China's national smoke regulations Category III*
*China's regulations for vehicles
LIMITS AND MEASUREMENT METHODS FOR EXHAUST SMOKE FROM
NON-ROAD MOBILE MACHINERY EQUIPPED WITH DIESEL ENGINES
The new D902 electronically-controlled engine has been developed to comply with the latest emission regulations (output less than 19 kW) around the world. In addition to EPA Tier 4 (North America), Stage V (Europe), and China IV standards, the engine also complies with the most stringent of China's national smoke regulations, Category III.
D902-K is an all-in-one electronically-controlled engine that brings together Kubota's unique technologies to meet a wide range of needs, facilitating easy model upgrades without increasing development costs for the customer. With just one engine, we are reforming all aspects of equipment across the board, from industrial machinery to construction machinery.
Black smoke emissions can be reduced to an invisible level during start-up, acceleration, and sudden load. This is made possible by the new TVCR combustion system, which combines the original E-TVCS combustion system with a unique common rail developed specifically for small engines.
While maintaining its compact size and ease of installation, the system contributes to clean exhaust gas, low fuel consumption, and highly efficient operations, as well as ICT needs such as automation, unmanned operations, and hybridization.
Through adoption of the new combustion method TVCR, the D902-K has been improved to produce clean exhaust gas with no visible black smoke during engine start-up, acceleration, and sudden load.
*1：Opacimeter less than 0.8m-1
Fuel efficiency improved by about 5% compared to conventional model
Kubota's unique technology has overcome the obstacles to improving fuel efficiency in this class. In addition, the engine has high output and torque per displacement, combining both fuel efficiency and performance.
A comparison of the size of the D902-K
and the D902 conventional model
Facilitating easy model upgrades
The same external dimensions, air intake and exhaust positions, engine mount position, and PTO (power take-off) as the current model make it easy to upgrade. Kubota's engine, which is electronically controlled and yet so compact and lightweight, will contribute greatly to the development and design of your machinery.
Supports highly efficient and stable operations
The electronic control allows greater flexibility in setting the performance curve, enabling a broader output flat range in the rated range than with the conventional model.
As a result, the rotation fluctuation can be suppressed in response to workload fluctuations, contributing to an improved working environment for the operator.
SUPPRESS ROTATION REDUCTION
Intercommunication between the engine's ECU (electronically controlled unit) and the main machine's ECU enables integrated control of the mounted equipment. The D902-K with electronic control is therefore the optimal engine for equipment that requires advanced control, such as automatic/unmanned driving and hybrid systems. It is well equipped to respond to the growing need for digitalization.
The TVCR is Kubota's original combustion system.
The new combination of Kubota's original E-TVCS combustion system (new three-jet combustion system) and an electronically controlled fuel-injection system that differs from conventional electronically controlled governors enables injection control optimized to the operating conditions.
Optimization of RPM and fuel injection amount
The amount of fuel injected at startup is optimized to minimize smoke generation.
Kubota can offer the optimal engine platform to meet customers' individual requirements in terms of applications, product sales regions, and development products. Thanks to our extensive installation track record and development experience, we are also able to solve a wide variety of application-specific issues.
Kubota has developed an extensive and complete line-up of Kubota engines, available in a wide range of outputs to meet the needs of various markets. Our engines for the OEM market have outputs ranging from 4 kW to 157.3 kW, with a lineup available for each of our series.
*1: Gross intermittent SAE J1995
*2: Excluding cooling fan
Specifications and appearance are subject to change without prior notice.
Dimensions and dry weight are according to Kubota's standard specification.
Actual dimensions and weight depend on completed specifications.