present invention to provide a supercharging device for a vehicle engine, for use in construction machines, etc., that has high acceleration performance, that is compactly made but provides high output, and that provides good engine braking efficiency, and a method for controlling such a supercharging device.
According to the present invention, a vehicle engine, on which is mounted a mechanical supercharger that is driven by mechanical means using an output of the engine, comprises: a differential planetary gear device, which is connected to the vehicle engine and which has differential limiting means for distributing power, that is produced by the vehicle engine, for driving a mechanical supercharger and for propelling the vehicle; and the mechanical supercharger, which is to be driven by the differential planetary gear device. The vehicle engine comprises an accelerator position detection sensor, which is additionally attached to an accelerator that controls an output of the vehicle engine, or an engine rotational speed detection sensor, for detecting a rotational speed of the vehicle engine; a shift position detection sensor, which is additionally provided for a shift lever by which a speed range of a vehicle is selected; and a controller that receives signals from the accelerator position detection sensor, the engine rotational speed detection sensor, and the shift position detection sensor, and that controls the differential limiting means of the differential planetary gear device. The differential limiting means of the differential planetary gear device is controlled by the controller, which receives a speed signal from a vehicle speed detection sensor that is attached to a drive shaft of the vehicle.
Further, the present invention comprises: a differential planetary gear device, which is connected to an engine and which has differ
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patent: 1645178 (1927-10-01), Hall-Brown
patent: 1732405 (1929-10-01), Invernizzi
patent: 2949902 (1960-08-01), Calovolo
patent: 3296791 (1967-01-01), Richard et al.
patent: 3349759 (1967-10-01), Castelet
patent: 3665787 (1972-05-01), Wilkinson
patent: 3673797 (1972-07-01), Wilkinson
Kabushiki Kaisha Komatsu Seisakusho
Koczo Michael
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