Generator output alarm device of engine

Abstract

The invention relates to a generator output alarm device of an engine, and relates to the field of diesel engines, the generator output alarm device comprises a current transformer used for collecting output current of the engine and a control unit electrically connected with the current transformer, and the control unit processes electric signals output by the current transformer and controls operation of an alarm indicator and a pulse generator. The alarm indicator is used for indicating whether the output current of the generator exceeds a rated value, and the pulse generator is used for outputting a pulse square wave signal to an engine electronic control unit or other vehicle electronic control units. The problem that the output current state of the generator cannot be transmitted to an engine or a vehicle electronic control unit is solved, the multi-gear design adapts to generators with different rated outputs, the duration of the working condition exceeding the rated can be sent out, and a user or a maintainer is helped to know the use condition of the generator in time and make a coping strategy.

Description

Technical Field

[0001] The invention relates to the field of diesel engines, and in particular to a generator output alarm device of an engine. Background Art

[0002] In the prior art, the engine electronic control unit or other vehicle electronic control unit usually only monitors the generator output voltage, that is, the system voltage after the engine is started, and the generator output current is generally not directly monitored. If it is necessary to monitor the generator output current, the existing means mostly use clamp-on ammeters or current collectors. These devices usually measure when the vehicle is idling, and the generator output generally does not exceed the rated output state. However, in the dynamic environment of the whole vehicle, these devices have the problem of being difficult to fix and observe, and cannot interact with the engine or vehicle electronic control unit. When the generator output current exceeds the rated use range, these devices cannot transmit the generator output to the electronic control unit. In addition, when the vehicle's electrical load exceeds the rated output of the engine generator, although the generator can continue to work at a current that is a certain amount higher than the rated output, long-term operation will have an adverse effect on the quality and life of the parts. Summary of the invention

[0003] The purpose of the present invention is to provide an engine generator output alarm device, which collects the output current of the generator through a current transformer and outputs a signal to a device control unit, which is then controlled and converted by the device control unit to output overcurrent status and working duration signals and alarm, thereby solving the problem of monitoring and alarming the generator output overcurrent condition.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention provides an engine generator output alarm device, including a current transformer for collecting the engine output current and a control unit electrically connected to the current transformer, the control unit processes the electrical signal output by the current transformer and controls the operation of an alarm indicator and a pulse generator, the alarm indicator is used to indicate whether the generator output current exceeds the rated value, and the pulse generator is used to output a pulse square wave signal to the engine electronic control unit or other vehicle electronic control unit.

[0005] Preferably, the control unit is provided with a power supply module 1 for powering the current transformer, a power supply module 2 for driving the alarm indicator and powering the pulse generator, a configuration switch for selecting a suitable gear to adapt to generators with different rated outputs, a relay for controlling the working status of the alarm indicator and the pulse generator, and a switching circuit for controlling the on and off of the relay.

[0006] Preferably, when the generator output current exceeds the rated current, the current transformer output signal increases, and the signal amplified by the amplifier circuit controls the switching circuit to conduct, causing the relay to energize, and the power supply module 2 drives the alarm indicator to alarm and supply power to the pulse generator, and the pulse generator outputs a pulse square wave signal to the engine electronic control unit or other vehicle electronic control unit.

[0007] Preferably, the power module 1 and the power module 2 are both linear regulators, and the power module 1 and the power module 2 are used to convert the VCC voltage into 12V and 5V respectively.

[0008] Preferably, the switch circuit is a four-way triode control circuit; the configuration switch is a four-speed shift switch, corresponding to four commonly used generator rated output parameter specifications of 50A, 70A, 100A, and 120A respectively.

[0009] Preferably, the pulse generator is a NE555 timer, which can operate in an unstable state according to the peripheral circuit connection to form a multivibrator to output a square wave signal; and the alarm indicator is an alarm indicator light.

[0010] Preferably, a connecting harness 1 is connected between the current transformer and the control unit, and the control unit is further connected to an engine electronic control unit or other vehicle electronic control units via a connecting harness 2.

[0011] Preferably, the control unit further comprises an amplifying circuit for amplifying the electrical signal output by the current transformer to a state required by a lower-level circuit.

[0012] Preferably, the engine electronic control unit or the vehicle electronic control unit can calculate the over-rated output duration by the following logic:

[0013] t=0.693×(R 13 +2R 14 )×C6×α

[0014] Among them, R13 / R14 are the timer charging current limiting resistors; C6 is the timer charging and discharging capacitors; α is the number of square wave cycles, and for a general controller, the count is triggered after capturing the first input rising edge.

[0015] In summary, the present invention includes the following beneficial technical effects:

[0016] The device of the present invention effectively solves the problem that the generator output current state cannot be transmitted to the engine or vehicle electronic control unit. When the alarm state is triggered, the device will output an electrical signal to the engine electronic control unit. After the electronic control unit collects this signal, it can record the alarm state and the over-rated output duration, or send this state to other units of the vehicle (such as instruments, etc.), thereby helping users or designers and maintenance personnel to timely understand the use of the generator and formulate subsequent response strategies and plans.

[0017] The device of the present invention has the advantage of a multi-gear design, and can be configured by adjusting the multi-gear switch to be suitable for generators with different rated outputs. This means that for generators with different output current specifications, only the corresponding gear needs to be adjusted without replacing the control unit, which greatly improves the applicability and flexibility of the device.

[0018] The device of the present invention can output the duration of over-rated working condition, and send square waves to the engine electronic control unit or vehicle electronic control unit in the form of periodic pulses through a pulse generator. The electronic control unit calculates the duration of over-rated working condition based on these signals, thereby helping generator engineers evaluate the impact on hardware and providing an important basis for subsequent maintenance and optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A system diagram of a generator output alarm device for an engine of the present invention;

[0020] Figure 2 It is a device assembly diagram of a generator output alarm device of an engine of the present invention;

[0021] Figure 3 The present invention is a schematic diagram of a control unit of a generator output alarm device for an engine.

[0022] Figure numerals: 1. Current transformer; 2. Control unit; 21. Power module 1; 22. Power module 2; 23. Configuration switch; 24. Switch circuit; 25. Relay; 26. Timer; 27. Alarm indicator light; 3. Connection harness 1; 4. Connection harness 2. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] The embodiment of the present invention discloses a generator output alarm device for an engine, comprising a current transformer 1, a control unit 2, a connection harness 1 3 and a connection harness 2 4. The control unit 2 comprises a power module 1 21, a power module 2 22, a configuration switch 23, a switch circuit 24, a relay 25, a timer 26 and an alarm indicator light 27.

[0025] The power module 1 21 obtains the VCC power supply, which is usually 24V, through the connection harness 2 4, and after conversion, it supplies power to the current transformer 1 through the connection harness 1 3. The primary side of the current transformer 1 collects the charging output current of the external generator B+, and outputs the electrical signal to the amplifier circuit in the control unit 2 after conversion through the secondary side. The amplifier circuit amplifies the input signal to the state required by the lower circuit and outputs it to the configuration switch 23. The configuration switch 23 is a multi-gear shift switch, which corresponds to the four commonly used generator rated output parameter specifications of 50A, 70A, 100A, and 120A. Select the appropriate gear by shifting the gear, output the signal to the lower switch circuit 24 of the given gear, and control the on and off of the switch circuit 24.

[0026] When the generator output current exceeds the rated current, the signal output by the current transformer 1 increases, and the signal amplified by the amplifier circuit controls the switch circuit 24 to conduct, so that the relay 25 is attracted. After the relay 25 is attracted, the power module 22 drives the alarm indicator 27 to light up, and at the same time supplies power to the timer 26. After the timer 26 is powered, it works in an unstable state according to the connection state of the external circuit, forming a multivibrator, and the output pulse square wave signal is transmitted to the engine electronic control unit or other vehicle electronic control unit through the connection harness 24 to help record the generator over-rated output status and duration.

[0027] The engine ECU or vehicle ECU can calculate the duration of over-rated output by the following logic:

[0028] t=0.693×(R 13 +2R 14 )×C6×α

[0029] Among them, R13 / R14 are charging current limiting resistors of timer 26; C6 is charging and discharging capacitor of timer 26; α is the number of square wave cycles, and for a general controller, the count is triggered after capturing the first input rising edge.

[0030] The power module 1 21 is a linear regulator, which is used to convert the VCC voltage into 12V to power the current transformer 1. The power module 2 22 is a linear regulator, which is used to convert the VCC voltage into 5V to drive the alarm indicator 27 and power the timer 26. The switch circuit 24 is a four-way transistor control circuit, and the timer 26 is a NE555 timer. According to the peripheral circuit connection, it can work in an unstable state to form a multivibrator to output a square wave signal.

[0031] The configuration switch 23 sets the gear in advance and selects the appropriate gear according to the rated output parameters of the generator to adapt to generators with different rated outputs. The switch circuit 24 controls the contact and disconnection of the relay 25 according to the selection of the configuration switch 23, thereby realizing the lighting of the alarm indicator 27 and the power supply of the timer 26. The alarm indicator 27 is used to indicate the state that the output current of the generator exceeds the rated value, and the pulse square wave signal output by the timer 26 is used to record the duration of the over-rated output.

[0032] The alarm device collects the generator output current through the current transformer 1, and controls the closing and disconnection of the relay 25 after processing by the amplification circuit and the configuration switch 23, so as to realize the monitoring and alarm functions of the generator output current. At the same time, the pulse square wave signal output by the timer 26 transmits the state and duration of the over-rated output to the engine electronic control unit or other vehicle electronic control unit, so as to help users or maintenance personnel to timely understand the use of the generator and formulate corresponding response strategies.

[0033] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine generator output alarm device, characterized in that: The invention comprises a current transformer (1) for collecting the output current of an engine and a control unit (2) electrically connected to the current transformer (1), wherein the control unit (2) processes the electrical signal output by the current transformer (1) and controls the operation of an alarm indicator and a pulse generator, wherein the alarm indicator is used to indicate whether the output current of the generator exceeds the rated value, and the pulse generator is used to output a pulse square wave signal to an engine electronic control unit or other vehicle electronic control units.

2. The generator output alarm device of an engine according to claim 1, characterized in that: The control unit (2) is provided with a power module 1 (21) for supplying power to the current transformer (1), a power module 2 (22) for driving the alarm indicator and supplying power to the pulse generator, a configuration switch for selecting a suitable gear to adapt to generators with different rated outputs, a relay (25) for controlling the working state of the alarm indicator and the pulse generator, and a switch circuit (24) for controlling the on and off of the relay (25).

3. The generator output alarm device of an engine according to claim 2, characterized in that: When the generator output current exceeds the rated current, the output signal of the current transformer (1) increases, and the signal amplified by the amplifier circuit controls the switch circuit (24) to conduct, causing the relay (25) to close, and the power module 2 (22) drives the alarm indicator to alarm and supply power to the pulse generator, and the pulse generator outputs a pulse square wave signal to the engine electronic control unit or other vehicle electronic control unit.

4. The generator output alarm device of an engine according to claim 2 or 3, characterized in that: The power module one (21) and the power module two (22) are both linear regulators, and the power module one (21) and the power module two (22) are used to convert the VCC voltage into 12V and 5V respectively.

5. The generator output alarm device of an engine according to claim 2 or 3, characterized in that: The switch circuit (24) is a four-way triode control circuit; the configuration switch (23) is a four-speed shift switch, corresponding to four commonly used generator rated output parameter specifications of 50A, 70A, 100A and 120A respectively.

6. The generator output alarm device of an engine according to claim 1, 2 or 3, characterized in that: The pulse generator is a NE555 timer (26), which can work in an unstable state according to the peripheral circuit connection to form a multivibrator to output a square wave signal; the alarm indicator is an alarm indicator light (27).

7. A generator output alarm device for an engine according to claim 1, 2 or 3, characterized in that: A connection harness 1 (3) is connected between the current transformer (1) and the control unit (2), and the control unit (2) is further connected to an engine electronic control unit or other vehicle electronic control units via a connection harness 2 (4).

8. The generator output alarm device of an engine according to claim 1, 2 or 3, characterized in that: The control unit (2) also includes an amplifying circuit, which is used to amplify the electrical signal output by the current transformer (1) to a state required by a lower-level circuit.

9. The generator output alarm device of an engine according to claim 1, 2 or 3, characterized in that: The engine ECU or vehicle ECU can calculate the duration of over-rated output by the following logic: t=0.693×(R 13 +2R 14 )×C6×α Wherein, R13 / R14 are charging current limiting resistors of the timer (26); C6 is charging and discharging capacitors of the timer (26); α is the number of square wave cycles, and for a general controller, the count is triggered after capturing the first input rising edge.

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