Trystan Casey
The electrical architecture of a vehicle refers to the structured configuration of all its electronic components, modules, and networks. It defines the electrical and electronic composition of the vehicle, including the electronic hardware, network communications system, software, and wiring of all the circuits. The design of the electrical architecture is crucial to enhancing control over the functionality of the vehicle. With the increasing electrification of vehicles and the rise of electric vehicles (EVs), the design of automotive networks and software development has become more challenging. A well-designed architecture promotes reliability, safety, and efficiency through reduced energy consumption, weight, and costs.
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What You'll Learn
Electric vehicle architecture
The architecture of an electric vehicle (EV) is complex and sophisticated, integrating cutting-edge technology to transform the driving experience. At its core is the battery, a rechargeable, high-voltage energy storage system that powers the electric motor. The battery is typically positioned low in the body floor, providing a low centre of gravity and improving the vehicle's stability. The battery system used for traction, the electric motor, the power regulation circuits, and those dedicated to battery charging are all fundamental aspects of EV architecture.
EVs also feature a charging port that allows them to connect to external power sources for recharging. The onboard charger converts alternating current (AC) from the charging source into direct current (DC) to charge the battery. Additionally, a high-voltage DC-DC converter is used to supply lower-voltage DC power for various vehicle systems, including lighting, entertainment, and air conditioning.
The vehicle controller or electronic control unit (ECU) is the "brain" of the vehicle, controlling essential functions like engine performance, power steering, and safety and comfort features. The vehicle control unit facilitates internal communications between various systems, enabling them when required. Another key component is the battery management system (BMS), which monitors the battery's state of charge, state of health, and overall health, ensuring it operates within safe limits. It also protects against thermal runaway and overcharging by controlling the input current and disconnecting the battery when necessary.
EV architecture has evolved to improve efficiency and connectivity, integrating communication protocols such as CAN, LIN, FlexRay, and Ethernet. With the increased use of electronic components, well-designed architecture is crucial to promote reliability, safety, and efficiency through reduced energy consumption, weight, and costs.
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Electronic hardware
The term "vehicle electrical architecture" refers to the convergence of electronic hardware, network communications, software applications, and wiring into one integrated system. It is the structured configuration of all electronic components, modules, and networks within a vehicle that defines its electrical and electronic composition.
In addition to these basic components, electronic hardware in vehicle electrical architecture also includes more advanced elements such as the Battery Management System (BMS). The BMS plays a critical role in monitoring the battery's state of charge, state of health, and overall health. It ensures that the battery operates within safe limits, preventing issues like overcharging and thermal runaway. The BMS also manages thermal management, cell balancing, and communication within the battery system.
Furthermore, electronic hardware in vehicle electrical architecture can include user interface and display systems. These interfaces provide valuable information to the driver and passengers, such as battery status, range estimation, and charging details. Safety systems, such as airbags, anti-lock brakes, stability control, and collision avoidance mechanisms, are also integrated into the electronic hardware.
The design of electronic hardware in vehicle electrical architecture aims to enhance control over the vehicle's functionality and improve reliability, safety, and efficiency. With the increasing complexity of electronic systems in vehicles, well-designed architecture is essential to optimize performance and meet the power and data needs of various electrical devices.
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Software applications
The evolution of vehicle electrical architecture has been driven by the growing interaction between software and electronics, leading to revolutionary changes in how vehicle features are designed and experienced. This shift has also introduced new challenges, particularly regarding cybersecurity, as vehicles become increasingly vulnerable to cyber threats.
Additionally, the emergence of software-defined vehicles (SDVs) has further emphasized the importance of software in vehicle electrical architecture. SDVs rely on fewer, more consolidated computing hardware units capable of performing multiple tasks, similar to smartphones. This approach reduces costs, simplifies vehicle design, and unlocks the ability to add new capabilities over time.
Furthermore, modern software architectures enable vehicle manufacturers to extend connected services and offer powerful capabilities, either through in-car infotainment systems or dedicated vehicle apps. These additional features can be provided for free to promote customer loyalty or monetized to improve revenue streams. As a result, software-defined vehicles can deliver increased value over time, benefiting both drivers and the automotive industry.
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Wiring and harnesses
The electrical/electronic architecture of a vehicle refers to the convergence of electronics hardware, network communications, software applications, and wiring into one integrated system. This system controls an ever-increasing number of vehicle functions, from vehicle control and body and security to infotainment, active safety, and other comfort, convenience, and connectivity functionality.
The design process for a wiring harness involves first gathering all the necessary information about the vehicle's requirements and specifications, including the electrical and mechanical environment in which the harness will operate, as well as any constraints imposed by the vehicle's architecture. Schematic diagrams and cable layouts are used to ensure that all components are accurately represented and that the harness meets the final product's specifications.
The wiring harness design must also adhere to industry regulations and standards to maximize vehicle and component safety. For example, in the automotive industry, common UL standards cover aspects such as armored cables, power-limited circuit cables, and thermoplastic-insulated wires.
The growing complexity of vehicle systems and the increasing number of electronic components have resulted in heavier, larger, costlier, and more complex wiring harnesses. This has led to what is known as the Content Dilemma, which represents the conflict between the technology content that vehicle manufacturers want to integrate and the weight, cost, and packaging space required for wiring harnesses.
To address this dilemma, manufacturers are exploring methods to reduce the impact of added content and technology on the weight, cost, and complexity of wiring harnesses. This includes the use of advanced software solutions to optimize module locations and identify opportunities to save weight, cost, and reduce bundle sizes.
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Safety and comfort
Electric vehicles (EVs) are equipped with sophisticated electronics and peripherals, which enable the implementation of various applications. The architecture of the electronic systems in an EV is complex, with many components at play.
The term "electrical/electronic architecture" refers to the convergence of electronics, software, and wiring into one integrated system. This system controls an increasing number of vehicle functions, including vehicle control, body and security, infotainment, and active safety. The first integration of electrical and mechanical systems occurred in the 1950s with basic cruise control. Since then, advancements in electrical/electronic architecture have led to audio and lighting enhancements, emissions controls, and data and communication protocols.
The integration of electronic components in vehicles has improved reliability and safety while driving, as well as energy efficiency, weight reduction, and cost savings. For example, regenerative braking allows the electric motor to capture kinetic energy and convert it into electrical energy to recharge the battery, improving energy efficiency. Furthermore, advancements in chassis design and active suspension systems contribute to improved driving comfort and safety, particularly in electric vehicles with in-wheel motors (IWMs).
The rise of all-electric vehicles has prompted the development of new electrical/electronic architectures that consider the power and data needs of all devices within the vehicle, aiming to streamline and integrate these needs for an enhanced digital user experience.
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Frequently asked questions
Vehicle electrical architecture refers to the convergence of electronics hardware, network communications, software applications, and wiring into one integrated system that controls vehicle functions.
The three main components of an EV architecture are the battery, the motor, and the controller/charger. The battery stores the energy, the motor drives the wheels of the car, and the controller/charger converts the energy from the battery into a usable form to power the motor.
While the mechanical aspects of EVs and internal combustion vehicles are similar, the electrical parts differ significantly. EVs have dedicated circuits for various functions, such as traction battery systems, power regulation circuits, and battery charging circuits.
A well-designed electrical architecture promotes reliability and safety while driving and improves efficiency by reducing energy consumption, weight, and costs. It also enables the implementation of various applications and enhances control over the functionality of the vehicle.
There has been a shift from hardware to software in vehicle electrical architecture. While early electrical architectures had limited and isolated Electronic Control Units (ECUs), modern vehicles require many additional ECUs for safety features and infotainment systems, leading to the creation of specific networks for efficient inter-system communication. This has resulted in a need to simplify the architecture and reduce hardware layers to facilitate multi-system integration and communication between different software suppliers.
