Control system of starting motor of lifeboat diesel engine

Abstract

The invention discloses a control system of a starting motor of a lifeboat diesel engine. A storage battery positive electrode is sequentially connected with a starting button first contact, a reset button, a time relay coil and a storage battery negative electrode; a time relay normally open contact carries out self-protection on the starting button first contact; the storage battery positive electrode is connected with a starting button second contact and then is divided into two paths, one path is sequentially connected to a pulse contact, a starting contactor coil and the storage battery negative electrode, and the other path is connected to a time relay delay contact, a protection relay contact, a power supply of a double-intermittency automatic circulation relay and the storage battery negative electrode; the power supply of the double-intermittency automatic circulation relay is also connected with an auxiliary relay coil in parallel; an auxiliary relay normally open contact carries out self-protection on a starting button second contact; the storage battery positive electrode is sequentially connected with a starting contactor normally-open contact, a starting motor S end and the storage battery negative electrode; and the storage battery positive electrode is connected to the starting motor B end. According to the system, by setting the starting time of the diesel engine, undertime and overtime starting of the diesel engine is avoided, and the starting requirement of the lifeboat diesel engine is met.

Description

technical field [0001] The invention relates to a diesel engine starter motor control system, in particular to a lifeboat diesel engine starter motor control system, which belongs to the technical field of diesel engine protection. Background technique [0002] The starting method of the lifeboat diesel engine (that is, the main engine of the lifeboat) is mainly the electric starter motor, such as figure 1 As shown in the schematic diagram of the starter motor structure, after the start button of the starter motor is pressed, the (S) terminal on the motor is connected to the battery, the electromagnetic switch is energized, and the iron core in the electromagnetic switch overcomes the spring resistance to move to the left, driving the gear of the mesher to extend Out, when the mesher gear and the flywheel ring gear of the diesel engine are fully meshed in place, that is, when the inner iron core of the electromagnetic switch moves to the left and reaches the limit position u...

AI Technical Summary

Problems solved by technology

At present, the starting motor of the lifeboat diesel engine is controlled by manually controlling the starting and stopping of the starter motor through the starting switch; this control method is simple and easy to use for experienced operators; but for inexperienced operators, it may cause Three problems, one: the starter motor works under time, the second: the starter motor works overtime, and the third: the starting interval is not long enough

[0003] First, the starter motor does not work on time, and when the diesel engine speed reaches its minimum starting speed, it stops starting, resulting in unsuccessful starting of the diesel engine

[0004] Second, the starter motor works overtime. There are two situations. One is that the diesel engine fails to start, and the power-on time of the starter motor continues to be extended, hoping to start the diesel engine successfully, or the diesel engine fails to start due to a diesel engine failure, and still tries to start many times. , I hope to start the diesel engine, because the battery capacity of the lifeboat diesel engine is limited, usually about 100AH, long-term high-current discharge, it is easy to cause the battery to lose power, or even make the battery invalid

The other is that the diesel engine starts successfully. The operator continues to energize the motor in order to increase the insurance factor for the successful starting of the diesel engine. Once the diesel engine is successfully started, even if the diesel engine is running at idle speed, its idle speed is about 1000 rpm. At this time, if The starter motor is still energized, and the ring gear on the flywheel of the diesel engine will drag the starter motor to rotate. The transmission ratio of the flywheel ring gear and the starter motor telescopic gear is converted by about 10 times. The speed of the starter motor is about 10,000 rpm. If the starter motor cannot be cut off in time, it will easily lead to motor failure

[0005] Third, the starting interval is not long enough

If the diesel engine fails to start, the battery voltage has not fully recovered, and it starts again, that is, the interval between the second starts of the diesel engine is not long enough, which reduces the power output of the starter motor and affects the number of times the diesel engine can be started without supplementary charging within 30 minutes of the battery pack. , while affecting the service life of the battery

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