Method and apparatus for fault detection in a torque machine of a powertrain system
First Claim
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1. Method for operating a powertrain system including a torque machine mechanically coupled to an internal combustion engine, comprising:
- upon detecting a pending hardware desaturation fault associated with one of a plurality of power switches configured to control power flow to the torque machine,employing a diagnostic circuit to disable control signals to all of the power switches,executing a motor control hardware reset to re-enable operation of all of the power switches, andexecuting retry events comprisingre-enabling the control signals to all the power switches,ramping torque capability for the torque machine from zero to its expected value andre-enabling disabled powertrain system functions, wherein the retry event;
are iteratively executed with a debounce time period preceding each retry event; and
detecting, by the diagnostic circuit, a presence of a mature hardware desaturation fault associated with the power switch when a quantity of the retry events during a time window exceeds a threshold.
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Abstract
A method for operating a powertrain system including a torque machine mechanically coupled to an internal combustion engine includes, upon detecting a pending fault associated with a power switch configured to control power flow to the torque machine, disabling torque output from the torque machine and executing retry events. The retry events are iteratively executed with a debounce time period preceding each retry event. Presence of a fault associated with the power switch is detected when a quantity of the retry events during a time window exceeds a threshold.
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Citations
19 Claims
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1. Method for operating a powertrain system including a torque machine mechanically coupled to an internal combustion engine, comprising:
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upon detecting a pending hardware desaturation fault associated with one of a plurality of power switches configured to control power flow to the torque machine, employing a diagnostic circuit to disable control signals to all of the power switches, executing a motor control hardware reset to re-enable operation of all of the power switches, and executing retry events comprising re-enabling the control signals to all the power switches, ramping torque capability for the torque machine from zero to its expected value and re-enabling disabled powertrain system functions, wherein the retry event;
are iteratively executed with a debounce time period preceding each retry event; anddetecting, by the diagnostic circuit, a presence of a mature hardware desaturation fault associated with the power switch when a quantity of the retry events during a time window exceeds a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Method for operating a powertrain system including a torque machine mechanically coupled to an internal combustion engine, comprising:
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monitoring fault signals output from a plurality of power switches configured to control power flow to the torque machine; employing a diagnostic circuit to disable torque output from the torque machine upon detecting a pending fault associated with one of the power switches; executing a motor control hardware reset to re-enable operation of all of the power switches to execute retry events; iteratively executing the retry events subsequent to disabling torque output comprising re-enabling the control signals to all the power switches, ramping torque capability for the torque machine from zero to its expected value and re-enabling disabled powertrain system functions; and detecting, by the diagnostic circuit, a mature fault when a quantity of the retry events during a time window exceeds a threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. Method for operating a powertrain system including a torque machine mechanically coupled to an internal combustion engine, comprising:
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disabling, by a diagnostic circuit, torque output from the torque machine, executing a motor control hardware reset to re-enable operation of all of the power switches to execute retry events, and executing retry events upon detecting a pending fault associated with a power switch configured to control power flow to the torque machine, said retry events comprising re-enabling the control signals to all the power switches, ramping torque capability for the torque machine from zero to its expected value and re-enabling disabled powertrain system functions; discontinuing executing the retry events when the pending fault clears; and reporting presence of a mature fault associated with the power switch when a quantity of the retry events during a time window exceeds a threshold.
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Specification