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Brake control apparatus and method

  • US 4,352,049 A
  • Filed: 11/26/1979
  • Issued: 09/28/1982
  • Est. Priority Date: 11/26/1979
  • Status: Expired due to Term
First Claim
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1. In control apparatus for a motor coupled with a vehicle and including a chopper apparatus in the brake mode to supply current to a power supply line, with a filter capacitor connected across said chopper apparatus, the combination of:

  • means for producing a voltage signal in accordance with the voltage across said filter capacitor,brake control means connected across said filter capacitor,means responsive to the current flow in relation to the power line for providing a desired reference voltage for said filter capacitor and having a value determined by said current flow,means responsive to said voltage signal for providing an error signal in relation to said desired reference voltage value for said filter capacitor voltage,means connected with said chopper apparatus for providing a control signal having a known frequency for determining the operation of said chopper apparatus in accordance with said known frequency, andsignal means responsive to each of the error signal and the control signal and connected with said brake control means for determining the operation of the brake control means in accordance with said known frequency and for a time period proportional to the magnitude of said error signal.

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