Trystan Casey
Electric auxiliary controls in a vehicle are an essential part of the driving experience. They include the indicators, hazard warning lights, windscreen wipers and washers, vehicle lights, and window demisters. In electric vehicles, the battery energy is primarily used for traction, with only a small portion powering auxiliary systems. Vehicle Control Units (VCUs) are central management systems that oversee and regulate essential functions like motor management, battery supervision, and energy efficiency. They are critical in the development and performance of electric vehicles, ensuring efficiency, safety, and user-friendliness. VCUs also accommodate auxiliary systems like air conditioning and power steering. Electric auxiliary controls are typically covered during the first driving lesson, along with hand and foot controls, to ensure safe driving.
Characteristics and Values of Electric Auxiliary Controls in a Vehicle
| Characteristics | Values |
|---|---|
| Hand Controls | Steering wheel, gear selector lever, handbrake or parking brake |
| Foot Controls | Accelerator, brake |
| Auxiliary Controls | Indicators, hazard warning lights, windscreen wipers and washers, vehicle lights, window demister |
| Auxiliary Systems | Power steering, air conditioning, DC-DC converter, auxiliary battery, auxiliary pump, voltage conversion system, auxiliary brake system, drive control system, vehicle control system |
| Vehicle Control Unit Functions | Motor management, battery supervision, energy efficiency, battery usage and energy regeneration, smooth operation of electric drivetrains, supporting ADAS |
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What You'll Learn
Electric Vehicle Auxiliary Systems and Energy Consumption
Electric vehicles (EVs) are rising in popularity, and the automotive industry is at a pivotal point in its history, marked by the rapid ascent of EVs and the decline of traditional internal combustion engines (ICEs). This shift is not just about the type of energy used to power vehicles but also a transformation in how vehicles themselves are conceptualized, designed, and integrated with the broader technological ecosystem.
The electrification of vehicles brings about new challenges and opportunities for car manufacturers and consumers alike. One critical aspect of EVs is the role of auxiliary systems and their impact on energy consumption. Auxiliary systems refer to the various components and functions in a vehicle that support the primary function of propulsion. These include systems such as lighting, indicators, hazard warning lights, windscreen wipers, vehicle lights, window demisters, power steering, air conditioning, and more.
In battery-powered electric vehicles (BEVs), the majority of the battery energy should be spent on traction, with only a minor part used for powering auxiliary systems. This is an important consideration for car manufacturers when designing efficient EVs. The energy consumption of auxiliary systems can vary depending on driving conditions and external factors. For example, during summer, energy consumption by auxiliary systems, especially air conditioning, can represent around 50% of the total energy consumed in electric buses. Similarly, in West Los Angeles, a case study found that an in-wheel motor-driven autonomous electric vehicle saved up to 17.5% of energy compared to a conventional electric vehicle during slope driving.
To optimize energy efficiency, some measures can be taken to reduce the energy consumption of auxiliary systems. For instance, using LED lights instead of classic light bulbs can significantly reduce energy consumption. Additionally, the use of a separate 12-volt battery can simplify the electrical requirements of the vehicle and reduce the load on the primary battery. This is especially useful for vehicles that are infrequently driven and spend long periods at rest.
The Vehicle Control Unit (VCU) plays a crucial role in managing auxiliary systems and energy consumption in EVs. VCUs act as central management systems, overseeing essential functions like motor management, battery supervision, and energy efficiency. They ensure the smooth operation of electric drivetrains and support advanced driver-assistance systems (ADAS). By coordinating between various subsystems, VCUs improve vehicle performance, efficiency, safety, and user-friendliness.
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Auxiliary Battery and Power Supply
Electric auxiliary controls in a vehicle include the indicators, hazard warning lights, windscreen wipers and washers, vehicle lights, window demister, steering wheel, gear selector lever, and the handbrake or parking brake. These are essential for driving safely.
The auxiliary battery is an important configuration in modern cars, especially in high-end models equipped with many electronic devices and technologies. It is a secondary car battery that powers certain electrical components even when the engine is off. Vans and pickups built with a camper package will have an auxiliary battery to power the lights in the camper. Similarly, bobtail box trucks equipped with 12-volt lights and accessories in the box part of the truck that are routinely used for extended periods also have an auxiliary battery to power those units.
The auxiliary battery is usually a 12V battery, but it is the backbone unit of the system, supporting the normal operation of the vehicle. It is responsible for the power supply of non-power power sources, such as entertainment systems, doors and windows, and lighting systems. It is also used as a safety backup to support the main battery when required or to provide constant voltage for specific vehicle systems. The auxiliary battery in an electric vehicle (EV) serves many functions but differs from the main lithium-ion battery that runs an EV's motor.
In a conventional system (non-hybrid, non-EV) with a primary and auxiliary battery, the auxiliary battery supplies power to certain electrical components that would drain the primary battery and cause a no-start situation if used for an extended period. The auxiliary battery on non-EV or hybrid vehicles usually operates in an isolated circuit upon engine startup. However, on hybrids and EVs, the 12-volt battery is charged when the main battery's contactors are engaged through the DC-to-DC converter. If the 12-volt battery on a hybrid or EV is dead, the contactors that energize the main high-voltage battery won't close.
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Electric Vehicle Auxiliary Controls and Driving
Electric vehicles (EVs) are rising in popularity, and with that, the role of Vehicle Control Units (VCUs) is becoming more prominent. VCUs are central management systems within EVs that oversee and regulate essential functions like motor management, battery supervision, and energy efficiency. They are critical in making electric vehicles more efficient, safe, and user-friendly.
VCUs are distinct from traditional Engine Control Units (ECUs) found in combustion engine vehicles. While ECUs primarily focus on managing engine performance and emissions, VCUs in EV powertrains engage in a more complex set of tasks due to the higher number of electrical components. VCUs regulate battery usage, energy regeneration, the operation of electric drivetrains, and advanced driver-assistance systems (ADAS). They also communicate with other vehicle systems, enhancing overall performance and efficiency.
The role of VCUs is particularly important when it comes to auxiliary systems and controls in electric vehicles. Auxiliary systems refer to the additional components in a vehicle that support its primary functions. In the context of electric vehicles, auxiliary systems include power steering, air conditioning, heating, and lighting. These systems are essential for the overall functionality, comfort, and safety of the vehicle.
Optimising the energy consumption of auxiliary systems is crucial in electric vehicles. Since these vehicles are powered by batteries, it is important to allocate energy efficiently. Most of the battery energy should be spent on traction, with only a minor portion used for powering auxiliary systems. This balance ensures that the vehicle can operate effectively while also providing a comfortable and safe environment for the occupants.
Auxiliary controls in a vehicle refer to the indicators, hazard warning lights, windscreen wipers and washers, vehicle lights, and window demisters. These controls are typically covered during the initial stages of learning to drive, as they are essential for driving safely and are often part of the driving test. Understanding these auxiliary controls is crucial for every driver, regardless of the type of vehicle they operate.
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Vehicle Control Units (VCUs)
Electric auxiliary controls in a vehicle refer to the hand, foot, and auxiliary controls essential for driving safely. These include the steering wheel, gear selector lever, and the handbrake or parking brake. Auxiliary controls also encompass indicators, hazard warning lights, windscreen wipers, washers, vehicle lights, and the window demister.
One of the key roles of VCUs is to centralize control functions, integrating various powertrain components that were traditionally handled by separate units in combustion engine vehicles. This integration enables VCUs to manage the coordination of different subsystems, ensuring efficient and smooth operation. For example, VCUs regulate battery usage and energy regeneration, optimize vehicle handling and response, and support advanced driver assistance systems (ADAS) for enhanced safety.
VCUs are also essential in enabling connected vehicle features. As vehicles become increasingly integrated with digital networks, VCUs facilitate over-the-air updates, real-time diagnostics, and enhanced cybersecurity measures. This connectivity ensures the longevity, safety, and relevance of electric vehicles in a rapidly evolving landscape of e-mobility.
The choice of VCU depends on the vehicle's application and requirements. Different types of VCUs are available, such as the standard mid and standard max versions, and they can be adapted to suit specific needs, like high processing power and integration capabilities for electric cargo vehicles. The design of VCUs is focused on creating robust and adaptive systems that enable dynamic and steady-state performance improvements.
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Auxiliary Systems Installation Structure
Electric auxiliary controls in a vehicle are systems that support the primary functions of the vehicle. They include systems like air conditioning and power steering.
The overall auxiliary system installation structure of an electric vehicle cabin provides a compact and reasonable structure that is easy to install. It addresses the issue of scattered auxiliary systems in the prior art, which occupy a large amount of car body space and have a loose overall structure, making the installation and maintenance processes cumbersome. The support in the front cabin of the electric vehicle is movably connected to the corresponding car body, allowing for the integral installation of the auxiliary system.
The auxiliary systems that can be installed in the front cabin include:
- An auxiliary power supply system
- A voltage conversion system
- An auxiliary brake system
- A drive control system
- An air conditioning system
- A vehicle control system
The voltage conversion system is an important aspect of the auxiliary systems installation structure. In electric vehicles, a 12-volt battery is typically used to satisfy the basic electrical requirements of the vehicle. This allows for the use of a small capacity DC-DC converter, which can be charged through the converter when the vehicle is in operation.
The heating system is another important consideration in the auxiliary systems installation structure. In a typical ICE (internal combustion engine) heater, waste heat from the engine cooling system is used to warm the fluid circulated through the heater. In an electric vehicle conversion, a ceramic resistance heater is often used to replace the water radiator (heater core). This requires careful installation to avoid creating a fire or shock hazard, and a heavy-duty relay is needed for power control.
The vehicle control system, or VCU (Vehicle Control Unit), is another critical component of the auxiliary systems installation structure. VCUs act as central management systems in electric vehicles, overseeing and regulating essential functions like motor management, battery supervision, and energy efficiency. They also coordinate between various subsystems, ensuring that electric vehicles meet expectations regarding performance, reliability, and sustainability.
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Frequently asked questions
Electric auxiliary controls in a vehicle are powered by electricity and include the indicators, hazard warning lights, windscreen wipers and washers, vehicle lights, and window demister.
Electric auxiliary systems in a vehicle include the power steering, air conditioning, braking, and voltage conversion systems.
Electric auxiliary controls refer to the individual components that can be operated by the driver, such as the indicators or windscreen wipers. Electric auxiliary systems, on the other hand, refer to the broader systems that encompass multiple components, such as the power steering or air conditioning systems.
In BEVs, the majority of the battery energy should be spent on traction, with only a minor portion used for powering auxiliary systems. This is because the energy for these systems comes from the power grid, so excessive use of auxiliary systems can lead to high energy consumption.
