Technician A states that an advantage of a parallel hydraulic hybrid (PHH) drive system is that a small bore ICE can be used in place of a larger one. Technician B states that a PHH system can only impart hydraulic drive torque, so that in the event of a leak, the vehicle would be crippled. Who is correct?

Question

Quizplus · Accepted Answer

Technician A is correct because a parallel hydraulic hybrid system allows for a smaller internal combustion engine (ICE) to be used by supplementing the engine's power with hydraulic power, thus reducing the need for a larger engine. Technician B is incorrect because a PHH system can provide both hydraulic and mechanical drive torque, meaning the vehicle can still operate even if there's a hydraulic leak, though perhaps with reduced efficiency.

Technician a States That an Advantage of a Parallel Hydraulic