Reduction of Cranking Noise from High Voltage Starter for One-Motor Two-Clutch Hybrid Systems

Paper #:
  • 2017-01-1167

Published:
  • 2017-03-28
Abstract:
DENSO CORPORATION's policy is to contribute to society focusing on environment, security & safety. Based on the environmental policy, we develop and produce various components for the electrification vehicles such as HEV and PHEV as tier 1 supplier For further CO2 reduction in the future, the penetration of these electrification vehicles must be important. Then the improvement of fuel efficiency and cost reduction are significant. In this paper, we propose the high voltage brushless AC starter that contributes to improve fuel efficiency and reduce the system cost of 1 motor 2 clutches hybrid system. We have named it HEV-starter which is composed the AC motor, inverter and pinion with shift mechanism. One of the issues of 1 motor 2 clutch system is high electrical energy at ICE starting when it switches over from EV driving to HEV driving. While ICE starting, the main-motor has to crank the ICE through the clutch, then the slip of clutch losses the main-motor power, so the main-motor has to output the high power to overcome the loss. Therefore, to contribute electrical power reduction by eliminate the clutch slip loss, HEV-starter as the dedicated ICE starter has been developed Thanks to electrical power reduction, HEV-starter is able to improve fuel efficiency and system cost reduction. However, the major issue is cranking noise due to pinion mechanism of starter. In order to solve the issue, we have developed the noise control strategy. The concept is to reduce the dependency of pinion operation of the starter. We aim at utilizing ICE inertia energy in the later cranking process instead of the pinion engagement. Using HEV starter feature which is the high power and controllable AC motor, we have achieved to control the cranking noise by the target level which is the road noise at EV driving.
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