11 Questions
What is the gear ratio split in the Toyota/Lexus power-split device drive system?
72% to the ring gear and 28% to the sun gear
What is used to recharge the HV battery in the Toyota/Lexus power-split device drive system?
Power generated by MG1
What is the purpose of the electrically actuated parking lock mechanism in the Toyota/Lexus power-split device drive system?
To engage the transmission in park
What is the recommended method for refilling the inverter cooling system in the Toyota/Lexus power-split device drive system?
Using an airlift fluid exchange machine
What should be checked when diagnosing HEV transmission concerns?
The fluid level and condition
What type of transmission do most electric vehicles use?
Single-speed transmission
How does conversion efficiency affect range in electric vehicles?
Every 1% increase in conversion efficiency translates to 2% more range
What components are included in BorgWarner's iDM?
Electric motor, gearbox, thermal-management system, and power electronics
What is included in Chevrolet Bolt's drive unit?
Electric motor, final drive assembly, and transmission fluid
What components are included in Nissan Leaf's powertrain?
Electric motor, resolver, and reducer for torque transfer
What is the purpose of the reducer in Nissan Leaf's powertrain?
To minimize energy loss due to friction
Study Notes
- Toyota/Lexus power-split device drive system is used in multiple models.
- The system is a series-parallel hybrid technology with a single planetary gear set and two electric motor/generators.
- The gear ratio splits 72% of torque to the ring gear and 28% to the sun gear.
- Power generated by MG1 is either directed to MG2 to help move the vehicle or is used to recharge the HV battery, if necessary.
- The system does not use a conventional clutch or torque converter.
- The transaxle oil and inverter coolant need to be changed at specified intervals.
- A cable-operated parking lock mechanism was replaced with an electrically actuated mechanism starting with the 2004 model year.
- Always use the recommended fluids and procedures when servicing any vehicle.
- The fastest and most reliable way to refill the inverter cooling system is to use an airlift fluid exchange machine.
- When diagnosing HEV transmission concerns, verify the customer complaint and check the fluid level and condition.
- Steps for diagnosing transmission issues include checking for DTCs, TSBs, scan tool data, visual inspections, and bidirectional control.
- Most electric vehicles use a single-speed transmission for optimum low-end acceleration.
- Conversion efficiency affects range, with every 1% increase translating to 2% more range.
- BorgWarner's iDM is a compact assembly with an electric motor, single-speed gearbox, thermal-management system, and power electronics.
- Chevrolet Bolt's drive unit consists of an electric motor, final drive assembly, and Dexron HP transmission fluid.
- Nissan Leaf's powertrain includes a three-phase AC electric motor, resolver, and reducer for torque transfer.
- The reducer minimizes energy loss due to friction and requires periodic oil level inspections.
- Neutral in electric vehicles disconnects power to the motor, but the motor is never fully disconnected.
Think you know your stuff when it comes to hybrid and electric vehicle transmissions? Test your knowledge with this quiz! From the Toyota/Lexus power-split device drive system to the BorgWarner iDM and Chevrolet Bolt's drive unit, this quiz covers everything from gear ratios to fluid maintenance. Keywords include hybrid, electric vehicle, transmission, power-split device, planetary gear set, electric motor, fluid maintenance, and more.
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