Gasoline engines dominate the passenger car industry, and breakthroughs in their energy-saving technologies are crucial for achieving the "dual carbon" goal. This article analyzes from three aspects: inflation efficiency, mechanical losses, and combustion optimization.

1. Inflation efficiency optimization technology

Improvement of intake system: Adopting variable intake manifold technology, dynamically adjusting the length of the manifold through ECU. For example, a certain car model extends the manifold length at low speeds, increasing inflation efficiency by 12%; Shortening the manifold at high speeds increases power output by 8%.

Valve timing optimization: Applying variable valve timing (VVT) technology to achieve coordinated adjustment of intake valve closing angle and exhaust advance angle. According to actual test data, a 1.5T engine with VVT assistance can increase low-speed torque by 15% and reduce fuel consumption by 6%.

2. Mechanical loss reduction strategy

Lightweight material application: Using aluminum alloy pistons and titanium alloy connecting rods, the weight of reciprocating parts is reduced by 20%, and friction loss is reduced by 18%.

Low viscosity lubricating oil: using 0W-20 fully synthetic engine oil, combined with the oil pump pressure regulating valve, reduces the power consumption of the lubrication system by 10%.

3. Optimization direction of combustion process

Lean combustion technology: Through stratified injection and high-energy ignition system, achieve lean combustion with excess air coefficient λ=1.6. Under WLTC conditions, a certain vehicle model reduces NOx emissions by 40% and fuel consumption rate by 9%.

In cylinder direct injection+turbocharging: A certain 2.0T engine adopts 350bar high-pressure direct injection and dual scroll turbocharging, with a peak torque of 400N · m and a shortened acceleration time of 6.5 seconds per 100 kilometers.