Vehicle with supplemental energy storage system for engine cranking

  • US 6,242,887 B1
  • Filed: 08/31/2000
  • Issued: 06/05/2001
  • Est. Priority Date: 08/31/2000
  • Status: Active Grant
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First Claim
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1. In a vehicle comprising an internal combustion engine, a generator driven by the engine, a cranking motor coupled with the engine to crank the engine, and a battery coupled with the cranking motor, the improvement comprising:

  • a double layer capacitor characterized by a capacitance greater than 320 farads and an internal resistance at 1 kHz and 20°

    C. less than 0.008 ohms;

    a set of paths interconnecting the generator and the capacitor, said set of paths comprising a circuit for preventing the capacitor from discharging excessively and a switch;

    a switch controller operative to open the switch automatically to protect the capacitor against excessive discharge during non-cranking conditions, and to close the switch automatically during cranking conditions; and

    a charging voltage controller operative to increase a charging voltage applied to the capacitor at temperatures below a threshold temperature as compared to the charging voltage applied to the capacitor at temperatures above the threshold temperature.

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