Disclosed is a method for mitigating brake failure where a brake capacity is determined to be less than each of a first braking target and a mitigation threshold target. The vehicles current speed is compared to an engine braking threshold. If the vehicle speed is above said threshold, then the vehicle transmission is operated to inhibit transfer of an input torque through the transmission, for example by disengaging the output shaft from the gears of the transmission. If the vehicle speed is below a wheel lock threshold, then the rotation of an output shaft of the transmission is also inhibited. This may be a complete transmission tie-up. If the vehicle speed is below the engine braking threshold, then the transmission may be downshifted or put in neutral. The torque of the engine may also be reduced. The brake capacity may be updated based on a failure message with data which indicates one or more malfunctioning conditions of the vehicle braking system. The braking capacity and/or engine braking threshold may be updated based upon vehicle environmental conditions and vehicle path conditions. If braking mitigation cannot avoid collision, evasive manoeuvres may be applied.
System and method for vehicle subsystem failure mitigation
2017-09-27
Patent
Elektronische Ressource
Englisch
IPC: | B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion |
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