Hybrid Book - Chapter 10

The coolant pump of the Toyota Prius electric propulsion system is driven by a 12V electric pump. This means that the pump is powered by a 12V electrical system in the vehicle. The coolant pump is responsible for circulating coolant through the system to regulate the temperature and prevent overheating. Using an electric pump allows for efficient and precise control of coolant flow, ensuring optimal performance and temperature management in the electric propulsion system.

The correct answer is MG1. In the Toyota Prius electric transaxle, the cranking motor is referred to as MG1. This acronym stands for Motor Generator 1, indicating that this motor serves both as a generator to charge the hybrid battery and as a motor to assist the gasoline engine during acceleration. MG1 plays a crucial role in the hybrid system of the Toyota Prius, contributing to its overall efficiency and performance.

The correct answer is MG2. In the Toyota Prius electric transaxle, MG2 refers to the drive motor. This motor is responsible for providing the primary power to propel the vehicle forward. It works in conjunction with MG1, which is the generator motor, to efficiently manage power distribution and charging of the hybrid battery. MG2 is an essential component of the hybrid system in the Toyota Prius, allowing for smooth and efficient operation of the vehicle.

The Toyota Prius electric transaxle contains one planetary gear set.

The Toyota Prius generator MG2 is connected directly to the drive chain gear. This means that the generator is directly linked to the gear that drives the chain, which in turn drives the wheels of the car. This direct connection allows for efficient transfer of power from the generator to the wheels, ensuring smooth operation and optimal performance of the vehicle.

The Toyota Prius engine is connected to the electric transaxle through the transaxle damper assembly. This assembly helps to dampen vibrations and shocks that occur during the operation of the engine and transaxle. It provides a smooth and stable connection between the two components, ensuring efficient power transfer and reducing wear and tear on the drivetrain. The use of a transaxle damper assembly is common in hybrid vehicles like the Prius, where the engine and electric motor work together to power the vehicle.

The Toyota Prius generator MG1 is connected directly to the sun gear. The sun gear is a central gear in a planetary gear set that is responsible for transmitting power in the transmission system. In the case of the Toyota Prius, the sun gear is directly connected to the generator MG1, allowing it to generate electricity as the vehicle moves. This arrangement ensures efficient power generation and distribution within the hybrid system.

MG1 controls the infinite gear ratio in the Toyota Prius electric transaxle. MG1, also known as the Motor Generator 1, is responsible for generating electrical power and is connected to the engine. It controls the speed and torque of the engine, allowing for smooth transitions between different gear ratios. This helps optimize the efficiency and performance of the hybrid system in the Toyota Prius.