| US 7,350,602 B2 | ||
| System and method for engine start detection for hybrid vehicles | ||
| Dan Colvin, Farmington Hills, Mich. (US); Walt Ortmann, Saline, Mich. (US); Marvin Kraska, Dearborn, Mich. (US); Kathleen Bailey, Dearborn, Mich. (US); Mark Yamazaki, Canton, Mich. (US); and Brandon Masterson, Whitmore Lake, Mich. (US) | ||
| Assigned to Ford Global Technologies, LLC, Dearborn, Mich. (US) | ||
| Filed on Jul. 19, 2004, as Appl. No. 10/710,530. | ||
| Prior Publication US 2006/0011394 A1, Jan. 19, 2006 | ||
| Int. Cl. B60K 6/02 (2006.01) | ||
| U.S. Cl. 180—65.2 [903/941] | 12 Claims |
| 1. A method for operating a hybrid vehicle having a primary power generating system and a secondary power generating system
coupled via a power transmission assembly for delivery of tractive force for the vehicle, the method comprising:
determining acceleration of input speed to the power transmission assembly when the primary power generating system is deactivated;
and
inferring activation of the primary power generating system based at least in part on the acceleration of the power transmission
assembly,
wherein the primary power generating system comprises an internal combustion engine, the secondary power generating system
comprises an electric machine that performs as a motor in one mode of operation, and performs as a generator in another mode
of operation:
operating the hybrid vehicle comprises engine start detection and activation of the primary power generating system comprises
engine start;
determining acceleration of input speed to the power transmission assembly comprises determining a transmission input speed,
filtering the transmission input speed, determining a derivative of the filtered transmission input speed, and filtering the
derivative of the filtered transmission input speed; and
inferring activation of the primary power generating system comprises determining an engine speed and a transmission input
torque;
generating a first trigger signal when the filtered derivative of the filtered transmission input speed is greater than a
first predetermined acceleration for a first predetermined time;
generating a second trigger signal when the engine speed is greater than a second predetermined speed;
generating a third trigger signal when the transmission input torque is greater than a predetermined torque level; and
asserting an engine start signal when the first, second, and third trigger signals are substantially simultaneously generated.
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