And everyone mentioned the Toyota Corolla this model, I believe that most consumers will not be unfamiliar, as a popular model in the compact car, Toyota Corolla occupies a large market share, but also has a huge fan base, whether it is a fuel model or a hybrid model has achieved very excellent market results. However, the new generation of Corolla has added a naturally aspirated engine codenamed M15B, and it is also a three-cylinder engine, so what are the technical highlights and shortcomings of this engine?
At present, Corolla offers two fuel powertrains, as well as a hybrid powertrain, the first fuel engine codenamed M15B 1.5L naturally aspirated engine with a maximum power of 89 kW and a maximum torque of 148 N·m, while the second fuel engine, code-named 9NR/8NR, has a maximum power of 85Kw and a maximum torque of 185 N·m. As we all know, the reputation of the three-cylinder engine in the domestic automobile market is not good, and the three-cylinder engine will be associated with the characteristics of strong jitter and high noise by consumers, so what confidence does Toyota have to bring it to domestic consumers?
The first is for better fuel economy and stronger power performance, yes, you heard it right, it's stronger power performance. Many consumers have the inherent impression that the turbocharged engine is faster than the naturally aspirated engine in the acceleration process, but the compression ratio of this M15B engine has reached 13:1, and the EGR cooling structure has been added, which is much more efficient than the 9NR/8NR 1.2T turbo engine. From the data point of view, this three-cylinder engine code-named M15B has a better acceleration of 0-100km/h.
In addition, this M15B engine is a member of the Toyota Dynamic Force Engine series, and the M20 engine on the Asian Dragon is also from TNGK. Because the M15B engine is a three-cylinder engine, the lack of a cylinder will lead to the camshaft and crankshaft shorter, and will also make the valve, connecting rod and other components less, smaller, lighter, plus all-aluminum material, the weight of a single engine is 84.5kG, compared to the same model of 1.2T engine lighter 25Kg, and the benefit of lightweight engine is lower fuel consumption, and improve the utilization rate of the engine cabin, so that the shaft load distribution is more reasonable.
It is worth mentioning that the Otto and Atkinson dual circulation technology equipped with this engine, when fresh air enters the cylinder, it will drive the oil and gas spewed out by the porous injector in the cylinder, forming a rapid flow rate in the cylinder, when the mixed steam is ignited, it can burn rapidly in a short period of time, so that the fire core is formed faster and burns more uniformly. We also mentioned above that the M15B engine has a cylinder compression ratio of 13:1, which is industry-leading data, with a valve clamp angle of 41° and a stroke bore ratio of 1.2:1, which will also make the flow rate faster and smoother when entering the cylinder, thereby improving fuel economy. According to the declaration information, the comprehensive fuel consumption of the 100-kilometer Corolla equipped with the M15B engine is about 5.2L-5.3L, while the comprehensive fuel consumption of the Corolla of the same series 1.2T engine is in the range of 5.5L-5.7L.
Above we mainly mentioned the technology of this M15B, and the product advantages that these technologies give it, of course, the three-cylinder engine also naturally has its defects. Due to the lack of a cylinder, the cylinder ignition angle will be unbalanced, resulting in jitter resonance. In addition to resonance, the lack of a cylinder can also cause the vehicle to produce particularly large noise in the case of ignition, idle, acceleration, etc. Although Toyota also added a balance shaft, as well as smaller counterweights and gear cushions, and also added more sound insulation materials in the engine compartment, the jitter and noise phenomenon of the new car leaving the factory is almost the same as the traditional four-cylinder engine, but with the aging of various accessories of the later car, the jitter and noise of the three-cylinder engine is still a congenital drawback.
Judging from the various data and analysis above, the new Toyota Corolla's engine, code-named M15B, does have many technical highlights and is also at the leading level among many three-cylinder engines. However, although Toyota has greatly optimized the jitter and noise of this engine, it is impossible to completely eradicate it, but if its technical advantages and disadvantages are balanced, the overall performance of this engine is still good.