Toyota Hybrid System 2

Toyota Hybrid System 2

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1 Toyota Hybrid System 2
2 🔧 Toyota Hybrid System II (THS II) Overview
3 ⚙️ Overview of the 2.0-liter THS II
3.1 🔋 Key Powertrain Components:
4 🔍 How THS II Works
5 🧪 Key Features and Innovations
5.1 1. Dynamic Force Engine (M20A-FXS)
5.2 2. Compact Power Control Unit (PCU)
5.3 3. Smaller, More Efficient Battery
5.4 4. eCVT Transmission
6 📈 Performance & Efficiency
7 🚗 Vehicles Using the 2.0L THS II
8 🌿 Environmental Benefits
9 🔗 Helpful Resources & Links
10 Toyota Hybrid System PDF

Toyota Hybrid System 2

Toyota Hybrid System 2

The 2.0-liter Toyota Hybrid System (THS II) represents a major evolution of Toyota’s industry-leading hybrid technology, delivering a balance of power, fuel efficiency, and low emissions in a compact package. Introduced in the late 2010s and widely adopted across Toyota’s global lineup, the 2.0L version of THS II is used in models like the Toyota Corolla Hybrid, C-HR, and Lexus UX 250h.

🔧 Toyota Hybrid System II (THS II) Overview

The Toyota Hybrid System II (THS II) is an advanced hybrid powertrain that combines a gasoline engine with electric motors to optimize fuel efficiency and performance. Key components include:

  • Gasoline Engine: Typically an Atkinson-cycle engine designed for efficiency.
  • Motor Generator 1 (MG1): Functions primarily as a generator and starter motor.
  • Motor Generator 2 (MG2): Provides propulsion and regenerative braking.
  • Power Split Device: A planetary gear set that distributes power between the engine, MG1, and MG2.
  • Inverter/Converter: Manages power flow between the battery and electric motors.
  • High-Voltage Battery: Stores electrical energy for use by the electric motors.

⚙️ Overview of the 2.0-liter THS II

THS II (Toyota Hybrid System II) is a parallel-series hybrid system that combines a gasoline engine with one or more electric motors and a battery pack. The system intelligently switches between, or combines, electric and gasoline power depending on speed, load, and driver demand.

🔋 Key Powertrain Components:

ComponentSpecification
Gasoline Engine2.0L Dynamic Force I4 (M20A-FXS)
Max Engine Output~144 hp (107 kW)
Electric Motor Output~107 hp (80 kW)
Combined System Output~196 hp (145 kW) (varies slightly by region)
Transmissione-CVT (Electronically Controlled Continuously Variable Transmission)
Battery TypeLithium-ion (or Nickel-Metal Hydride in some markets)
Drive TypeFWD or E-Four (AWD with rear motor in select models)

🔍 How THS II Works

  1. Start-up: The vehicle typically starts in EV mode, using only electric power at low speeds.
  2. Acceleration: The system seamlessly blends in the gasoline engine for additional power.
  3. Cruising: At moderate speeds, the gasoline engine does most of the work; the electric motor assists as needed.
  4. Regenerative Braking: The system recaptures braking energy and stores it in the battery.
  5. Stop/Start: The engine shuts off when stopped to save fuel and reduce emissions.

🧪 Key Features and Innovations

1. Dynamic Force Engine (M20A-FXS)

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  • Utilizes high-speed combustion, a long stroke design, and multi-hole direct fuel injectors.
  • Operates under the Atkinson cycle for greater thermal efficiency (~41%).
  • Extremely low internal friction and advanced exhaust gas recirculation (EGR) improve efficiency.

2. Compact Power Control Unit (PCU)

Toyota Hybrid System 2
  • The inverter/converter is smaller and more efficient than previous generations.
  • Better thermal management and lighter weight.

3. Smaller, More Efficient Battery

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  • The lithium-ion battery is compact, with quicker discharge/charge cycles.
  • Positioned under the rear seats to preserve cargo space and lower the center of gravity.

4. eCVT Transmission

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  • Simulates gear shifts for smoother acceleration and improved efficiency.
  • No traditional gear ratios—uses planetary gearsets to manage power flow between engine, motors, and wheels.

📈 Performance & Efficiency

Depending on the vehicle and market, here’s what the 2.0L THS II delivers:

  • 0–100 km/h (0–62 mph): ~7.5–8.1 seconds
  • Fuel Economy (WLTP): ~4.4–5.3 L/100 km (~44–53 mpg US)
  • CO₂ Emissions: ~96–120 g/km (depending on model/load)

This performance is notable because it provides near-diesel-level fuel economy with gasoline reliability and lower emissions.

🚗 Vehicles Using the 2.0L THS II

Here are some popular models that use this hybrid system:

  • Toyota Corolla Hybrid (Hatchback, Sedan, Touring Sports)
  • Toyota C-HR Hybrid
  • Toyota Corolla Cross Hybrid (select markets)
  • Lexus UX 250h / UX 260h
  • Toyota Noah/Voxy (Japan)
  • Toyota RAV4 Hybrid (base engine in some Asian and European trims)

🌿 Environmental Benefits

  • Extremely low NOx and particulate emissions
  • Qualifies for eco-incentives and green tax credits in many regions
  • Can drive short distances in EV-only mode, especially in stop-start traffic

🔗 Helpful Resources & Links

Toyota Hybrid System PDF

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