Patent ID: 11873777
Assignee: HYUNDAI KEFICO CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 0:
1. A start-up method for a mild hybrid system, comprising:
(a) determining that a start-up is attempted through a Mild Hybrid Starter and Generator (MHSG) of the mild hybrid system in accordance with a request for the start-up from a driver;
(b) comparing an engine rpm at an end of cranking for the start-up with a preset reference rpm using the MHSG;
determining that the engine rpm at the end of cranking exceeds the preset reference rpm in the comparison of (b);
(c) determining that an engine rpm immediately after the start-up follows an idle target rpm;
(d) determining poor following, in which the engine rpm immediately after the start-up does not follow the target rpm, is generated, and determining there is an error in a cam angle sensor when the poor following, is generated;
(e) changing an engine state into a cranking state when the error is found in the cam angle sensor;
(f) executing an existing backup crank logic that decreases a target rpm of the MHSG and finds out a fuel injection time while performing a test injection using a signal from a crank angle sensor when the engine state is changed into the cranking state; and
(g) determining whether the engine state has entered a normal run state.