Gasoline engine

Mobility for tomorrow: the optimized gasoline engine

Even in the future, two thirds of all new cars worldwide will still be driven by an internal-combustion engine. This is reason enough for Bosch to make one of the world’s most important powertrains as efficient and resource-saving as possible.

Optimized gasoline powertrain: interview with Heiko Weller

People want to stay mobile, even in a future where environmental protection is crucial. The focus will continue to be on affordability and availability. All the more reason to optimize vehicles with internal-combustion engines to address both sustainability and the demand for affordable mobility.

Heiko Weller explains how hybridization and synthetic or renewable fuels can considerably reduce the amount of CO2 emitted by vehicles with internal-combustion engines and thereby make them an important component of sustainable mobility concepts.

The optimized gasoline powertrain in numbers

Improved carbon footprint

through the use of fuels generated from renewable sources

Will still be the most

widespread powertrains

in cars for many years

Flexible use

for various system pressures of up to 350 bar

A mileage of

around 200,000 km

can be reached with an average internal-combustion engine

Born in 1951. Conceived for the future: gasoline direct injection

Gasoline direct-injection

It was the beginning of the 1950s when Bosch launched the first gasoline direct-injection system onto the market. Nowadays, this system is still the industry standard in new internal-combustion engines. The constantly rising demand for mobility around the world means that the need for optimized fuel consumption and reduced emissions is also growing – a challenge that continues to make gasoline direct injection a key technology for the future.

Advantages for drivers and manufacturers: gasoline direct injection

Gasoline direct injection

Gasoline direct injection offers many advantages for drivers and vehicle manufacturers alike. Downsizing and turbocharging make fuel consumption and CO2 emissions much lower while maintaining the same output. Thanks to the high level of torque, drivers benefit from an improved vehicle response and more dynamic handling. Increasing the charge-air pressure while reducing the displacement ensures a specific output of 60–100 kW/l. Bosch has kept on developing gasoline direct injection since 1951, offering in this regard not only the very best technology to vehicle manufacturers, but also many years of technical expertise.

On the road to the future: improvements to the gasoline powertrain


For gasoline engines – as for their diesel counterparts – the answer to urgent environmental concerns is an improved system approach. As an example, the use of the latest particle filters in conjunction with an innovative injection system reduces the emissions of gases and particulate matter to a fraction of the levels demanded by legislation.

As such, the influence of these vehicles on air quality is not only negligible in major conurbations.

Worldwide efficiency: gasoline port fuel injection

Gasoline port fuel injection

Gasoline port fuel injection is the world’s most widespread powertrain system for gasoline engines. This system convinces with its low cost, simplified technology, and new, innovative further developments. If gasoline port fuel injection is used in engines with an output of around 60 kW/l and downsizing concepts, it offers significant cost advantages over systems with high-pressure direct injection. Thanks to the simplicity of the low-pressure system (approx. 6 bar), the complex requirements of high-pressure control can be dispensed with, while the robust combustion process even tolerates lower-quality fuels.

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Harmonious coexistence: port fuel and direct gasoline injection

With port fuel and direct gasoline injection, Bosch combines two distinct fuel injection systems. Two usually separate approaches give rise to a combined system where the strengths of each subsystem ideally complement those of the other. The advantages are lower fuel consumption and reduced particle emissions. Depending on the driving situation, one of the two systems steps in and puts its respective strengths into practice. Port fuel injection impresses in partial-load operation, while gasoline direct injection’s higher knocking threshold makes it the more efficient choice at full loads.

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Port fuel and direct gasoline injection 01 Port fuel and direct gasoline injection 02

Further solutions

Electronic engine-control unit

Electronic engine-control unit

The electronic engine-control unit (ECU) is the central control device and centerpiece of the engine management system.

Fuel-supply module

Fuel-supply module

The fuel-supply module doses the correct quantity of fuel for reducing CO2 emissions.

High-pressure pump

High-pressure pump

As the name suggests, the high-pressure pump pumps the required fuel into the connected rail at high pressure.

High-pressure injector solenoid valve

High-pressure injector solenoid valve

The high-pressure injectors dose and atomize the fuel in the combustion chamber at high pressure.

Fuel rail

Fuel rail

The fuel rail conveys fuel to the injectors once the high-pressure pump has brought the fuel’s pressure to the system level.

Fuel injector

Fuel injector

The task of the injector is to inject the fuel in such a way that it homogeneously mixes with the air supplied.

Heating control unit

Heating control unit

At low temperatures, the heating control unit warms the fuel up to ensure smooth engine starts.

Fuel rail for flex fuel systems

Fuel rail for flex fuel systems

The fuel rail receives the fuel from the fuel supply system and distributes it to the fuel injectors.

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