A starter circuit protection system

Abstract

The invention discloses a starter circuit protection system, comprising a battery pack, an ignition switch, a first contactor, a starter motor and a circuit loop formed by a generator, characterized in that: the circuit loop is further added with a second contactor and a safety relay, the 86th pin of the safety relay is connected to the N end of the generator, the 87a pin of the safety relay is connected to the S pin of the second contactor, the 30th pin of the safety relay is connected to a fuse box, the B pin of the second contactor is connected to the B end of the starter motor, and the A pin of the second contactor is connected to the positive electrode of the battery pack; the invention adds the second contactor and the safety relay, so that the power main line of the starter and the starter circuit can avoid short circuit or adhesion after the engine is working, thereby preventing the starter from being damaged and the circuit from catching fire, and effectively ensuring the safe operation of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of engine starting systems of bulldozers, and in particular relates to a starter circuit protection system. Background Art

[0002] After long-term operation, the bulldozer is in bad working conditions, has severe bumps, wear and cracking of the main line, and aging of electrical appliances, which may cause short circuits and fires. Prevent the starter from being damaged under abnormal circumstances during the operation of the bulldozer and short circuits of the power main line.

[0003] The engine starting system of the existing bulldozer is composed of a battery pack, a contactor, an ignition switch, a starting relay, a starter and other components. The maximum starting power of the starter used by our company is 9 KW. When the engine is started, the battery pack voltage drops below 18V and the circuit current can reach 468A. Due to the excessive current, it is impossible to install a suitable fuse on the starter main circuit. When the starter and the power main line are short-circuited, the power cannot be cut off, causing a fire accident. Summary of the invention

[0004] In order to solve the above technical problems, the present invention designs a starter circuit protection system, which can prevent the power main line of the starter and the starter circuit from short-circuiting or sticking after the engine is running, thereby preventing the starter from being damaged and the circuit from catching fire, thereby effectively ensuring the safe operation of the equipment.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A starter circuit protection system includes a circuit loop formed by a battery pack, an ignition switch, a first contactor, a starter motor and a generator, characterized in that: the circuit loop is further increased with a second contactor and a safety relay, the 86th pin of the safety relay is connected to the N end of the generator, the 87a pin of the safety relay is connected to the S pin of the second contactor, the 30th pin of the safety relay is connected to a fuse box, the B pin of the second contactor is connected to the B end of the starter motor, and the A pin of the second contactor is connected to the positive pole of the battery pack.

[0007] Furthermore, pin 85 of the safety relay and pin E of the second contactor are grounded.

[0008] Furthermore, the A pin of the first contactor is connected to the B terminal of the ignition switch through a slow-blow fuse and a fuse box, and the A pin of the first contactor is also connected to the positive electrode of the battery pack.

[0009] Furthermore, the starter motor uses a 24V voltage, and the generator uses a 28V voltage.

[0010] Furthermore, the B pin of the first contactor is connected to the B terminal of the generator, and the S pin of the first contactor is connected to the ACC terminal of the ignition switch.

[0011] Furthermore, the S terminal of the starter motor is connected to the R2 terminal of the ignition switch.

[0012] Furthermore, the safety relay is a timing safety relay, wherein the 5th pin of the timing safety relay is connected to the S terminal of the second contactor, the 7th pin of the timing safety relay is connected to the N terminal of the generator, and the 1st pin of the timing safety relay is connected to the safety relay fuse in the fuse box.

[0013] The above technical solution can achieve the following beneficial effects:

[0014] The invention adds a second contactor and a safety relay, which can prevent the starter and the power supply main line of the starter circuit from being short-circuited or adhered after the engine is working, thereby preventing the starter from being damaged and the line from catching fire, and effectively ensuring the safe operation of the equipment.

[0015] The invention has a simple way of adding in the loop, and the improvement does not need to change the circuit of the whole machine again, the improvement cost is low, the price generated is high, and the problem is solved more targetedly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a partial diagram of the starter circuit protection improvement.

[0017] Figure 2 This is the general diagram of the bulldozer starter circuit.

[0018] Figure 3 It is the circuit relationship diagram between the timing safety relay and the second contactor. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] like Figure 1As shown, a starter circuit protection system includes a circuit loop formed by a battery pack, an ignition switch, a first contactor, a starter motor and a generator, characterized in that: the circuit loop further includes a second contactor and a safety relay, the 86th pin of the safety relay is connected to the N end of the generator, the 87a pin of the safety relay is connected to the S pin of the second contactor, the 30th pin of the safety relay is connected to the fuse box, the B pin of the second contactor is connected to the B end of the starter motor, and the A pin of the second contactor is connected to the positive electrode of the battery pack. The 85th pin of the safety relay and the E pin of the second contactor are grounded. The A pin of the first contactor is connected to the B end of the ignition switch through a slow-melting fuse and a fuse box, and the A pin of the first contactor is also connected to the positive electrode of the battery pack. The starter motor uses a 24V voltage, and the generator uses a 28V voltage. The B pin of the first contactor is connected to the B end of the generator, and the S pin of the first contactor is connected to the ACC end of the ignition switch. The S end of the starter motor is connected to the R2 end of the ignition switch.

[0021] Embodiment 1:

[0022] exist Figure 2 A second power contactor is installed on the bus line, and a safety relay is installed. The safety relay controls the on and off of the second contactor. When the starter motor is not started, the current flows from the fuse through the 30th and 87ath pins of the safety relay to the S end of the second power contactor, so that the contacts of the second power contactor are connected, and the starter motor is continuously powered. After the starter motor is started, the power generation signal at the N end of the generator turns on the 85th and 86th ends of the coil of the safety relay. At this time, the safety relay is energized, and the 30th and 87ath pins are disconnected, and the second power contactor is no longer powered. The main power line of the starter motor is de-energized. When the engine is turned off, the generator no longer outputs the power generation signal, and the second contactor is re-energized to connect the main power line to prepare for the next start.

[0023] Figure 2 As shown, the S end of the 24V starter motor is connected to one pin of the starter relay, and the other pin of the starter relay is connected to the 20A fuse in the fuse box.

[0024] The B end of the ignition switch (key switch) is connected to the 20A fuse tube in the fuse box, and then connected to the first contactor.

[0025] Embodiment 2:

[0026] Figure 3As shown, a timing safety relay is installed to control the on and off of the second contactor of the power supply. When the engine is not started, the current flows from the fuse through the 1st and 5th pins of the relay to the S end of the second contactor of the power supply, so that the A and B contacts of the contactor are connected, and the starter is continuously powered. After the engine is started, the power generation signal at the N end of the generator makes the 2nd and 7th pins of the coil of the timing safety relay return to the circuit. At this time, the safety relay is energized and starts timing. When the set time is reached, the 1st and 5th pins are disconnected, and the second contactor of the power supply is no longer powered. The main power line of the starter motor is de-energized. When the engine is turned off, the generator no longer outputs the power generation signal, and the second contactor of the power supply is re-energized to connect the main power line to prepare for the next start.

[0027] In the above embodiment: pin 86 of the safety relay and pin 7 of the timing safety relay are also connected to the h terminal of the timer, and the h terminal of the timer is connected to the instrument light switch.

[0028] The water temperature sensor is connected to the T end of the water temperature gauge, which is then connected to the instrument light switch. The oil temperature sensor is connected to the T end of the oil temperature gauge, which is then connected to the instrument light switch.

[0029] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A starter circuit protection system, comprising a circuit loop formed by a battery pack, an ignition switch, a first contactor, a starter motor and a generator, characterized in that: The circuit loop further includes a second contactor and a safety relay, wherein the 86th pin of the safety relay is connected to the N terminal of the generator, the 87ath pin of the safety relay is connected to the S pin of the second contactor, the 30th pin of the safety relay is connected to the fuse box, the B pin of the second contactor is connected to the B terminal of the starter motor, and the A pin of the second contactor is connected to the positive electrode of the battery pack; Pin 85 of the safety relay and pin E of the second contactor are grounded; The A pin of the first contactor is connected to the B terminal of the ignition switch through a slow-blow fuse and a fuse box, and the A pin of the first contactor is also connected to the positive electrode of the battery pack; The starting motor uses a 24V voltage, and the generator uses a 28V voltage; The B pin of the first contactor is connected to the B terminal of the generator, and the S pin of the first contactor is connected to the ACC terminal of the ignition switch; Connect the S terminal of the starter motor to the R2 terminal of the ignition switch; The safety relay adopts a timing safety relay; Pin 5 of the timing safety relay is connected to the S end of the second contactor, pin 7 of the timing safety relay is connected to the N end of the generator, and pin 1 of the timing safety relay is connected to the safety relay fuse in the fuse box; The 86-pin of the safety relay and the 7-pin of the timing safety relay are also connected to the h-end of the timer, and the h-end of the timer is connected to the instrument light switch.

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