JAC and Ricardo develop production version of HyBoost concept; seeking 30% boost in fuel economy with same performance
Anhui Jianghuai Automobile Group Co Ltd (JAC) and Ricardo are collaborating on a project to develop the Ricardo HyBoost concept (earlier post)—a combination of low-cost technologies to deliver improved performance and fuel economy which featured recently in the Ricardo Centenary celebrations —into volume production on a JAC vehicle.
The Ricardo HyBoost concept is based on a downsized, highly boosted turbocharged direct injection gasoline (TDGI) engine giving improved fuel economy at low cost, linked to a 48V electrical architecture including a belt starter generator (BSG), DC-DC converter and a lithium-ion battery for energy storage.
The BSG provides highly efficient generation of electricity for vehicle on-board use, including short-duration absorption of mechanical power during vehicle deceleration in the form of regenerative braking. It also enables re-starting of the engine after stopping, as part of an intelligent in-gear engine start/stop strategy.
The BSG also provides torque assistance to the engine to improve overall fuel economy. In addition, a 48V electric supercharger has also been evaluated during the concept phase, demonstrating beneficial low-speed torque augmentation and improved response.
The HyBoost collaboration between JAC and Ricardo commenced mid-2014 and has already successfully passed its mule vehicle development gateway, a major decision event for the program. The project team is now working to productionize the HyBoost concept for a JAC vehicle intended for launch in the Chinese market. This launch vehicle replaces the 2.0L MPFI engine with a downsized gasoline 1.5L TGDI unit and couples it with the 48V electrical system.
With this combination of technologies, JAC and Ricardo are aiming for a fuel economy improvement of in the region of 30% in comparison with current technology but with zero degradation of vehicle performance.
NEDC testing undertaken on the JAC mule vehicle during the concept phase of the program has served to verify the fuel economy targets are achievable without compromising driveability. NVH has been an area of focus in the development of engine mounting strategies. The collaboration is also extending to the detailed development of control strategies and software as part of the necessary powertrain systems validation.