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Energy efficient electric vehicle control system

  • US 9,975,426 B2
  • Filed: 06/26/2014
  • Issued: 05/22/2018
  • Est. Priority Date: 06/26/2013
  • Status: Expired due to Fees
First Claim
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1. A lift truck comprising:

  • an electrical system comprising an electric power supply and an electric motor-generator connected to a drive train of the lift truck; and

    a hydraulic system for causing lifting of and additional auxiliary movements of a lift of the lift truck, the hydraulic system including a hydraulic pump/motor, a main hydraulic actuator configured to raise and lower the lift, and one or more auxiliary hydraulic actuators configured to cause the additional auxiliary movements of the lift;

    wherein the hydraulic system is configured to selectively redirect hydraulic power from the main hydraulic actuator to hydraulically power the one or more auxiliary actuators without redirection of said hydraulic power first to the hydraulic pump/motor.

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