Toyota Yaris Hybrid 2021.

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The new Yaris uses the latest, fourth-generation Toyota hybrid technology and introduces new components that have been engineered to be compact, lightweight and efficient. It also equips the car with its first TNGA engine.

For the engineering team, the focus was not just on delivering a more efficient system, but also on making the car more enjoyable to drive, with tuning and calibration to suit European roads.

The data indicates the scale of the achievement. Overall efficiency has increased by 20%, which typically would be at the cost of performance. In fact, power is 16% higher at 116 DIN hp (total system output), with a 15% improvement in 0-100 km/h acceleration, to 9.7 seconds, and sharper response to the driver’s use of accelerator.

The car’s all-electric EV capabilities have been transformed: speeds of up to 130 km/h can be reached and EV driving is possible for longer periods in urban traffic. This means drivers can enjoy many of the benefits of a battery electric vehicle, but at a lower price and with no concerns about when or where the battery can be recharged.

CO2 emissions have dropped to 85 g/km and the WLTP combined cycle fuel economy figure is 3.7 l/100/km, a 20% improvement.

These values are unprecedented for a Toyota model and demonstrate the ability of hybrid electric technology to deliver even higher efficiency, without sacrificing performance.

The engineering team was committed to addressing the most common criticisms Toyota heard from Yaris Hybrid drivers. These focused on overtaking acceleration performance at highway speeds (the acceleration time from 80 to 120 km/h has been cut by two seconds to 8.1 seconds); quicker and more responsive acceleration at lower speeds, for example when negotiating a roundabout; and more linear, natural acceleration when driving on open, winding roads, to create a stronger fun-to-drive quality.

Each of the four principal components in the hybrid system contributes to the new Yaris’ enhanced drivability: the all-new Hybrid Dynamic Force Engine makes its debut in the car; the new lithium-ion battery; the all-new hybrid transaxle; and the power control unit. All have been developed using the TNGA philosophy, ensuring efficient design and ease of production at scale.

1.5-litre Hybrid Dynamic Force Engine

The all-new 1.5-litre Hybrid Dynamic Force engine is from the same TNGA engine family as the 2.0-litre four-cylinder unit featured in the Toyota Corolla and C-HR. It has a long stroke, 14.0:1 compression ratio and high-speed combustion with better temperature and pressure control. This contributes to the its exceptionally high thermal efficiency – 40% – ensuring that more of the energy potential of every drop of fuel is captured.

In common with all Toyota’s hybrid engines, it uses the Atkinson cycle, which keeps the intake valves open for longer, delaying the compression stroke. This improves efficiency and fuel economy, but reduces power output. Nonetheless, the new engine has a maximum output of 93 DIN hp/68 kW with a peak 120 Nm of delivered at lower revs (3,600 rpm).

The three-cylinder configuration also bring benefits in terms of noise levels. When running at 4,000 rpm, its performance is like a four-cylinder unit operating at 3,000 rpm, thus delivering more power and torque, but generating less noise.

The transmission is a e-CVT automatic – an electric continuously variable transmission – which provides linear acceleration feel and quiet operation.

The new Yaris adopts a lithium-ion hybrid battery, with voltage rising from 144 to 177.6 V. The number of cells has been reduced, from 120 to 48. The current flow is significantly improved: by 100% into the battery and 50% out.

With a significantly higher power density, the battery is both smaller and lighter, by 12 kg. Its compact dimensions allow it to be located beneath the rear passenger seat, together with the auxiliary battery, avoiding intrusion in the load space.

Lithium-ion battery technology is better able to supply current flow, which is key to the new Yaris having powerful EV performance in urban driving.

The high-rigidity body contributes to higher safety levels (detailed in the Safety chapter below) superior chassis handling and responsiveness, ride comfort, and lower noise and vibration levels.

The new Yaris’ GA-B platform – including both chassis and drivetrain – delivers a 37% increase in torsional rigidity, taking it to a best-in-segment level. This has been achieved through a series of body reinforcements, a stiffer dash panel and more extensive use of spot welds and bonding adhesive in the car’s construction.

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