The modern automobile industry is experiencing perhaps the most radical transformation in the entire history of its existence. Engineering thought, which for decades focused on increasing volume and number of cylinders, is now forced to find a balance between environmental friendliness, economy and performance. Global environmental standards Euro 6 and Euro 7 dictates strict limits, forcing manufacturers to reconsider fundamental operating principles heat engines.
The question of what are the directions for improving automobile engines no longer has one simple answer, as the industry has taken the path of multi-vector development. Some companies are betting on full electrification, others on improving traditional circuits, and still others are looking for salvation in synthetic fuel. Understanding these processes is necessary for everyone who plans to buy a car in the coming years, because the cost of ownership and liquidity of the vehicle will depend on the chosen technology.
In this article we will analyze in detail the key technological trends that shape the face of modern engine building. You'll find out why downsizing is not dead, how the system works Mild-Hybrid and why do engines need water.
Downsizing and improving combustion efficiency
Term downsizing (downsizing) has become the auto industry's mantra over the past decade. The essence of the concept is simple: reducing engine displacement and number of cylinders while maintaining or even increasing power output. This is achieved through the use of high pressure turbocharging and direct fuel injection. For example, a 1.0-liter three-cylinder engine today can produce power comparable to naturally aspirated two-liter units of the past.
⚠️ Attention: Operation of highly boosted small-displacement engines requires strict adherence to oil change intervals and the use of only high-octane fuel specified by the manufacturer in order to avoid detonation and destruction of the piston group.
However, simply reducing volume is only half the equation. The second direction is combustion process optimization. Engineers are introducing ultra-high pressure injection systems (up to 350 bar and higher for gasoline), which allows them to create an ideally homogeneous fuel-air mixture. This reduces particulate emissions and improves engine thermal efficiency.
- 🚀 Introduction of turbines with variable geometry to minimize the “turbo lag” effect.
- ⚙️ Use of variable valve timing systems on the intake and exhaust shafts (VTEC, VANOS, VVT-i).
- 💧 Water injection to cool the combustion chamber and increase the compression ratio.
Modern engine control systems (ECUs) operate at tremendous speed, adjusting operating parameters in real time. Algorithms take into account hundreds of factors: from fuel quality to atmospheric pressure and driving style. This allows you to squeeze maximum efficiency out of every gram of fuel burned, making small volumes surprisingly elastic.
Hybridization and electrification of power plants
No other area of improvement causes as much controversy and interest as hybridization. This is not just adding a battery, but a fundamental change in the architecture of the powertrain. The internal combustion engine (ICE) ceases to be the only source of traction and often operates in a narrow, most efficient speed range, or is completely turned off in traffic jams.
There are several levels of hybridization. Mild hybrids (Mild-Hybrid) use a 48-volt system to assist with acceleration and operate the start-stop system, which saves up to 15% of fuel. Full hybrids (Full Hybrid) are capable of traveling short distances exclusively on electric power. Finally, plug-in hybrids (Plug-in) combine the advantages of an electric vehicle and an internal combustion engine, offering an electric range of up to 100 km.
The introduction of electrical components made it possible to solve one of the main problems of internal combustion engines - low torque at low speeds. Electric motors, on the contrary, produce maximum traction from the first revolutions. Synergy These two energy sources give the car dynamics that are inaccessible to traditional engines of similar power, with significantly lower fuel consumption.
Hybridization allows you to use the internal combustion engine only in maximum efficiency mode, shifting the work at starts and accelerations to electric motors.
Alternative fuels and hydrogen technologies
As the world prepares for a full transition to electric vehicles, engineers are actively looking for ways to make traditional fuels greener. One of the key areas is CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas). Methane and propane-butane have a higher octane number and burn cleaner than gasoline, which allows you to increase the compression ratio and reduce exhaust toxicity without complex neutralization systems.
However, the real "Holy Grail" is hydrogen. Here development follows two paths. First - hydrogen internal combustion engines, which burn hydrogen instead of gasoline. Such engines require minimal design changes, but have problems with efficiency and fuel storage capacity. Second way - fuel cells (Fuel Cells), where hydrogen reacts with oxygen to produce electricity for the motor. The only by-product here is water.
Synthetic fuels are also gaining popularity (e-fuels), produced from renewable energy sources and CO2 captured from the atmosphere. The use of such fuel makes the existing fleet of internal combustion engines carbon neutral.
- 🌱 Reducing CO2 emissions by 20-25% when switching to natural gas.
- ⚡ Hydrogen fuel cells have an efficiency of up to 60%, which is twice as high as that of internal combustion engines.
- 🛢️ Synthetic fuel is compatible with any existing gas station infrastructure.
⚠️ Attention: The use of alternative fuels (HBO, hydrogen) requires regular checking of system tightness and ECU settings, since an incorrect mixture can lead to burnout of valves or overheating.
Reduced mechanical losses and friction
Huge potential lies in a banal reduction mechanical losses. In a traditional engine, up to 70% of fuel combustion energy is lost in the form of heat and friction. Engineers strive for every percent of efficiency, introducing advanced solutions in the field of lubrication and materials.
One such solution is to use oil-filled hydraulic compensators and roller pushers instead of sliding friction pairs. The pistons are coated with special antifriction compounds, and the cylinder walls are subjected to microscopic honing or spraying (for example, technology Nikasil or plasma spraying), which creates an ideal surface for the rings to work on.
Lubrication systems are also being improved. Variable displacement oil pumps are being introduced, which supply oil under pressure only when it is really needed (for example, at high speeds or load). At idle, the pressure decreases, reducing parasitic loss on the pump drive.
What are motor heat losses?
Heat loss is energy that goes into the cooling system and exhaust system without doing useful work. In modern internal combustion engines, engineers try to utilize this energy using exhaust heat recovery systems, turning it into electricity or mechanical propulsion.
Intelligent control systems and digitalization
A modern engine is essentially a computer with wheels. Digitalization control processes allows you to implement functions that were previously physically impossible. Electronic throttle valves, electrically driven turbos and fully programmable valve timing are all controlled by sophisticated algorithms.
Predictive analytics occupies a special place. The vehicle's navigation system transmits data about the terrain and traffic situation to the engine ECU. The car “knows in advance” that there is a rise or a traffic light ahead, and accordingly controls the operation of the engine: it charges the hybrid battery in advance, changes gears or changes the ignition timing.
Complex protocols are used for diagnostics and fine tuning. Engineers connect to the port OBD-II and use specialized software to analyze parameters in real time. This allows you to identify microscopic deviations in the operation of the cylinders and correct them programmatically, without interfering with the hardware.
The table below compares the effectiveness of various enhancement technologies:
| Technology | Increase in efficiency | Reduced emissions | Implementation cost |
|---|---|---|---|
| Turbocharging | 10-15% | Average | Low |
| Direct injection | 5-8% | High (NOx) | Average |
| Mild hybrid (48V) | 10-12% | High (CO2) | High |
| Phase change system | 3-5% | Average | Low |
Development prospects: what awaits us in the future
The future of automobile engines lies in the plane technology convergence. Pure internal combustion engine in its current form is doomed to transformation. We are moving towards creating “smart” power generators that will work in tandem with electric motors, batteries and energy recovery systems.
In the next 10 years, mass introduction of cycle engines is expected Atkinson or Miller in conventional cars, since they provide better efficiency, although they lose in power, which is compensated by electric traction. We can also expect the emergence of engines running on 100% synthetic fuel, which will extend the life of classic designs in niche and sports segments.
The most important aspect will be modularity. The platforms will be created so that a 3-cylinder internal combustion engine, a 4-cylinder hybrid or a fully electric power plant can be installed on one base. This will allow factories to respond flexibly to changes in the market and legislation.
When choosing a car with a modern, complex engine, be sure to check the availability of official service support and the availability of spare parts, since repairing such units requires specific equipment.
How often do you need to change the oil in turbocharged direct injection engines?
For modern turbo engines with direct injection, it is recommended to reduce the oil change interval to 7-8 thousand km, even if the manufacturer allows 15 thousand. This is due to high thermal loads on the turbine and the risk of coking of the injectors.
Is downsizing harmful to engine longevity?
Low volume in itself is not harmful, but high power density (removing a lot of power from a small volume) creates high mechanical and thermal loads. With proper operation and quality maintenance, such engines last a long time, but their service life is often lower than that of simple large-volume naturally aspirated engines.
Is it worth buying a hybrid if there is no way to charge it from an outlet?
Yes, it's worth it. Even without charging from the network (Plug-in) hybrids effectively use braking regeneration and operate the internal combustion engine in optimal mode to charge the battery. Their fuel consumption will still be lower than that of conventional cars, especially in the city.
What is the Atkinson cycle and why is it more economical?
The Atkinson cycle is characterized by a longer expansion stroke compared to the compression stroke. This allows for more complete use of the energy of burned gases. However, such engines have less power at low speeds, so they are ideal for working in conjunction with an electric motor.