Methods and systems for engine cranking
First Claim
Patent Images
1. A method of starting an engine, comprising:
- starting the engine via a first electrical machine when a desired torque demand is less than a first threshold amount;
starting the engine via a second electrical machine when the desired torque demand is greater than the first threshold amount;
supplying torque sufficient to rotate vehicle wheels solely via the first electrical machine during selected operating conditions; and
decoupling the second electrical machine from the engine when engine speed reaches a threshold speed.
1 Assignment
0 Petitions
Accused Products
Abstract
Systems and methods for improving operation of a hybrid vehicle are presented. In one example, an engine may be started in one of two ways depending on operating conditions. In particular, the engine may be started via a lower power output electric machine or a higher power output electric machine.
44 Citations
11 Claims
-
1. A method of starting an engine, comprising:
-
starting the engine via a first electrical machine when a desired torque demand is less than a first threshold amount; starting the engine via a second electrical machine when the desired torque demand is greater than the first threshold amount; supplying torque sufficient to rotate vehicle wheels solely via the first electrical machine during selected operating conditions; and decoupling the second electrical machine from the engine when engine speed reaches a threshold speed. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of starting an engine, comprising:
-
starting the engine via a first electrical machine when a desired torque demand is less than a first threshold amount that varies with speed of the first electrical machine; starting the engine via a second electrical machine when the desired torque demand is greater than the first threshold amount; and supplying torque sufficient to rotate vehicle wheels solely via the first electrical machine during selected operating conditions.
-
-
7. A hybrid vehicle system, comprising:
-
an engine; a starter selectively engaged to the engine and including a pinion gear; a dual mass flywheel (DMF) including a first side mechanically coupled to the engine; a driveline disconnect clutch mechanically including a first side coupled to a second side of the dual mass flywheel; a driveline integrated starter/generator (DISG) including a first side coupled to a second side of the driveline disconnect clutch; and a controller including non-transitory instructions executable to start the engine via the starter during a first start and via the DISG during a second start and where the engine is started by rotating the engine via the DISG, further comprising additional instructions to decouple the DISG from the engine after a predetermined number of combustion events. - View Dependent Claims (8, 9, 10, 11)
-
Specification