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System and method for controlling ultra-capacitor charge and discharge in vehicles with auto start/stop systems

  • US 10,202,958 B2
  • Filed: 08/26/2015
  • Issued: 02/12/2019
  • Est. Priority Date: 07/15/2015
  • Status: Active Grant
First Claim
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1. A system comprising:

  • an ultra-capacitor and battery system comprising a battery, a DC-DC converter, and an ultra-capacitor;

    an auto stop/start module configured to perform an auto stop event of an engine of a vehicle and an auto start event of the engine of the vehicle based on operating parameters while an ignition is ON; and

    a voltage monitoring module configured to, in response to a request for the auto start event,selectively discharge the ultra-capacitor during cranking to compensate for a voltage dip in a battery voltage of the battery for the auto start event,calculate a plurality of voltage delta values by generating a difference between the battery voltage prior to the cranking and the battery voltage at predetermined time intervals during the cranking, wherein the plurality of voltage delta values are accumulated while the ultra-capacitor discharges during the cranking,calculate a voltage value based on the plurality of voltage delta values, andselectively disable the auto stop/start module when the voltage value is less than a predetermined threshold,wherein the voltage value comprises an average of the plurality of voltage delta values.

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