TABLE OF CONTENTS In most hybrid vehicles, an Integrated Starter Generator (ISG) is used to work in conjunction with the engine to supply power and torque to the vehicle. The ISG helps start the engine as well as generate required electrical energy and replaces the engine flywheel. The hybrid system could work on 42 V or 300 V and is connected to a corresponding battery pack. Various controllers, such as the engine controller module (ECM), transmission control module (TCM), vehicle systems controller (VSC), integrator starter generator (ISG) and battery controllers are used to control respective subsystems in the vehicle. Figure 4.36 shows the general layout of major HEV subsystems required for hybridization.
Some of the systems are replaced to support the hybrid functionality. For regenerative braking, an electro-hydraulic brake (EHB) system is added to the vehicle. A newly designed instrument cluster that provides additional information to the driver and status of hybrid sub-systems is integrated in the vehicle. A drive-by-wire system, i.e. electronic throttle control, replaces the mechanical throttle body (MTB).
The hybridization process adds several new components, such as vacuum pump, cabin heat pump, hybrid a/c, electric power assisted steering (EPAS), a cooling pump for the respective controllers and a battery cooling fan. These components are required in the vehicle to maintain production transparency of vehicle functions during various modes of driving, such as engine shut-off and vehicle run condition as well as the normal engine run condition.
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