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Drive circuit for an injector arrangement and a diagnostic method

  • US 20070227506A1
  • Filed: 04/03/2007
  • Published: 10/04/2007
  • Est. Priority Date: 04/03/2006
  • Status: Active Grant
First Claim
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1. A drive circuit for an injector arrangement comprising a fuel injector, the drive circuit comprising a diagnostic tool (RH, RL) operable:

  • a) to sense a measured voltage (VBIAS) between the injector and a known voltage level (VBAT, VGND), the measured voltage (VBIAS) being biased with respect to the known voltage (VBAT, VGND) to a predicted voltage (VPinjN, VBcalc) unless the drive circuit has a fault; and

    b) to provide a fault signal on sensing of a measured voltage (VBIAS) that differs from the predicted voltage (VPinjN, VBcalc).

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