The brand holder of Cummins diesel generator sets belongs to Cummins Inc. of the United States. Its key components and technologies adopt advanced American manufacturing technology. The products are synchronized with American Cummins technology and combined with the characteristics of the Chinese market. They are developed and designed with leading heavy-duty engine technology concepts. They have strong environmental adaptability, high uninterrupted operation reliability, excellent fuel economy, strong component versatility, and the advanced microprocessor-based controller and unique casing design enhance the product advantages of system performance.

I.Definition of diesel engine related terms

1. Gross power/net power

Gross power is the output power of the engine without any accessories, and net power is the output power of the engine after removing the power of accessories such as fans and chargers.

2. Fuel consumption/specific fuel consumption

Fuel consumption is the fuel consumption of the engine per unit time, and specific fuel consumption is the fuel consumption of the engine per unit time and per unit power.

3. Load cycle

The actual load and speed change law after the engine is installed on the diesel generator set.

4. Load factor

The actual output power of the engine is the percentage of the maximum output power at the rated speed.

5. Speed ​​factor

The ratio of the actual speed of the engine to the rated speed of the engine.

6. Instantaneous power

The diesel generator set is required to work continuously for no more than 1 hour at this power.

7. Continuous power

The diesel generator set can work continuously at rated power.

II.Selection conditions of diesel generator sets

1. Operating environment

(1) Maximum ambient temperature: consider cooling capacity;

(2) Minimum ambient temperature: consider cold start measures;

(3) Altitude: consider power reserve and power reduction;

(4) Dusty environment: consider the air intake system, such as using an air pre-filter;

(5) Humid environment: consider electrical corrosion and air filter damage;

(6) Local fuel quality: poor oil quality should be re-matched filter type or load external filter;

(7) Operator level: should be given on-site guidance and brief training; if it is a strictly electric power place or a unit used as the main power source, it should be concentrated in Cummins for professional training.

2. Power matching and precautions

(1) Factors to consider when matching power:

① Net power/total power: consider the power consumption of accessories;

② Power reserve;

③ Fuel consumption ratio;

④ Maximum power;

⑤ Engine speed regulation characteristics: full-range speed regulation/two-pole speed regulation, speed regulation rate

⑥ High idle speed (not rated speed) and low idle speed of the engine;

(2) Common problems in matching:

① Selecting instantaneous power when continuous power should be selected: engine life and reliability are reduced;

② Insufficient power reserve, resulting in the equipment not being able to work normally when the engine power drops slightly;

③ Not considering the use environment, resulting in insufficient power in plateaus or difficulty in cold starting, engine overheating, etc.;

④ Using two-pole speed regulation when full-range speed regulation should be used, or the speed regulation rate is not appropriate.

III. Advantages of Cummins generator sets

1. Advanced design, compact size, and moderate weight

The structural design of Cummins generator sets adopts advanced technologies such as computer-aided design, solid model analysis, and crankshaft stress computer analysis to improve material strength. The volume and weight are much thicker than other brands of generator sets of the same power level.

2. Low fuel consumption and reduced operating costs

The fuel consumption rate is low and the fuel consumption curve is quite flat, which greatly reduces the cost of Cummins units, which is an advantage that other brands of units cannot compare with.

3. Economical and convenient maintenance

Compared with other brands of units, the filter replacement cycle of Cummins generator sets is significantly longer, and the units use fewer filters. The maintenance cost is only about half of the maintenance cost of domestic brand units. Almost all maintenance work points of Cummins generator sets are concentrated on one side of the unit, making maintenance work very easy to carry out, reducing work and saving machine room space.

4. Quiet and clean

(1) The equipment has low operating noise, which can better meet the needs of regions and departments with strict noise requirements.

(2) The exhaust emission indicators of Cummins generator sets can meet the strict emission regulations in Europe and North America. It is a particularly clean generator set and is more competitive in China, where environmental protection requirements are increasingly stringent.