Showing papers on "Hybrid drive published in 1980"

Hybrid drive for a vehicle, in particular an automobile

Abstract: A hybrid drive for a vehicle includes an electric engine supplied with energy from an electrical storage device and capable of returning energy back to the storage device. The electric engine is connected with a driving axle of the vehicle by a first disconnecting clutch and to an internal combustion engine arranged in series therewith by a second disconnecting clutch. Operation of these clutches can be independent of each other. In order to save fuel the internal combustion engine is not supplied with a dedicated flywheel, but instead utilizes the rotating masses of the drive between the disconnection points of the two clutches, e.g., the rotating elements of the electric engine, as a flywheel.

Omnibus hybrid drive with separate motor for auxiliaries - coupled to main motor or auxiliary power unit via respective freewheel couplings

Abstract: The drive uses a main electric drive motor which is permanently coupled to the driving axis and an auxiliary power unit selectively coupled to the shaft of the main drive motor. The auxiliaries to the drive system e.g. the hydraulic pump, have a separate electric motor the shaft of which is connected via respective freewheel couplings with either the shaft of the main drive motor or the driving shaft of the auxiliary power unit. An intermediate gear train may be incorporated between the second freewheel coupling and the driving shaft of the auxiliary power unit.

An Assessment of Flywheel Energy Storage in Electric Vehicles

Abstract: The analysis and design of a hybrid drive for a 75-tonne (84 ton) urban delivery van are described The drive consists of a flywheel for vehicle acceleration, and a battery pack and compound-wound direct current motor for steady-state power The motor output is automatically regulated and the continuously variable transmission (CVT) is controlled to match the flywheel to the vehicle demand Various types of CVT are considered, and their relative merits compared It is concluded that rolling friction drives offer the best solution for vehicle applications Digital simulation results are presented comparing the hybrid with an equivalent electric drive for a standard vehicle duty cycle The effect of varying the flywheel capacity and regenerative braking benefits are examined It is shown that the hybrid drive offers a significant increase in vehicle range

Drive systems with brake-energy recovery

Abstract: Intended for use in city buses in regular service, two hybrid drive systems have been developed for storing recovered brake energy: a mechanical flywheel storage (gyrobus) and a hydraulic storage (hydrobus) system. The drive units comprise a diesel engine with an infinitely variable transmission, and the energy storage system arranged under the floor and connected to the transmission. The greatest fuel savings can be realized with the hydrobus, in which no stored energy is lost due to idling, although the purchase price and weight of this bus are higher. Current figures show that the hybrid drives with brake-energy recovery can attain or may exceed the economic efficiency of standard buses. Further development, such as optimizing the drivetrains and increasing the energy density of the storage systems, will enhance efficiency. Apart from a 10% to 25% fuel savings, which will offset the additional investment, these systems offer improved drive characteristics (including speed) and reduced pollution.