Kubota: Development of the D1105-K Electronically Controlled Small Industrial Diesel Engine — Building on the D902-K to expand Kubota’s line of electronically controlled small engines using the unique TVCR combustion system-

Development of the D1105-K electronically controlled small industrial diesel engineBuild on the D902-K to expand Kubota’s lineup of electronically controlled small engines using the unique TVCR combustion system

September 26, 2022
Kubota Company

Kubota Corporation (Headquarters: Naniwa-ku, Osaka, Japan; President and Managing Director: Yuichi Kitao; hereinafter, “Kubota”) developed the D1105-K electronically controlled small industrial diesel engine (displacement 1.123 L; ci -after “D1105-K”) as a power source that complies with the latest European, American and Chinese emission regulations. The engine adopts Kubota’s unique TVCR combustion system to achieve both greater fuel efficiency and a compact size that makes it easy to operate as a replacement for conventional Kubota engines. Kubota will contribute to a carbon-neutral society by developing a range of engines capable of reducing CO emissions2 emissions.

1. Context and development objectives

  • Kubota has met the diverse needs of construction and industrial machinery manufacturers around the world, including compliance with the latest emission regulations in each country. These efforts have earned the company the world’s leading market share*1 in diesel engines under 100 horsepower for industrial use.

  • Stricter emissions regulations, not only in Europe but also in the rest of the world, are currently driving decarbonization needs. Electronic engine control fine-tunes fuel injection for better fuel efficiency than conventional mechanical engines, which should reduce CO2 emissions and make the exhaust gases cleaner. For these reasons, Kubota has endeavored to expand its line of electronically controlled small engines.

  • However, replacing a mechanical motor with an electronically controlled motor usually requires many other components for the electronic control. These additional parts require more space to mount the motor, which can lead to a large number of main machine design changes.

  • The D1105-K benefits from an electronic control system optimized specifically for small engines alongside the TVCR combustion system that combines Kubota’s unique combustion and fuel technologies.

  • The D1105-K is equipped with the TVCR combustion system, which combines our original combustion system with unique electronic control technology developed specifically for small engines.

  • The development kept the same size as a mechanical engine with equivalent power while achieving an electronically controlled engine with great fuel efficiency and exhaust gases so clean that there is no visible black smoke.

  • In addition to complying with worldwide emission regulations, the D1105-K complies with China’s most stringent national smoke regulations, Category Ⅲ. Additionally, manufacturers can directly mount the ECU*3 to the motor to reduce the load on the machine design when replacing the motor, which should reduce development time.

  • Kubota will contribute to the realization of a carbon-neutral society by strengthening its lineup of not only large electronically controlled engines already underway, but also small electronically controlled diesel engines.

  1. *1.Based on internal research (2020 Power Systems research 〔PSR〕 Survey)
  2. *2.Regulations in China on black smoke emissions from off-road vehicles
  3. *3.The Electronic Control Unit (ECU): an electronic device to optimally control fuel consumption, fuel injection pressure, timing and cycle according to operating conditions

2. Features

[1] Remove black smoke

The D1105-K eliminates visible black smoke emissions often produced when starting, accelerating or suddenly applying a load to an engine. This new engine complies with the strictest Chinese national smoke regulations, category Ⅲ.

[2] Low fuel consumption

The D1105-K is equipped with the TVCR combustion system, which combines our original combustion system with unique electronic control technology developed specifically for small engines.
These innovative technologies improve fuel consumption by around 5% compared to conventional models.

[3] Acquire engine running data, improve drivability and work efficiency

Electronic control allows CAN to be used*4 communication protocol, which can control engine rotation and torque through signals sent from vehicles. The CAN also collects engine drive data needed for telematics technology. This data improves drivability and operational efficiency by aggregating torque characteristics that mechanical control cannot achieve to reduce rotational speed under sudden load.

[4] Improved compatibility

Manufacturers can easily replace conventional mechanical engines with the D1105-K as specifications, such as exterior dimensions as well as intake and exhaust and PTO position, remain the same. It can also reduce the extra work placed on the design of the main machine usually required to install an engine with an electronic control unit, such as the design of the installation position and harnesses, as the ECU is mounted directly on the engine.

[5] Improved serviceability

Using a large oil pan extends the period between essential regular oil changes up to 500 hours.*5. Improved serviceability reduces the time needed to service the engine.

  1. *4.Controller Area Network (CAN): A global serial communication bus standardized by ISO that allows microcontrollers and devices to communicate with each other without a host computer.
  2. *5.Performance varies with operating conditions.

3. Product introduction

Engine model






Rated Output/RPM

18.5 kW (24.8 hp)/3000 rpm

Combustion and fuel system


Beginning of mass production

After December 2023

Contact for inquiries about this engine:

Engine Planning and Sales Promotion Department

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Kubota Company published this content on September 26, 2022 and is solely responsible for the information contained therein. Distributed by Audienceunedited and unmodified, on September 26, 2022 07:44:09 UTC.

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