US 10,876,627 B1Granted

Gear ratio gradient specified vehicle accelerations for optimized shift feel

AssigneeFca US LLC

InventorsRyan J Monroe, Mustafa Acar, Avinash Jonnalagadda, Bruce K Geist, Timothy J White, Cory E Bruckner

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Abstract

Calibration and simulation techniques for modeled gear shift events of an automatic transmission of a vehicle comprise obtaining a set of parameters for a modeled gear shift event of the transmission and, based on the set of parameters, modeling forward/aft vehicle acceleration caused by the modeled gear shift event. A shift quality rating system is the utilized to obtain a shift quality rating of the modeled gear shift event based on at least one of the set of parameters and the modeled forward/aft vehicle acceleration. Finally, the techniques determine whether the determined shift quality rating satisfies a shift quality rating threshold and, when the determined shift quality rating fails to satisfy the shift quality rating threshold, a gear ratio gradient for the modeled gear shift event is adjusted and the process is repeated until the determined shift quality rating satisfies the shift quality rating threshold.

Claims17

Dependent claims

A calibration system for an automatic transmission of a vehicle, the calibration system comprising:

an interface configured for communication with a controller of the vehicle, the controller being configured to control the transmission of the vehicle;
and
a computing system connected to the interface and configured to:
obtain a set of parameters for a modeled gear shift event of the transmission, the set of parameters being indicative of at least interactions between on-coming and off-going clutches of the transmission during the modeled gear shift event;
based on the set of parameters, model forward/aft vehicle acceleration caused by the modeled gear shift event;
using a shift quality rating system, determine a shift quality rating of the modeled gear shift event based on at least one of the set of parameters and the modeled forward/aft vehicle acceleration;
determine whether the determined shift quality rating satisfies a shift quality rating threshold;
and
when the determined shift quality rating satisfies the shift quality rating threshold, calibrate, via the interface, at least one of clutch torque and slip profiles for controlling on-coming and off-going clutches of the transmission during gear shift events based on the set of parameters for the modeled shift event.

6 more elements

A simulation system for modeling gear shift events of a simulated automatic transmission of a simulated vehicle, the simulation system comprising:

a shift quality rating system configured to determine a shift quality rating of a modeled gear shift event of the transmission;
and
a computing system configured to perform a simulation process to model a gear shift event of the transmission, the simulation process comprising:
obtaining, from a user, a set of parameters for the modeled gear shift event of the transmission, the set of parameters being indicative of at least interactions between on-coming and off-going clutches of the transmission during the modeled gear shift event and comprising at least a gear ratio gradient indicative of a slope or rate of change of the gear ratio of the transmission during an inertia phase of the modeled gear shift event;
based on the set of parameters, modeling forward/aft vehicle acceleration caused by the modeled gear shift event;
obtaining, from the shift quality rating system, a shift quality rating of the modeled gear shift event based on at least one of the set of parameters and the modeled forward/aft vehicle acceleration;
determining whether the determined shift quality rating satisfies a shift quality rating threshold;
and
when the determined shift quality rating fails to satisfy the shift quality rating threshold, adjusting the gear ratio gradient and repeating the simulation process until the determined shift quality rating satisfies the shift quality rating threshold.

6 more elements

Dependencies are inferred from the claim text.