Automatic voltage stabilization control and protection method, device and system for vehicle-mounted generator

Abstract

The invention provides an automatic voltage stabilization control and protection method, device and system for a vehicle-mounted generator. Comparative reference voltage of a voltage sensor is obtained; and according to direct current voltage output by the voltage sensor, the direct current voltage output by the voltage sensor is stabilized at the comparative reference voltage. According to the automatic voltage stabilization control and protection system for the vehicle-mounted generator, the automatic voltage stabilization value is accurate, the voltage stabilization time is short, output voltage of the vehicle-mounted generator can be monitored automatically, and thus a vehicle engine is made to operate in an idling mode and meanwhile the output of the generator to a load is cut off. The output voltage of the vehicle-mounted generator is controlled by changing the rotating speed of the vehicle engine, the voltage sensor is used for controlling the rotating speed of the vehicle engine, and therefore the output voltage of the vehicle-mounted generator is automatically controlled to be at rated voltage and super-undervoltage automatic protection is achieved. Both analog signals and digital accelerograph control signals can be output, nearly all chassis of vehicles with electronic fuel injection engines are covered, operation is simple, and usage is convenient and reliable.

Description

technical field [0001] The invention relates to a vehicle-mounted generator system, in particular to a method, device and system for automatic voltage stabilization control and protection of a vehicle-mounted generator. Background technique [0002] The fully automatic voltage stabilization control and over-voltage and under-voltage automatic protection of vehicle-mounted generators have been fully valued by the industry in recent years. Attracted attention, but this technical field is still blank. [0003] Because the on-board generator needs to solve two major problems in actual use: one is that the power should be large (generally more than 30 kilowatts), and the other is that the volume should be small. These two problems are precisely a pair of contradictions. The power of the high-power generator is a diesel engine, and the volume of the diesel engine is much larger than that of the generator set. The actual user is at the expense of the limited space in the car. (Th...

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Problems solved by technology

However, in actual use, unsolvable technical problems have been encountered. Generally, the rated speed of a high-power generator set is 1300r / min~1500r / min, and it outputs a stable voltage at the rated speed, while the car engine has the best speed at a certain speed. Optimum output power, this rotating speed is generally between 1900r / min~2300r / min, but the speed ratio of the power take-off connected between the automobile engine and the generator is increasing (there is still no suitable deceleration in the prior art ratio power take-off)

This has caused great contradictions in use: on the one hand, the electrical load requires the generator to provide a stable voltage output, and on the other hand, the car engine can only work at half of the rated speed, and its power output is only rated at 1 / 2 or so

In this way, the following problems arise during use: after the car engine is started, its speed is adjusted so that the output voltage of the generator is the rated voltage. Ask for more power, but the power provided by the car engine at this time cannot meet the needs of the generator, causing the engine speed to drop, resulting in a drop in the output voltage of the generator

Also, if only frequency-independent demand is detected in the generator, the engine speed may be boosted

[0007] This patent document is an improvement of a commonly used gasoline and diesel generator set at present. It uses an "engine controller" to control the speed of the power source (internal combustion engine) of the generator. The device with the scope of use of the unit has a very small actual scope of use and can only be used for limited loads within the electric welding machine, and still belongs to the category of general generator sets

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