ТОЙОТА ФОРУМ БЪЛГАРИЯ

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2019 Corolla Hatch Drivetrain

An all-new TNGA-based powertrain with a direct-injected 2.0L I4 (M20A-FKS) is smaller and lighter than its 1.8L I4 predecessor, which helps to lower Corolla Hatchback’s center of gravity. The 2.0-liter is also quieter for improved Noise Vibration Harshness (NVH) with additions like a more rigid crank case with integrated stiffener; a lighter resin cylinder head; and a ribbed oil pan.

The M20A-FKS is equipped with Toyota’s latest D-4S fuel-injection that uses high-pressure direct-injection and low-pressure PFI (Port Fuel Injection). The setup adapts its injection method based on driving conditions so that ideal combustion is executed. The engine also features Dual VVT-i (Variable Valve Timing-intelligence), with VVT-iE (Variable Valve Timing-intelligence by Electric motor) on the intake side and VVT-i on the exhaust. VVT-iE uses one electric motor instead of oil pressure to control the variable valve timing. Together, the valve timing systems enhance power output and fuel mileage, and cut harmful emissions.

Other notable improvements to the Dynamic-Force engine include:

Longer stroke
Compression up to 13:1
Enlarged valve nip angle
Enhanced intake port efficiency with laser clad valve seat
Key Benefits:
Higher rate of combustion, high tumble flow, and high intake air flow volume
Pistons with round top surface and slanted side wall
Key Benefits:
Consistent tumble flow and rapid combustion maintained
Less knocking and higher compression ratio
Friction reduction between piston skirt and cylinder
Lubrication enhanced with three oil jets dedicated to each cylinder
Key Benefits:
Better MPG, dynamic performance, less knocking, and less oil consumption
Lighter weight timing chain
Key Benefits:
Low cabin noise and reduced friction
Drain path within crank case to return oil from cylinder head to oil pan
Key Benefits:
Less oil agitation caused by the crankshaft, which means less rotation resistance
Connecting Rod made of high strength steel with optimized shape
Key Benefits:
Reduction in weight
Camshaft with concave profile
Key Benefits:
Increased valve lift amount
Optimized water jacket in head and block
Key Benefits:
Enhanced cooling and reliability

The bolded pieces should above improve thermodynamic efficiency significantly!

2019 Corolla Hatch Prelim Specs

M20A-FKS
I4 w/ 16-valve DOHC, chain drive with Dual VVT-i (Intake: VVT-iE, Exhaust: VVT-i)
Bore x Stroke (mm) 80.5 x 97.6
Displacement (cc) 1987
Compression Ratio 13.0:1
Fuel System Direct Injection, Port Injection
Horsepower and Torque TBD

Corolla Hatch uses either an all-new Dynamic-Shift CVT (K120), or a six-speed iMT (Intelligent Manual Transmission) gearbox (EG60). The Dynamic-Shift CVT has simulated 10-speed Sequential Shiftmatic steps, Sport Mode, and paddle shifters. It features a number of innovative elements, including the world’s first launch gear in a passenger vehicle CVT.

The transmission system utilizes gear drive when starting from a full stop, resulting in powerful acceleration, while at the same time, resolving the momentary sluggish feeling that was previously present during accelerator operation. Both smooth and comfortable launch performance are realized. When switching from gear drive to belt drive, the transmission system uses highly responsive gear change control technologies cultivated from automatic transmission technology.

With its launch gear in place, the belt has been tuned for higher gear ratios. This new setup not only improves the efficiency of belt operation, but it also enables the adoption of wider gear ranges, whereby realizing a class-leading gear ratio range of 7.5 for the 2.0L class.

Another benefit of the launch gear is a reduced input load. This enables the size of both belt and pulley components to be reduced. Furthermore, the belt angle has been narrowed and pulley diameters reduced, resulting in shifting speeds that are 20 percent faster. Powerful and predictable acceleration is realized, as is an endearing driving experience.

An all-new six-speed iMT with downshift rev-matching control. The new gearbox is lighter (by 15 pounds; total weight of 88 pounds) and shorter (by 0.94 inches), making it one of the world’s smallest transmissions. Its small size contributes to improved fuel efficiency.

The gearbox also offers world-leading transmission efficiency, while the use of iMT controls, which automatically adjust engine revolutions when changing gears, ensures smooth gear shifting?free of uncomfortable recoils?for the driver.

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