Anti-skid electronic control system having an error detecting circuit
First Claim
1. An improvement in a digital anti-skid electronic control system including a different channel assigned to each controlled wheel, each of said channels having a converter to convert a sensed wheel velocity signal into a digital value and a digital arithmetic circuit connected to said converter to provide an output signal to control a final control element which controls braking pressure, said improvement comprising:
- a digital secondary circuit for each of said channels, each of said secondary circuits being identical with one of said arithmetic circuits, each of said secondary circuits being connected to the output of a different one of said converters; and
a digital circuit means coupled to said arithmetic circuit and said secondary circuit of each of said channels, said circuit means being responsive to predetermined output signals from each of said arithmetic circuits and each of said secondary circuits to detect an error condition in any of said arithmetic circuits and any of said secondary circuits and to disable said control system entirely upon detection of said error condition.
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Accused Products
Abstract
A secondary circuit identical to the primary arithmetic circuits is provided for an anti-skid electronic control system. The outputs of the secondary and primary circuits are connected in a predetermined manner to a comparator arrangement. If an error occurs in the secondary and/or primary circuits, the comparator will detect the error and render the entire anti-skid system inoperable.
22 Citations
7 Claims
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1. An improvement in a digital anti-skid electronic control system including a different channel assigned to each controlled wheel, each of said channels having a converter to convert a sensed wheel velocity signal into a digital value and a digital arithmetic circuit connected to said converter to provide an output signal to control a final control element which controls braking pressure, said improvement comprising:
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a digital secondary circuit for each of said channels, each of said secondary circuits being identical with one of said arithmetic circuits, each of said secondary circuits being connected to the output of a different one of said converters; and a digital circuit means coupled to said arithmetic circuit and said secondary circuit of each of said channels, said circuit means being responsive to predetermined output signals from each of said arithmetic circuits and each of said secondary circuits to detect an error condition in any of said arithmetic circuits and any of said secondary circuits and to disable said control system entirely upon detection of said error condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification