FAQs

ADAS Service

EV Service

Tire Service

Auto Scanner

About EV

About Maintenance

• 71.

  Why high-voltage is used in EV?

  Electric vehicles (EVs) use high voltage for a variety of reasons, it helps improve various aspects of their performance and efficiency. Here are some key reasons for using high voltage systems in electric vehicles:
  ① Efficient power transmission: Power loss in electrical systems is proportional to the square of the current and inversely proportional to the voltage. By using higher voltages, electric vehicles can transmit power more efficiently. Lower current levels reduce resistive losses in cables and components, allowing for more efficient power transfer from the battery to the electric motor.
  
  ② Reduce current heating: Ohmic heating (I²R loss) in a conductor is directly related to the square of the current flowing through the conductor. Higher voltage allows electric vehicles to use lower current for the same power, thereby reducing heat in electrical components such as cables and connectors. This is particularly important to minimize energy losses and optimize the efficiency of the entire electric drivetrain.
  
  ③ Lighter and smaller components: Higher voltage brings lower current levels, thereby reducing heat and allowing the use of smaller and lighter electrical components. This includes cables, connectors and other components of the electric powertrain. Smaller, lighter components help reduce the overall weight of the vehicle and improve energy efficiency and range.
  ④ Power electronics efficiency: Power electronics (including inverters and converters) that control the flow of electrical energy between batteries and motors are generally more efficient at higher voltages. This increase in efficiency helps maximize electric drivetrain performance and ensure efficient power conversion.
  ⑤ Battery design: Higher voltage battery systems can be more efficient in terms of energy density and power output. Electric vehicle batteries are designed with multiple cells connected in series to achieve the required voltage level. This series connection allows for higher overall system voltage, thereby increasing electric vehicle performance and efficiency.
  
  ⑥ Fast charging capability: Higher voltage systems are usually associated with fast charging capabilities. Many fast charging stations provide high-voltage direct current to quickly charge electric vehicle batteries. The ability to accept higher voltages facilitates faster charging times, making electric vehicles more practical and convenient for users.
  
  In summary, using high voltage in electric vehicles helps improve efficiency, reduce power losses, make components smaller and lighter, and enable faster charging capabilities. Together, these factors improve the overall performance and survivability of electric vehicles compared to low-voltage systems.
  
• 72.

  What is EV sensor?

  In electric vehicles, "EV sensors" can refer to various sensors used in electric vehicles. Electric vehicles often utilize sensors to monitor battery status, manage energy efficiency, control motor performance and ensure overall safety, among other purposes. Examples of sensors in electric vehicles include battery temperature sensors, current sensors, voltage sensors, and position sensors for motors and other components.
• 73.

  What is the downside of hybrid cars?

  While hybrid cars offer a variety of advantages, they also have some disadvantages that potential buyers should consider. Here are some common disadvantages of hybrid cars:
  ① Initial cost: Hybrid cars generally have higher upfront costs than traditional gasoline cars. This is largely due to the additional technology, including electric motors and batteries, which can be expensive to manufacture.
  ② Complexity and maintenance costs: Hybrid vehicles have a more complex transmission system, including an internal combustion engine and an electric motor. Maintenance and repair costs for hybrid systems can be higher than for traditional vehicles and may require specialized training for technicians.
  ③ Limited pure electric driving range (for non-plug-in hybrid vehicles): Traditional hybrid vehicles (non-plug-in hybrid vehicles) rely on regenerative braking and the internal combustion engine to charge the battery. They typically have limited electric-only range and cannot be plugged into an external power source for charging. This may limit their ability to run solely on electricity for extended periods of time.
  
  ④ Battery replacement cost: The hybrid battery is an important part of the vehicle, and its replacement cost may be high. While hybrid batteries are becoming more durable and manufacturers often offer warranties, the cost of new batteries remains a concern for some buyers.
  ⑤ Weight and cargo space: Hybrid vehicles are generally heavier than non-hybrid vehicles due to the increased weight of the battery. This may affect the vehicle's handling and may reduce cargo space on some models.
  ⑥ Dependence on gasoline: Although hybrid vehicles are designed to improve fuel efficiency, they still rely on gasoline. This means they are not completely emission-free and their overall environmental impact depends on the energy mix used to generate electricity and the fuel efficiency of the vehicle.
  ⑦ Charging infrastructure (for plug-in hybrid vehicles): Plug-in hybrid electric vehicles (PHEV) have pure electric driving range and can be extended by charging from an external power source. However, the availability and convenience of charging infrastructure may vary, and vehicle owners may face challenges finding suitable charging stations, especially in certain areas.
  
• 74.

  What car has both an electric and gasoline motor?

  Many cars have both an electric motor and a gasoline engine, and these vehicles are often called hybrids. There are two main types of hybrid cars:
  
  

  Conventional Hybrid (HEV): These hybrids use an internal combustion engine (usually gasoline) and an electric motor to propel the vehicle. The electric motor assists the engine during acceleration and other high power demand situations. It also acts as a generator during braking, converting kinetic energy back into electrical energy to charge the battery.

  
  

  Plug-in Hybrid Electric Vehicles (PHEV): Plug-in hybrid electric vehicles have larger batteries than traditional hybrid vehicles and can be charged externally, usually through a wall socket or charging station. They operate in pure electric mode within a certain range before the combustion engine starts. The petrol engine can also help under hard acceleration or when the battery is drained.
  
• 75.

  Is A plug-in hybrid better than a hybrid?

  The choice between a plug-in hybrid (PHEV) and a conventional hybrid depends on your specific needs, driving habits and priorities. Both types of vehicles have their advantages and disadvantages, and the choice that's more suitable for you will depend on your personal circumstances. Here are some key factors to consider:

  ① Electric-Only Range:
  Hybrid: Traditional hybrids use a combination of an internal combustion engine and an electric motor, but they don't have a plug-in option. They generate electricity through regenerative braking and the internal combustion engine.
  
  PHEV: Plug-in hybrid vehicles have larger batteries that can be charged using an external power source. This allows them to operate in pure electric mode within a certain range before the internal combustion engine kicks in. If your daily commute is short and you have access to charging infrastructure, a plug-in hybrid allows you to drive most of your miles on electric power.
  
  ② Fuel efficiency:
  Hybrid: Conventional hybrid vehicles are generally more fuel-efficient than conventional internal combustion engine vehicles because they use electricity at low speeds and in certain driving conditions.
  Plug-in hybrids: Plug-in hybrids may be more fuel-efficient than traditional hybrids, especially if you have a short commute and can charge the vehicle regularly. However, if you regularly drive long distances without charging, the advantages may diminish.
  
  ③ Charging infrastructure:
  Hybrid: Traditional hybrid vehicles require no external charging because they generate electricity through regenerative braking and an internal combustion engine.
  Plug-in hybrid vehicles: Plug-in hybrid vehicles can take advantage of charging infrastructure to extend their all-electric driving range. If you can charge at home or work, a plug-in hybrid may be a good choice.
  
  ④ Cost:
  Hybrids: Conventional hybrids are generally cheaper than plug-in hybrids due to smaller battery sizes and simpler technology.
  Plug-in hybrids: Plug-in hybrids can have higher upfront costs due to larger batteries and additional electrical components. However, tax benefits and potential fuel savings may offset this cost difference over time.
  
  ⑤ Impact on the environment:
  Hybrid: Conventional hybrid vehicles are generally more fuel efficient and produce fewer emissions than traditional internal combustion engine vehicles, but they still rely on gasoline.
  

  Plug-in hybrids: Plug-in hybrids may be more environmentally friendly if they are charged using clean energy. Purely electric drive capability reduces overall emissions.

  
  

  In summary, whether a plug-in hybrid is better than a conventional hybrid depends on your specific needs, driving patterns and use of charging infrastructure. If your daily commute is short and you need to recharge regularly, a plug-in hybrid may offer the added benefit of electric-only driving and potential fuel savings. However, if you mainly drive long distances and don't have access to charging, a traditional hybrid may be a more practical option.