Two hybrid versions of a forest tractor
In this paper the authors consider two different hybrid drive systems for a small caterpillar tractor used for logging in forests. The first one is a series hybrid electric propulsion system. It is composed of an internal combustion (IC) engine, an electric generator, a group of lead-acid batteries and electric drive motors. The second one is a series hybrid hydraulic propulsion system. It is composed of an IC engine, hydraulic pump, a group of hydraulic accumulators and hydraulic motors. Generally, vehicles employed in forestry and agricultural works are characterized by low utilization of the available installed power. It stems from oversizing IC engine in a conventional driveline in order to supply the maximum power. Since the mean required power over a duty cycle is often substantially lower, a series hybrid drive system has potential for improving fuel economy, reducing pollutant emission and noise level. Series hybrids generally feature small engines because they are sized to provide only the average vehicle power demand. Sizing of the engine and other drive system components is significantly different in a hybrid vehicle than in a conventional forest tractor in which the engine is the only source of power to drive the vehicle or to lift wood. In a hybrid crawler, the power required at any time is split between auxiliary power unit (IC engine/electric generator or IC engine/hydraulic pump) and load leveling device (batteries or hydraulic accumulators). The engine can be decoupled from the terrain load. This may allow the engine to be operated near its most efficient fuel consumption conditions or else turned off. The presented hybrid powertrains are compared with the conventional one and one to another. Each of them has its own advantages and disadvantages. To evaluate the performance of the proposed solutions a special forest cycle was used.
- Research Organization:
- Universita della Tuscia, Viterbo (IT)
- OSTI ID:
- 20000209
- Resource Relation:
- Conference: 33rd Intersociety Energy Conversion Engineering Conference, Colorado Springs, CO (US), 08/02/1998--08/06/1998; Other Information: 1 CD-ROM. Operating system required: Windows 3.x; Windows 95/NT; Macintosh; UNIX. All systems need 2X CD-ROM drive., PBD: 1998; Related Information: In: Proceedings of the 33. intersociety energy conversion engineering conference, by Anghaie, S. [ed.], [2800] pages.
- Country of Publication:
- United States
- Language:
- English
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