초록 ▼

The invention relates generally to steerable vehicles, particularly fork lift trucks, which include one or more travel drive motors adapted to be controlled in a predetermined manner, and a steerable swivelled wheel assembly. To increase the safety of such vehicle in operation, an electrically contr

The invention relates generally to steerable vehicles, particularly fork lift trucks, which include one or more travel drive motors adapted to be controlled in a predetermined manner, and a steerable swivelled wheel assembly. To increase the safety of such vehicle in operation, an electrically controlled drive control system is provided which is simple and free from elements that are susceptible to wear. For this purpose, two speed sensors are provided on opposite sides of the vehicle and cooperate with respective coaxial road wheels and are connected by a comparator to a switching system for controlling the travel drive, e.g., to a travel control signal generator. Elements for applying at least one additional speed-influencing input signal are associated with the comparator.

대표청구항 ▼

In an electrically controlled travel drive control system for a steerable vehicle comprising a steerable axle assembly having swivelled first road wheel means, a second axle assembly spaced from said steerable axle assembly in the longitudinal direction of the vehicle and having second road wheel me

In an electrically controlled travel drive control system for a steerable vehicle comprising a steerable axle assembly having swivelled first road wheel means, a second axle assembly spaced from said steerable axle assembly in the longitudinal direction of the vehicle and having second road wheel means, one of said road wheel means comprising two road wheels disposed on opposite sides of said vehicle, and travel drive motor means operatively connected to at least one of said road wheel means, the improvement residing in that two speed sensors are associated with said two road wheels and operable to generate speed signals which are representative of the speeds of the respective road wheels, a comparator is arranged to receive said speed signals and to generate an output which depends on the difference between said speed signals, additional input means are provided and adapted to receive an additional input signal, a switching system is provided, which is adapted to generate a travel drive control signal for controlling said travel drive motor means in dependence on the difference between said speed signals and on said additional input signal, said steerable axle assembly comprises an angularly movable bogie and two road wheels mounted in said bogie and disposed on opposite sides of said vehicle, said travel drive motor means comprise two travel drive motors, one of said road wheel means comprises two road wheels disposed on opposite sides of said vehicle and operatively connected to respective ones of said travel drive motors, a proximity sensor is associated with said steerable axle assembly and adapted to deliver an output signal which depends on the angular position of said bogie, and said switching system is adapted to control said travel drive motors in dependence on the output signal of said proximity sensor.