Regan Brown
Self-driving cars, also known as autonomous cars (AC), driverless cars, or robo-cars, are vehicles that can operate with reduced or no human input. As of late 2024, no system has achieved full autonomy. While the future of self-driving cars is promising, several barriers to change must be addressed, including the power source of these vehicles. The power-consumption problem posed by autonomous cars has been highlighted, with current models requiring some battery power for the viability of long-term operations. However, current battery technology is inefficient and lacks the storage capacity needed for long-distance travel. As a result, companies like Ford are focusing on hybrid self-driving vehicles in the short and medium term, while also anticipating improvements in battery technology.
| Characteristics | Values |
|---|---|
| Fuel Type | Gasoline, Battery-electric, Hybrid, Hydrogen fuel-cell |
| Fuel Efficiency | Platooning (adaptive cruise control) allows vehicles to maintain a constant distance and speed, improving fuel efficiency |
| Future of Fuel | The future of the auto industry is expected to be electric |
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What You'll Learn
Hydrogen fuel-cell technology
While there is no indication that self-driving cars are fueled differently from regular cars, there are several fuel types that could be used in driverless cars. One of these is hydrogen fuel-cell technology.
Hydrogen fuel-cell vehicles (HFCVs) are powered by an electric motor, using electricity generated by a fuel-cell stack in which hydrogen combines with oxygen to produce electricity and water vapour. This is in contrast to battery-powered electric vehicles, which rely on a built-in battery charged by an external power source. HFCVs produce their own electricity, giving them an efficient power plant on board.
HFCVs are emission-free, with the only byproduct being water vapour. They also have shorter refuelling times than electric vehicles, taking around five minutes to refuel at a hydrogen fuelling station.
However, HFCVs are currently more expensive than comparable electric or internal combustion engine vehicles due to lower production volumes and the high demand for platinum, which acts as a catalyst in electricity generation. The high pressure required to store hydrogen onboard also contributes to the cost.
Despite these challenges, HFCV technology has potential. Hydrogen is a widely available element, and the infrastructure for hydrogen fuelling stations is being expanded worldwide. As production volumes increase, costs are expected to decrease, and HFCVs could become a more viable alternative to electric vehicles.
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Electric power
The trucking industry, for example, consumes a large amount of gas in the United States. Automated trucks could be designed to be electric or hydrogen-powered, which would increase fuel efficiency and reduce environmental impact. Hydrogen fuel-cell technology is starting to receive increased attention from automakers due to its promise of increased uptime and zero emissions. However, it is not yet ready for large-scale manufacturing due to logistical obstacles.
In the meantime, hybrid self-driving vehicles that combine electric and gasoline power are seen as a short- and mid-term solution by some manufacturers, including Ford. These vehicles can take advantage of the benefits of both technologies while battery technology improves and hydrogen fuel cells become more feasible for large-scale production.
The power-consumption problem posed by autonomous vehicles is a significant challenge. A recent study by the University of Michigan Center for Sustainable Systems found that current models of autonomous cars will need to employ some aspects of battery power for long-term viability, but that in the short term, batteries are not efficient or capable enough to be the primary power source.
As computer hardware companies work to improve the performance and efficiency of their products, they collaborate with autonomous car manufacturers to implement the best solutions for each model. The future of driverless cars is exciting, and electric power will likely play a significant role in its success.
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Gasoline
The precision control over the electric motors also allows every single wheel to adjust to slippery road conditions, making a rear-wheel-drive vehicle almost as safe, or maybe even safer, on icy road conditions than a gas car with front-wheel drive or all-wheel drive. The combination of a computer AI driver with an electric car is so much more versatile and can react so much faster to traffic situations that it just does not make sense to continue producing (or buying) gas cars.
A computer can react way quicker than a person can. There are only two things that a gas car can do quickly: slam on the brakes and turn the wheel. Humans have to adapt to this by adjusting their plans to the latency of the car’s gas pedal. They have to get used to the notion that their action won’t result in an immediate reaction. With a mechanical automated transmission, a lot of things need to happen: mechanical torque vectoring with the differential gearbox; altering rpm of the engine every time another transmission is selected; regulating rpm by pumping more or less fuel into the engine. None of that is instant.
As of 2016, nearly all self-driving vehicles were hybrids or pure electric cars. However, the power-consumption problem posed by autonomous cars was highlighted in a recent study. The report found that current models of autonomous cars will need to employ some aspects of battery power for the viability of the long-term vision, but in the short term, manufacturers just do not have the means to make batteries the primary power source. Not only is current battery technology inefficient, but it also lacks storage capability, which limits the range of vehicle operation.
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Environmental impact
The environmental impact of driverless cars is a complex issue that is still being studied and debated. While some argue that autonomous vehicles (AVs) or self-driving cars can be beneficial for the environment, others caution that they could have negative consequences. The impact of driverless cars on the environment will depend on various factors, including the energy sources used to power them, the efficiency of their routing, and the policies implemented to regulate their use.
One of the potential benefits of driverless cars is their ability to reduce the number of vehicles on the road. Families that currently own multiple automobiles may be able to rely on a single autonomous vehicle to meet all their needs. For example, a driverless car could drop both parents at work, the kids at school, and then drive back home by itself. Some reports estimate that by 2030, there will be more than 11 million shared driverless vehicles globally, serving an average of 64 users per vehicle. This shift towards shared mobility can help reduce the number of cars on the road, leading to decreased traffic congestion and improved air quality.
Most AVs today have advanced electric engines, which offer significant opportunities for emission savings compared to conventional vehicles with internal combustion engines. Electric vehicles, including electric AVs, do not emit carbon or other pollutants from their tailpipes. However, it is important to consider the source of electricity used to power these vehicles. If the batteries of autonomous electric vehicles (A-EVs) are charged by clean energy sources, their environmental impact is minimal. On the other hand, if they are charged using electricity generated by coal or natural gas, their environmental benefits are diminished.
While electric AVs have the potential to reduce tailpipe emissions, the computers required to run self-driving cars could become a significant source of greenhouse gas emissions. The vast computing infrastructure powering onboard cameras and operating driving algorithms consumes a substantial amount of energy. Researchers from the Massachusetts Institute of Technology have found that if self-driving vehicles become widely adopted, the computers powering them could generate as much greenhouse gas as all the world's existing data centres, contributing about 0.3% to global emissions.
Another concern is the potential increase in auto use due to the convenience of driverless cars. Automation could lead to a dramatic rise in the total number of miles travelled by vehicles, as car travel becomes easier and people opt for longer trips or additional journeys. People might be willing to live farther from their workplaces or schools and commute longer distances if they can work, relax, or engage in other activities during the trip. This increase in driving could lead to more congestion, energy consumption, and pollution, unless regulators take steps to make car travel less appealing.
In conclusion, the environmental impact of driverless cars is multifaceted and depends on various technological, social, and policy factors. While AVs have the potential to reduce emissions and improve energy efficiency, the benefits may be offset by increased auto use and the energy demands of the technology itself. To ensure a positive environmental outcome, policymakers and manufacturers must work together to integrate AVs into a multimodal, electric, and shared transportation system that discourages single-occupancy rides and promotes sustainable energy sources.
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$245.74
Safety and regulations
The National Highway Traffic Safety Administration (NHTSA) in the United States is responsible for regulating vehicle safety and has significant engineering expertise. However, as of 2024, the NHTSA has not established comprehensive national safety standards for self-driving cars. This regulatory uncertainty is partly due to the difficulty in enforcing certain proposals, such as requiring safety cases for self-driving cars. In the absence of federal action, the responsibility for granting licenses for self-driving cars to operate on public roads has been delegated to individual states. This has resulted in a varied landscape of safety regulations across the country, with some states, like California, implementing rigorous regulatory systems, while others, like Arizona, are more relaxed in their approach.
The lack of standardised safety regulations for driverless cars has sparked concerns about liability in the event of accidents or incidents. As the technology advances towards full automation, questions arise about who is at fault when a self-driving car is involved in a collision. The concept of "driver or owner error" becomes less clear, and liability may shift towards the companies that sold the autonomous system or the manufacturers themselves. Addressing these liability issues is crucial for the widespread consumer adoption of driverless cars, as unresolved questions of responsibility could delay or hinder the integration of this technology into society.
To address these challenges, there is a growing consensus that a nationally consistent set of safety regulations needs to be established. These federal standards would provide a framework for state courts to refer to when dealing with liability cases involving autonomous vehicles. Additionally, the unique characteristics of driverless cars, such as their reliance on V2X (vehicle-to-everything) technology, introduce new safety considerations. For example, the connectivity of these vehicles to the internet raises cybersecurity concerns, including the potential vulnerability to hacking, malware, and ransomware. As a result, safety regulations must also address data protection and cybersecurity standards for driverless cars.
While the safety and regulatory landscape for driverless cars is still evolving, significant progress has been made. The NHTSA's December 2020 proposal indicated a step towards establishing national safety standards, and individual states have taken the initiative to authorise the operation of driverless cars within their jurisdictions. Despite the challenges, there is optimism that self-driving cars have the potential to revolutionise transportation and significantly enhance road safety by reducing human errors and preventing crashes, injuries, and fatalities.
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Frequently asked questions
Driverless cars can be fuelled by electricity, gasoline, or hybrid propulsion.
As of 2023, most driverless cars are fuelled by gasoline.
Electricity is a cleaner energy source than gasoline and can be generated from renewable sources.
Current battery technology is inefficient and lacks the storage capability needed for long-distance travel.
Hydrogen fuel-cell technology is an increasingly popular option for automakers, offering increased uptime and zero emissions.
