Error detection and display system
First Claim
1. An error detection and display system for an apparatus having first and second operating states, comprisingmeans for detecting errors of a first kind which occur and can be detected in said first operating state of said apparatus, and for detecting errors of a second kind which occur and can be detected only in said second operating state of said apparatus,means for displaying the presence of said errors of said first and second kinds,erasable non-volatile error memory means for storing the occurrence of at least said errors of said second kind, andswitch-on control means for switching on and keeping on said error detection means and said display means, for switching off said display means while said apparatus is in said first operating state if no error of the first kind is detected by said error detection means and no error of the second kind is stored in said error memory means, and for switching off said display means during said second operating state of said apparatus if an error of the second kind is stored in said error memory means only if said error detection means does not detect an error of the first or second kind.
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Accused Products
Abstract
An error detection and display system for an apparatus having first and second operating states comprises a testing device, a display unit (e.g., a warning light), and a switch-on control unit. The testing device runs primary error test cycles for detecting errors of a first kind which occur during the first operating state of the apparatus (e.g., a vehicle at standstill), and secondary error test cycles which occur and can be detected only in the second state of the apparatus (e.g., the vehicle moving above a predetermined minimum speed). The system also includes a non-volatile memory wherein all occurrences of errors of the second kind are stored. The switch-on control unit switches on the testing device and the warning light when the vehicle is first started. If no error of the first kind is detected by the testing device and no error of the second kind is stored in the error memory, the switch-on control unit switches off the warning light while the vehicle is still at a standstill. However, if an error of the second kind is stored in the error memory, the switch-on control unit will keep the warning light on until the vehicle is traveling above the predetermined minimum speed and no new errors of the first or second kind are detected by the testing device.
40 Citations
23 Claims
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1. An error detection and display system for an apparatus having first and second operating states, comprising
means for detecting errors of a first kind which occur and can be detected in said first operating state of said apparatus, and for detecting errors of a second kind which occur and can be detected only in said second operating state of said apparatus, means for displaying the presence of said errors of said first and second kinds, erasable non-volatile error memory means for storing the occurrence of at least said errors of said second kind, and switch-on control means for switching on and keeping on said error detection means and said display means, for switching off said display means while said apparatus is in said first operating state if no error of the first kind is detected by said error detection means and no error of the second kind is stored in said error memory means, and for switching off said display means during said second operating state of said apparatus if an error of the second kind is stored in said error memory means only if said error detection means does not detect an error of the first or second kind.
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23. A process for detecting and displaying errors in an apparatus having first and second operating states, comprising
displaying an error signal when said apparatus is turned on, running a test cycle during said first operating state to determine if there is an error of a first kind which occurs and can be detected during said first operating state of said apparatus, determining whether an error of a second kind which occurs and can be detected only during said second operating state has previously occurred in said apparatus, if said error of the second kind has previously occurred, keeping said display signal on until said apparatus has entered its second operating state and no error of the first or second kind is detected.
Specification