Abstract
Automatic clutch engagement control is essential for all kinds of vehicle power transmissions. The controllers for vehicle power transmissions may include model-based or model-free approaches and must provide high transmission efficiency, fast engagement and low jerk. Most vehicle automatic transmissions are using torque converters with transmission efficiencies up to 96%. This paper presents the use of fuzzy logic control for a dry clutch in parallel hybrid electric vehicles. This controller can minimize the loss of power transmission since it can offer a higher transmission efficiency, up to 99%, with faster engagement, lower jerk and, thus, higher driving comfortability with lower cost. Fuzzy logic control is one of the model-free schemes. It can be combined with AI algorithms, neuro networks and virtual reality technologies in future development. Fuzzy logic control can avoid the complex modelling while maintaining the system’s high stability amid uncertainties and imprecise information. Experiments show that fuzzy logic can reduce the clutch slip and vibration. The new system provides 2% faster engagement speed than the torque converter and eliminates 70% of noise and vibration less than the manual transmission clutch.
Highlights
Hybrid electric vehicles (HEVs) and plug-in hybrid electric vehicles (PHEVs) are rapidly popularizing due to the world commitment to reduce fossil fuels and CO2 emissions
This is a sedan middle class parallel hybrid electric vehicle. This HEV consists of one internal combustion engine (ICE) of four cylinders with multiple point injection, volume of 2.4 L, max power of 156 kW at 6000 rpm, and the peak torque of 265 Nm; one electric motor starter (EM2) with max power of 8 kW and max torque of 43 Nm; the main electric motor (EM1) with max power of 35 kW and max torque of 205 Nm; the battery HEV Li-ion with capacity of 6.1 Ah; the transmission gear box with full automated six speed
The development of an engine start control method for P2 hybrid vehicles is considered in [17], where the pure electric motor switching to pure ICE mode is considered to prevent the driving torque variation at the time of the engine start
Summary
Hybrid electric vehicles (HEVs) and plug-in hybrid electric vehicles (PHEVs) are rapidly popularizing due to the world commitment to reduce fossil fuels and CO2 emissions. The development of an engine start control method for P2 hybrid vehicles is considered in [17], where the pure electric motor switching to pure ICE mode is considered to prevent the driving torque variation at the time of the engine start. The authors of [20] present a clutch control strategy of the driving mode transition for P2 HEV, where a model-based coordinated control strategy is developed. An engine clutch engagement control for HEV with a transmission mounted electric device is presented in [23] for fast synchronization of the engine and motor speed. The authors of [25] present the design, control and validation of two speed clutch for electric vehicle based on the coordinated control strategy to achieve the fast and smooth shifting. The layout of this paper is as follows: Section 2 presents modelling of clutch engagement; Section 3 develops fuzzy control schemes; Section 4 illustrate simulations; Section 5 presents experiments; and Section 6 is conclusion
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