Manufacturer of specialized in various engine camshafts
Recently, it has been reported that Ford seems to be considering adjusting its sports car strategy, replacing the four-cylinder engine for the Focus in order to enhance its competitiveness in the global market. The news was released at the beginning of this year, but it was not officially confirmed by Ford at the time. Many domestic media had speculated that Fox would use the Changan Blue Whale 1.5T four-cylinder engine in China to reduce costs and better fit domestic consumption. Needs.
Recently, Ford officially announced that Focus is about to adjust the power system, but the difference is that this approach is not just for the Chinese mainland market, but is based on the global The sales performance of the market and the new Fox's global strategy are adjusted, so it is impossible to use the Changan Blue Whale series engine. So, what other engines are available for Focus?
Ford’s new strategy
As we all know, Fox used a 1.5T four-cylinder turbocharged engine before. The engine is derived from Ford’s European EcoBoost 1.6T engine, while the cylinder block is derived from a 1.6L Ti-VCT gasoline direct injection engine. It has dual independent variable valve timing systems (based on DOHC dual overhead camshafts), which can effectively Improved intake and exhaust efficiency can effectively improve turbo response on turbocharged models, similar to Honda's VTC (Variable Timing Control) principle.
The 1.5T three-cylinder turbo engine currently in service is derived from the expansion of the 1.0T EcoBoost engine. It is worth mentioning that the engine is jointly developed by Ford and Honda. Researched and developed, which are respectively mounted on the entry-level models of the two compact cars, Focus and Civic. Therefore, the two share the variable timing technology of the intake and exhaust valves. This is why the engine valve control technology of the 1.0T EcoBoost is similar to the Honda VTC technology. .
Because the problem of dynamic balance of the crankshaft of a three-cylinder engine is very prominent, even the use of double balance shafts cannot reduce the frequency of the engine’s frequency resonance to the level of a four-cylinder engine. The inability to use lean combustion, turbulent ignition, homogeneous compression ignition and other technologies for the engine restricts the scalability of the power system. Under this premise, Ford had the idea of u200bu200breplacing the Focus with a more self-balancing engine. At present, it seems that the most likely power system to replace the three-cylinder engine is the EcoBoost 1.5T four-cylinder engine. This model can be easily matched with the existing gearbox and frame structure, so it can greatly reduce the development cost of new cars and improve products. Competitiveness.
Toyota’s crazy plan
At the Shanghai Auto Show not long ago, Toyota displayed the GR sub-brand in a high-profile manner. As the brand’s first domestic product, SUPRA occupies booth C. Bit, stole the show. However, the attention of the fans on the scene was still attracted by another small car placed in the corner, that is, the GR Yaris, which was completely developed by Toyota. It inherits the lineage of Toyota WCR racing. It not only represents the last glory of JDM, but also shows Toyota. As well as the future technical route of the GR brand, the engine part is the most concerned by car fans.
GR Yaris models are equipped with a new 1.6T three-cylinder engine, which can reach a maximum power of 192 kW. According to Toyota's official description, this G16E-GTS engine takes power and endurance as the key development goals to ensure that the engine can have sufficient endurance at full power output. The Ru0026D team borrowed some technologies from the WRC racing car and redesigned the combustion chamber model to ensure that the cooling water channel has the best performance and takes away more heat under the premise of a firm cylinder structure.
The engine cylinder head adopts a two-stage water jacket structure, and the coolant will flow to the lower water jacket area, closer to the top of the combustion chamber to increase the cooling effect of the combustion chamber. A partition wall is designed between the upper water jacket and the lower water jacket, so that the cylinder can withstand higher pressure and thermal load.
At the same time, the researchers optimized the shape of the intake port, injector spray and combustion chamber to improve high tumble flow (high tumble flow). ) Characteristics, and improve the air intake efficiency, while achieving stable combustion in the cylinder. Based on the research and development experience from the racing field, the researchers designed a valve seat with better performance and increased the diameter of the exhaust valve. After matching Toyota's new D-4S fuel injection system, the engine can meet the requirements of Euro VI D emission standards.
As the global market generally does not accept three-cylinder engines, Toyota still spends a lot of money to develop three-cylinder engines and match them to performance cars , It seems very different. In fact, Toyota chose the three-cylinder engine as the power system of the GR Yaris mainly because the three-cylinder engine is relatively short, so that the small engine compartment of the Yaris has room to accommodate the four-wheel drive system. In addition, the lighter weight also contributes to the distribution of the vehicle's front and rear axle loads. .
Summary of Uncle Che
Although both Toyota GR Yaris and Ford Focus are models with performance as their main selling point, they face The consumer groups of China are quite different. When Toyota vigorously promoted the GR sub-brand, they also used Japanese performance cars during the Japanese bubble economy in the 1990s as a car model to pave the way for the new car, which was able to attract many fans to pay for it. Although Fox has won the market reputation with its excellent handling, its influence on the car world is still not comparable to the Japanese cars of the 90s. Therefore, Toyota can use feelings to make fans ignore the drawbacks of the three-cylinder engine, while Ford cannot allow ordinary consumers to accept the treatment of 'lack of a cylinder'. From this point of view, consumers' acceptance of the three-cylinder engine also depends on the brand influence. Powerful. u200d
Copyright © 2020 Quanzhou yisheng machinery co.,ltd. | All Rights Reserved
