11 Questions
What type of batteries are typically used in vehicles with integrated starter generator units?
Lithium-ion
What is the operating voltage of micro-hybrid stop-start systems?
12 volts
Which system was the most common early stop-start system?
Belt alternator starter (BAS
What type of battery can the high-voltage battery be in hybrid stop-start systems?
Lithium-ion
What is the purpose of ultracapacitors in stop-start systems?
To deliver a quick burst of energy during peak power demands
What can disable the stop-start system?
Open doors
What modules are used to operate stop-start systems?
All of the above
What type of vehicles can utilize stop-start systems?
Both automatic and manual transmission equipped vehicles
What type of stop-start system operates on a voltage greater than normal system voltage?
Mild hybrid
What is the purpose of the inverter and converter in hybrid stop-start systems?
To convert voltage for the system
What is the purpose of the hybrid control module in hybrid stop-start systems?
To control the electric portion of the powertrain
Study Notes
- 36-48-volt batteries are used to drive integrated starter generator units on certain vehicles.
- These batteries are typically lithium-ion and can be integrated into a single module with other components.
- Diagnosis of these batteries depends on the design, with early designs using multiple 12-volt lead-acid batteries while newer designs rely on the hybrid or battery control module.
- Stop-start systems can be categorized as mild or micro hybrids based on their design and operating voltage.
- The belt alternator starter (BAS) system was the most common early stop-start system.
- Micro-hybrids utilize a stop-start system that operates on a 12-volt system and does not contain any high-voltage components.
- Various modules and enhanced components are used to operate these systems, including the engine control module, transmission control module, intelligent battery sensor module, and body control module.
- Manual transmission equipped vehicles can also utilize stop-start systems.
- Heavy-duty starters and two batteries (primary and auxiliary) are typically used in stop-start systems.
- Ultracapacitors may also be used to deliver a quick burst of energy during peak power demands.
- Stop-start systems automatically shut off the engine when the vehicle is stationary to save fuel and reduce emissions.
- The 12-volt system maintains vehicle operation during the engine off period.
- Safety conditions, such as open doors or unbuckled seat belts, can disable the stop-start system.
- Diagnostic trouble codes associated with the system can refer to issues with various components.
- Mild hybrid stop-start systems operate on a voltage greater than normal system voltage.
- The high-voltage battery can be nickel metal hydride or lithium-ion construction and is typically located under or behind a seat.
- The electric motor can be used to start the engine and recharge the high-voltage battery.
- The inverter and converter are used to convert and step down voltage for the system.
- The ECM controls engine control systems while the hybrid control module controls the electric portion of the powertrain.
- High-voltage safety precautions must be followed when servicing high-voltage components.
Test your knowledge on the complex world of stop-start systems and 36-48-volt batteries used in certain vehicles with this informative quiz. From the newest lithium-ion designs to the traditional lead-acid batteries, learn about the components and modules that drive these systems and enhance their efficiency. Discover how safety conditions, such as open doors or unbuckled seat belts, can disable stop-start systems and how ultracapacitors deliver quick bursts of energy during peak power demands. Challenge yourself and gain insights
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