Abrégé

An electric jack load balancing method and device for reducing the difference in load carried by each jack of a pair of electric jacks while adjusting the attitude of a platform. The device includes a controller configured to reduce the difference in load carried by each jack of a pair of electric jacks. The method includes monitoring the power draws of the jack motors of the pair of electric jacks, comparing the ratio of the power draws of the jack motors to a predetermined desirable power draw ratio, and when the jack motor power draw ratio differs from the desirable power draw ratio, modifying the operation of the jacks in such a way as to decrease the difference between their actual power draw ratio and the predetermined desirable power draw ratio.

Classes IPC  ?

• H02P 1/22 - Dispositions de démarrage de moteurs électriques ou de convertisseurs dynamo-électriques pour faire démarrer des machines dynamo- électriques ou des convertisseurs dynamo-électriques pour faire démarrer individuellement un moteur à courant continu dans l'un ou l'autre sens de rotation
• B60S 9/00 - Dispositifs sur les véhicules, venant en contact avec le sol, pour supporter, soulever ou manœuvrer le véhicule, entièrement ou en partie, p. ex. crics incorporés
• B60F 7/21 -

Abrégé

A method and apparatus for increasing platform attitude adjustment range for platforms supported by jacks in which the apparatus includes jacks for supporting a platform at spaced-apart locations, jack drive mechanisms, and a controller connected to each of the jacks through their respective jack drive mechanisms and programmed to adjust platform attitude by coordinating jack movement. The controller coordinates jack movement by selecting and commanding at least one of the jacks to retract and selecting and commanding at least one other of the jacks to extend.

Classes IPC  ?

• G01M 1/00 - Test d'équilibrage statique ou dynamique des machines, des structures ou des ouvrages

Abrégé

A method and device for detecting the stroke limit of an electric motor-driven jack while the jack is being used to adjust the attitude of a mobile platform. A controller is programmed to detect when an electric jack motor has driven a jack to a jack stroke limit by monitoring one or more jack motor power draw characteristics and comparing those values to known values associated with the driving of a jack at or near the end of a jack stroke.

Classes IPC  ?

• H02P 1/22 - Dispositions de démarrage de moteurs électriques ou de convertisseurs dynamo-électriques pour faire démarrer des machines dynamo- électriques ou des convertisseurs dynamo-électriques pour faire démarrer individuellement un moteur à courant continu dans l'un ou l'autre sens de rotation
• B66F 7/21 -

Abrégé

An electric jack ground contact detection method and device for detecting ground contact of an electric motor-driven jack as the jack is being extended to adjust the attitude of a mobile platform. The device includes a controller that monitors the electrical power draw of an electric motor-driven jack while the jack is being extended for use in adjusting the attitude of a mobile platform. The controller recognizes jack ground contact when the monitored power draw value exceeds a ground contact power draw value consistent with jack ground contact. The controller calculates the ground contact power draw value as equaling the sum of a dynamically-adjusted threshold power draw value associated with jack extension before ground contact and a power draw increase value equaling an amount of additional power that the jack is known to draw as a result of jack ground contact.

Classes IPC  ?

• H02P 7/00 - Dispositions pour réguler ou commander la vitesse ou le couple de moteurs électriques à courant continu