Modern urban and intercity transport is undergoing enormous changes, and the question of what fuel buses run on today is becoming key to understanding the logistics of megacities. Twenty years ago, the answer would have been clear: the vast majority of equipment ran on diesel fuel. Today, however, the energy landscape for passenger transportation has changed dramatically due to environmental standards and economic factors.
Drivers, engineers and fleet owners closely monitor the market, choosing between proven classics and innovative solutions. Energy efficiency and cost of ownership come to the fore when purchasing new machines. In this article we will analyze in detail all existing types of engines, their advantages, disadvantages and prospects for implementation in various climatic conditions.
The variety of refueling options is now amazing: from the usual liquid hydrocarbons to compressed gas and clean electricity. Understanding these differences is necessary not only for specialists, but also for passengers, who are increasingly thinking about environmental safety your daily route. Let's dive into the technical details and find out what makes the multi-ton vehicles move in your city.
Diesel fuel: a classic that never loses ground
Despite active electrification, diesel engines still remain the “workhorse” of the world bus fleet. High torque, availability of fuel and a design proven over decades make them an uncontested choice for many regions. They are especially popular in intercity transportation, where range plays a critical role.
Modern diesel engines differ significantly from their predecessors. Systems Common Rail and particulate filters have significantly reduced noise levels and emissions of harmful substances. However, the quality requirements for diesel fuel remain high, and the use of substandard fuel can quickly damage expensive fuel equipment.
- 🚌 High energy intensity of the fuel provides a large range without refueling.
- ⛽ The developed gas station infrastructure makes it easy to refuel anywhere in the country.
- 🔧 Relative ease of maintenance and availability of spare parts for wide sale.
However, environmental standards Euro 5 and Euro 6 force manufacturers to implement sophisticated exhaust gas treatment systems such as AdBlue. This increases the cost of operation, but is a prerequisite for allowing equipment into the centers of large cities with strict emission restrictions.
When purchasing a used diesel bus, be sure to check the condition of the particulate filter and exhaust gas recirculation (EGR) system, as replacing them can cost up to 30% of the vehicle's price.
Natural Gas: Methane vs. Propane
Natural gas motor fuel confidently occupies its niche, offering a balance between economy and environmental friendliness. Mostly buses are transferred to compressed natural gas (CNG/methane) or liquefied petroleum gas (LPG/propane-butane). Methane is considered a more promising option due to its lower cost and better ecology, although it requires heavier and more expensive cylinders.
Engines running on gas have a lower thermal load on the parts of the cylinder-piston group, which extends the life of the engine. The oil in such engines changes less frequently, and oxidation occurs more slowly. However gas equipment takes up useful space in the body, sometimes to the detriment of the number of seats for passengers.
A significant advantage is the reduction in noise level when the engine is running, which is especially important for night routes in residential areas. Gas buses can often be found as part of municipal transport in large cities, where the issue of air cleanliness is especially acute.
⚠️ Attention: The operation of gas buses requires strict adherence to safety rules when refueling and regular checking of the tightness of connections, since gas is lighter than air and rises quickly when leaking.
Electric propulsion: the future has already arrived
Electric buses are the fastest growing segment of the public transport market. They do not produce exhaust gases, are virtually silent and have high engine efficiency. Lithium-ion batteries modern models allow you to travel up to 300-400 kilometers on a single charge, which is quite enough to work on city routes during a shift.
There are two main approaches to charging: overnight (deposit) and opportunity charging (recharging at final stops). The first option allows the use of smaller batteries, but requires a powerful infrastructure in the fleet. The second option requires the installation of pantographs or fast charging stations along the route, but allows greater flexibility.
Despite the high initial cost, electric buses much cheaper to maintain. The absence of an internal combustion engine, transmission, cooling and exhaust systems reduces the number of components requiring regular replacement. Winter operation remains a challenge, as the operation of the interior heaters significantly reduces the range.
☑️ Assessing the city’s readiness for electric buses
It is important to note that recycling used batteries is becoming a new environmental challenge. Manufacturers are already developing “second life” programs for batteries, using them in stationary energy storage devices after the resource has been exhausted in transport.
Comparison table of fuel types
To clearly understand the differences, we present comparative characteristics of the main types of energy carriers used in buses. The data is averaged and may vary depending on the specific equipment model and operating conditions.
| Parameter | Diesel | Methane (CNG) | Electricity | Hydrogen |
|---|---|---|---|---|
| Cruising range (km) | 400-600 | 300-450 | 150-400 | 350-500 |
| Filling/charging time | 5-10 min | 10-15 min | 30-180 min | 10-15 min |
| Cost of 1 km | High | Low | Very low | Average |
| CO2 emissions | High | Average | Zero (locally) | Zero |
As can be seen from the table, electrification gives a gain in the cost per kilometer of travel and the environment, but loses in the speed of replenishing energy reserves. Diesel remains the leader in terms of autonomy, and gas represents a reasonable compromise.
Hydrogen fuel cells: technologies of tomorrow
Hydrogen buses combine the advantages of electric traction with the refueling speed of traditional vehicles. Installed inside them fuel cell, which produces electricity through a chemical reaction of hydrogen and oxygen. The only product of combustion in this case is clean water dripping from the exhaust pipe.
Such cars are already plying the streets of some European and Asian cities. They are equipped with compressed hydrogen tanks and a small capacity buffer battery. This allows braking energy to be recovered and used for acceleration, increasing overall performance. energy efficiency systems.
The main obstacle to mass adoption is the lack of infrastructure. Producing green hydrogen (produced using renewable energy) is still expensive, and the network of hydrogen refueling stations is extremely rare. However, many experts see hydrogen as the future for intercity transportation, where the weight of electric bus batteries has become an issue.
Why are hydrogen buses rare?
The main reason is the high cost of producing the fuel itself and the complexity of its transportation. In addition, the efficiency of the chain “electricity -> electrolysis -> compression -> fuel cell -> motor” is lower than when directly charging the battery of an electric bus.
Hybrid installations: the golden mean
Hybrid buses use a combination of an internal combustion engine (usually diesel) and an electric motor with a battery. This scheme allows the engine to operate in optimal mode, and the electric motor to take on peak loads during acceleration. During braking mode, energy is returned to the battery.
There are series hybrids, where the internal combustion engine operates only as a generator, and parallel hybrids, where both engines can rotate the wheels. Hybridization allows you to reduce fuel consumption by up to 30% in the urban “start-stop” cycle and reduce wear on the brake pads.
For cities that are not yet ready for full fleet electrification, hybrids are a great transition. They do not require charging infrastructure and can operate at existing gas stations, while significantly improving the environmental situation.
⚠️ Attention: When operating hybrid buses, you must remember the high voltage in the on-board network (up to 600 Volts), which requires special qualifications of personnel to carry out repair work.
Prospects and economic efficiency
Choosing a bus fuel is always a trade-off between capital expenditure (CAPEX) and operating expenditure (OPEX). An electric bus costs 2-3 times more than its diesel counterpart, but its maintenance and refueling are much cheaper. Payback period electric trains in intensive operation can be 5-7 years.
Government subsidies and grants play a huge role in this equation. In many countries, the purchase of environmentally friendly transport is subsidized, which makes the transition to new types of fuel economically feasible for carriers. In addition, tightening CO2 taxes are gradually making diesel less attractive.
In the long term, the market will move towards complete decarbonization. However, for remote regions with a harsh climate and weak energy diesel and gas will remain uncontested leaders for many years to come. Technological diversity is the strength of the modern transportation industry.
There is no ideal fuel: the choice depends on the specific conditions of the route, climate, availability of infrastructure and the available budget for the purchase and maintenance of equipment.
To sum up, we can say that the era of the diesel monopoly is becoming a thing of the past. Today we are seeing a fascinating variety of technical solutions, each of which finds its own consumer. The future lies in flexibility and adaptation of technologies to the specific needs of a city or region.
Why do electric buses do not withstand severe frosts?
At low temperatures, the chemistry in lithium-ion batteries slows down, reducing their performance. In addition, a significant part of the battery energy is spent on heating the interior and the battery itself, which can reduce the range by 30-40%.
Is it dangerous to ride a bus with gas equipment?
If all safety standards are observed and regular technical inspections are carried out, gas cylinders are safe. They undergo crash tests and are equipped with valves that shut off the gas supply in the event of an accident or fire.
How long does an electric bus battery last?
Modern traction batteries are designed for 10-15 years of operation or 3000-5000 charging cycles. After this, they lose some of their capacity, but can often be used in stationary energy storage systems.