Vehicle surge reduction technology during towing in parallel HEV pickup trucks
2022-01-0733
03/29/2022
- Event
- Content
- In order to ensure the comfort of the parallel HEV pickup truck, this report proposes a vehicle surge reduction technology during towing that utilizes a motor and shifting. Hybridization is one of the approaches to reduce fuel consumption toward the realization of carbon neutrality. The parallel HEV is more advantageous to high-load operation such as towing and loading, which are often used in pickup trucks than the series parallel HEV represented by the Toyota Hybrid System. Since the parallel HEV has an engine, motor, torque converter, and transmission connected in series, a vehicle surge may occur when engaging the lockup clutch due to fuel efficiency and drivability needs, as with conventional powertrains. Vehicle surge is a low-frequency vibration phenomenon. In general, the applied force is the torque fluctuation caused by the engine and tires, and the amplification is the driveline torsional first-order resonance, suspension resonance, and cabin resonance. The vibration is more amplified during towing than not towing situation. Therefore, we propose two reduction technologies to achieve both fuel efficiency and comfort during towing. One is anti-vibration control that suppresses the relative vibration between the drive line and tires by effectively utilizing the hybrid motor. The other is shift control to avoid torsional resonance from the frequency of the applied force, which was realized by changing the equivalent inertia by selecting an appropriate gear stage.
- Citation
- Okaya, S., Kokaji, J., Quinteros, L., Hasegawa, Y. et al., "Vehicle surge reduction technology during towing in parallel HEV pickup trucks," SAE Technical Paper 2022-01-0733, 2022, .