Industrial truck having increased static or quasi-static tipping stability

• US 20050281656A1
• Filed: 04/06/2005
• Published: 12/22/2005
• Est. Priority Date: 04/07/2004
• Status: Active Grant

• Current Assignee: Linde Material Handling GmbH (Superlift Holding SARL)
• Original Assignee: Linde AG (Linde Plc)
• Inventors: Carlitz, Andreas, Gotz, Bernhard, Roth, Jurgen, Schroder, Frank, Bozem, Gerhard
• Granted Patent: US 7,706,947 B2
• Time in Patent Office: Days
• US Class Current: 414/635
• CPC Class Codes: B66F 17/003 for fork-lift trucks

Abstract

A forward-control counterweight fork-lift truck has a liftable and tiltable load-lifting device (1), a traction drive and operating drives for the movement of the load-lifting device (1). A calculation model (D) is stored in a control device (SE), to which directly or indirectly acting sensors (S) are connected for detecting the lifting load (L), the lifting height (H), the tilting angle (WM), the load torque (M), the direction of travel (R), the driving speed (V), and the steering angle (WL). The control device (SE) is designed to determine a driving and load state (Z) based on the detected physical variables (L, H, WM, M, R, V, WL) and the stored calculation model (D) and is operatively connected to the traction drive and the operating drives. Depending on the driving and load state (Z) determined, the operating speed, starting and braking acceleration, and driving speed are each reduced.

Claims

1. An industrial truck, comprising:

a liftable and tiltable load-lifting device;

a traction drive and operating drives for movement of the load-lifting device;

a control device, wherein a calculation model, which is based on vehicle-specific information, for static and/or quasi-static tipping behavior of the industrial truck is stored in the control device; and

directly or indirectly acting sensors connected to the control device for detecting a lifting load, a lifting height, a tilting angle, a load torque, a direction of travel, a driving speed, and a steering angle,

wherein the control device is designed to determine a driving and load state which is based on the detected physical variables and the stored calculation model and is operatively connected to the traction drive and the operating drives such that, depending on the driving and load state determined, one or more of the operating speed, starting and braking acceleration, and driving speed, which can be achieved or are achieved, are reduced.

2. The industrial truck according to claim 1, wherein a priority is the reduction in the starting and braking acceleration and driving speed which can be achieved or are achieved.

3. The industrial truck according to claim 1, wherein vehicle-specific information contained in the control device at least comprises data on the dimensions and the weights of the industrial truck and the load-lifting device and on the load.

4. The industrial truck according to claim 1, wherein, in the control device, at least the following driving maneuvers which are critical to tipping are monitored:

braking whilst travelling forward with the vehicle being inclined forward, accelerating whilst reversing with the vehicle being inclined forward, braking out of reverse travel on a bend with the vehicle being inclined perpendicular to the tipping axis, and accelerating forward on a bend with the vehicle being inclined perpendicular to the tipping axis.

5. The industrial truck according to claim 1, wherein the truck is a forward control counterweight fork-lift truck.

6. The industrial truck according to claim 2, wherein vehicle-specific information contained in the control device at least comprises data on dimensions and weights of the industrial truck and the load-lifting device and on the load.

7. The industrial truck according to claim 2, wherein, in the control device, at least the following driving maneuvers which are critical to tipping are monitored:

braking whilst travelling forward with the vehicle being inclined forward, accelerating whilst reversing with the vehicle being inclined forward, braking out of reverse travel on a bend with the vehicle being inclined perpendicular to the tipping axis, and accelerating forward on a bend with the vehicle being inclined perpendicular to the tipping axis.

8. The industrial truck according to claim 3, wherein, in the control device, at least the following driving maneuvers which are critical to tipping are monitored:

braking whilst travelling forward with the vehicle being inclined forward, accelerating whilst reversing with the vehicle being inclined forward, braking out of reverse travel on a bend with the vehicle being inclined perpendicular to the tipping axis, and accelerating forward on a bend with the vehicle being inclined perpendicular to the tipping axis.