Patent ID: 7145301
Filing Date: 2006-12-05
Classification: B60L,B66F,Y02P

Abstract:
1. A battery operated industrial truck comprising at least one first electric motor and at least one second electric motor, each electric motor being adapted to be operated selectively as a driving motor or as a generator, respectively and each being connected to a common battery through electric control means such that electric energy is fed back into the battery of an electric motor if operated as generator, protection means being provided to protect electric or electronic parts connected to the battery and/or to at least one of the electric motors, against an excess voltage generated by one of the electric motors when operated as a generator, the protection means include voltage measuring means associated with each electric motor, threshold means being provided generating a switching signal for a switching device if the voltage measuring means measure a voltage of the generator operated motor reaching or exceeding a threshold in the threshold means, the switching device being connected such that the generator operated motor is connected to the other electric motor representing the load when the switching signal of the threshold means is generated.