Engine ECM dual-power-supply long-delay power-off circuit
Patent Information
- Application Number
- CN202410519735.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2025-11-04
Smart Images
Figure CN120896077A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of engine control circuits, specifically to a dual-power supply long-delay power-off circuit for an engine ECM. Background Technology
[0002] Currently, the underground loader (hereinafter referred to as the vehicle) is powered by the first battery G1 through the battery switch S1. When the vehicle is turned off, the driver will rotate the battery switch S1 after a few seconds to disconnect the first battery G1 from the vehicle, putting the vehicle in a power-off state. For a Euro III engine, it takes a few seconds for the ECM to complete data storage from engine shutdown. Therefore, from the time the vehicle is turned off until the driver disconnects the battery switch S1, there is enough time for the engine ECM to store the data. However, for a Euro IV engine, in addition to storing data, the urea in the aftertreatment pipeline and urea pump also needs to be disposed of after shutdown. Therefore, a longer time is required to ensure that the battery switch S1 is disconnected. The second battery G2 still supplies power to the engine ECM, and the second battery G2 is not allowed to continuously supply power to the ECM, otherwise the second battery G2 will be depleted when the vehicle is parked for a long time. Currently, the longest power-off delay time of time relays without auxiliary power is 10 minutes, and the longest power-off delay time of time relays with auxiliary power is 300 hours. Therefore, this invention proposes a dual power supply long delay power-off circuit for the engine ECM. After the driver turns off the engine and rotates the battery switch S1 to disconnect the first battery G1, power is supplied to the ECM to ensure the normal operation of the ECM's stored data and the engine after-treatment device. Summary of the Invention
[0003] (a) Technical problems to be solved
[0004] To address the shortcomings of existing technologies, this invention provides a dual-power supply long-delay power-off circuit for the engine ECM. The purpose of this circuit is to provide a dual-power supply long-delay power-off circuit for the engine ECM, ensuring that even after the battery switch S1 disconnects the first battery G1, the second battery G2 continues to supply power to the ECM for a set time (>10 minutes). Once the set time (>10 minutes) is reached, the second battery G2 is automatically disconnected. This ensures that after the driver turns off the engine and rotates the battery switch S1 to disconnect the first battery G1, power is supplied to the ECM, guaranteeing the normal operation of ECM data storage and engine after-processing devices. This achieves automatic activation of the second battery G2 after the driver disconnects the battery switch S1, supplying power to the engine ECM and ensuring that engine data storage and engine after-processing continue to operate for a certain period. Finally, after the engine data storage and after-processing operations are completed, the second battery G2 is automatically disconnected, preventing battery depletion when the vehicle is parked for an extended period.
[0005] (II) Technical Solution
[0006] To achieve the above objectives, the present invention provides the following technical solution: a dual-power supply long-delay power-off circuit for an engine ECM, wherein the power-off circuit includes a first battery G1 and a second battery G2, a battery switch S1, a first relay KT1, a second relay KT2, a third relay KT3, a fourth relay K1, a fifth relay K2, a key switch S2, a starter motor M, and an engine ECM.
[0007] Preferably, the first battery G1 is the main battery, which supplies power to the starter motor M and the ECM, and the second battery G2 is the auxiliary battery, which supplies power to the ECM after the battery switch S1 disconnects the first battery G1.
[0008] Preferably, the function of the battery switch S1 is to isolate the first battery G1 from the circuit after the vehicle is turned off.
[0009] Preferably, the first relay KT1 is a time-delay power-off relay that requires an auxiliary power supply and has a delay of 0.05s to 300h; the second relay KT2 is a time-delay power-off relay that does not require an auxiliary power supply and has a delay of 0.05s to 10min; the third relay KT3 is a time-delay power-on relay that does not require an auxiliary power supply and has a delay of 0.05s to 300h; the fourth relay K1 is a 50A power relay; and the fifth relay K2 is a 50A power relay.
[0010] Preferably, the starter motor M is used to start the engine, and the engine ECM is an engine control unit.
[0011] Preferably, in the engine ECM dual power supply long delay power-off circuit, after the vehicle is turned off, the driver will immediately disconnect the battery switch S1 to lock the vehicle.
[0012] Preferably, the wires connected to the second battery of the engine ECM dual power supply long delay power-off circuit are insufficient to support the starter motor M to start.
[0013] Preferably, the purpose of KT1 in the dual power supply long delay power-off circuit of the engine ECM is to delay for 22 minutes, the purpose of KT2 is to give the control terminal of KT1 a falling delay trigger signal after 2 seconds, and the purpose of KT3 is to control K2 to be turned on after a 5-minute delay. Since the wires of K2 and K1 are 4-flat, it is to prevent a large starting current from the auxiliary battery to the starter motor when G1 has poor contact.
[0014] Working principle: During the start-up process, the relay circuit closes the battery switch S1, and the first battery G1 supplies power to the starter motor M and the engine ECM. Simultaneously, the coils A1 and A2 of the first relay KT1 are energized. When the key switch is rotated to the upper potential 15 / 54, the coils A1 and A2 of the second relay KT2 are energized, and contacts 15-18 of the second relay KT2 close. At this time, the control point Y of the first relay KT1 coil is energized, and contacts 15-18 of the first relay KT1 close. At this time, the coil 8 of the fourth relay K1... When 6-85 is energized, contacts 30-87 of the fourth relay K1 close. At this time, although coils A1 and A2 of the third relay KT3 are energized, since the third relay KT3 is a time-delay relay, contacts 15-18 of the third relay KT3 close after a set time. Coils 86-85 of the fifth relay K2 are energized, and contacts 30-87 of the fifth relay K2 close. This prevents a large current from the starter motor from passing through the contacts of the fourth relay K1 and the fifth relay K2, which could burn out the wires and contacts, should the first battery have poor contact. In other words, if the first battery is damaged or the cable has poor contact, the second battery G2 is not allowed to drive the starter motor M. If everything is normal, the key switch S2 is rotated to the start position 50a, the starter motor M receives the start signal, and the starter motor M rotates, starting the engine.
[0015] During the process of turning off the engine and disconnecting the circuit breaker, the driver turns the key switch S2 to the off position and disconnects the battery switch S1 according to operating habits. At this time, the coil A1A2 of the second relay KT2 is de-energized, and the contacts 15-18 of the second relay KT2 open after a set delay time (set to 2 seconds). Since the second battery G2 is still supplying power to the coil A1A2 of the first relay KT1 through the fifth relay K2 and the fourth relay K1, and a falling edge appears at the control terminal Y of the first relay KT1, the contacts 15-18 of the first relay KT1 open after a set delay time (set to 22 minutes). At this time, the coil 86-85 of the fourth relay K1 is de-energized, and the contacts 30-87 of the fourth relay K1 open. The coil A1A2 of the third relay KT3 is de-energized, and the contacts 15-18 of the third relay KT3 open. The coil 86-85 of the fifth relay K2 is de-energized, and the contacts 30-87 of the fifth relay K2 open. At this time, the second battery G2 is disconnected from the circuit and no longer supplies power to the vehicle.
[0016] (III) Beneficial Effects
[0017] This invention provides a dual-power supply long-delay power-off circuit for an engine ECM. It has the following advantages:
[0018] This invention provides a dual-power supply long-delay power-off circuit for an engine ECM. The purpose of this circuit is to provide a dual-power supply long-delay power-off circuit for an engine ECM, ensuring that even after the battery switch S1 disconnects the first battery G1, the second battery G2 continues to supply power to the ECM for a set time (>10 minutes). Once the set time (>10 minutes) is reached, the second battery G2 is automatically disconnected. This ensures that after the driver turns off the engine and rotates the battery switch S1 to disconnect the first battery G1, power is supplied to the ECM, guaranteeing the normal operation of the ECM's data storage and engine after-treatment devices. This achieves automatic activation of the second battery G2 after the driver disconnects the battery switch S1, supplying power to the engine ECM and ensuring that engine data storage and engine after-treatment continue to operate for a certain period. Finally, after the engine data storage and after-treatment operation is completed, the second battery G2 is automatically disconnected, preventing battery depletion when the vehicle is parked for an extended period. Attached Figure Description
[0019] Figure 1 This is a circuit control schematic diagram of a dual-power supply long-delay power-off circuit for an engine ECM according to the present invention. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of this application, it should be noted that the terminology used herein is only for describing specific implementations and is not intended to limit the exemplary implementations according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings indicate similar items, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0021] Example 1:
[0022] like Figure 1As shown, this embodiment of the invention provides a dual-power-supply long-delay power-off circuit for an engine ECM. The power-off circuit includes a first battery G1 and a second battery G2, a battery switch S1, a first relay KT1, a second relay KT2, a third relay KT3, a fourth relay K1, and a fifth relay K2, a key switch S2, a starter motor M, and an engine ECM. The first battery G1 is the main battery, supplying power to the starter motor M and the ECM. The second battery G2 is an auxiliary battery, supplying power to the ECM after the first battery G1 is disconnected by the battery switch S1. The function of the battery switch S1 is to isolate the first battery G1 from the circuit after the vehicle is turned off. The first relay KT1 is a time-delay power-off relay, requiring auxiliary power, with a delay of 0.05s…300h. The second relay KT2 is a time-delay power-off relay, not requiring auxiliary power. The auxiliary power supply has a delay of 0.05s to 10 minutes. The third relay, KT3, is a time-delayed power-on relay that does not require auxiliary power and has a delay of 0.05s to 300 hours. The fourth relay, K1, is a 50A power relay. The fifth relay, K2, is also a 50A power relay. The starter motor M is used to start the engine. The engine ECM is the engine control unit. After the vehicle is turned off, the driver will immediately disconnect the battery switch S1 to lock the vehicle. The wires connected to the second battery in the engine ECM dual-power long-delay power-off circuit are insufficient to support the starter motor M. The purpose of KT1 in the engine ECM dual-power long-delay power-off circuit is to delay for 22 minutes. The purpose of KT2 is to provide a falling delay trigger signal to the control terminal of KT1 after 2 seconds. The purpose of KT3 is to control K2 to be turned on after a 5-minute delay. Since the wires of K2 and K1 are 4mm flat, it is to prevent a large starting current from the auxiliary battery to the starter motor in case of poor contact of G1.
[0023] Analysis of the start-up principle: When the relay circuit closes the battery switch S1, the first battery G1 supplies power to the starter motor M and the engine ECM. Simultaneously, the coils A1 and A2 of the first relay KT1 are energized. When the key switch is rotated to the upper potential 15 / 54, the coils A1 and A2 of the second relay KT2 are energized, and contacts 15-18 of the second relay KT2 close. At this time, the control point Y of the first relay KT1 coil is energized, and contacts 15-18 of the first relay KT1 close. At this point, the coils 86-85 of the fourth relay K1 are energized. When the power is applied, contacts 30-87 of the fourth relay K1 close. At this time, although coils A1 and A2 of the third relay KT3 are energized, because the third relay KT3 is a time-delay relay, contacts 15-18 of the third relay KT3 close after a set time. This energizes coils 86-85 of the fifth relay K2, causing contacts 30-87 of the fifth relay K2 to close. This prevents a large current from flowing through the contacts of the fourth and fifth relays K1 and K2, potentially burning out the wires and contacts, should the first battery have poor contact. In other words, if the first battery is damaged or the cable has poor contact, the second battery G2 is not allowed to drive the starter motor M. If everything is normal, the key switch S2 is rotated to the start position 50a. The starter motor M receives the start signal, rotates, and starts the engine.
[0024] Analysis of the engine shutdown and tripping process: The driver turns the key switch S2 to the off position and disconnects the battery switch S1 according to operating habits. At this time, the coil A1A2 of the second relay KT2 is de-energized, and the contacts 15-18 of the second relay KT2 open after a set delay time (set to 2 seconds). Since the second battery G2 is still supplying power to the coil A1A2 of the first relay KT1 through the fifth relay K2 and the fourth relay K1, and a falling edge appears at the control terminal Y of the first relay KT1, the contacts 15-18 of the first relay KT1 open after a set delay time (set to 22 minutes). At this time, the coil 86-85 of the fourth relay K1 is de-energized, and the contacts 30-87 of the fourth relay K1 open. The coil A1A2 of the third relay KT3 is de-energized, and the contacts 15-18 of the third relay KT3 open. The coil 86-85 of the fifth relay K2 is de-energized, and the contacts 30-87 of the fifth relay K2 open. At this time, the second battery G2 is disconnected from the circuit and no longer supplies power to the vehicle.
[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A dual-power supply long-delay power-off circuit for an engine ECM, characterized in that: The power-off circuit includes the following electrical components: a first battery G1 and a second battery G2; a battery switch S1; a first relay KT1, a second relay KT2, a third relay KT3, a fourth relay K1, and a fifth relay K2; a key switch S2; a starter motor M; and an engine ECM.
2. The engine ECM dual-power supply long-delay power-off circuit according to claim 1, characterized in that: The first battery G1 is the main battery, which supplies power to the starter motor M and the ECM. The second battery G2 is the auxiliary battery, which supplies power to the ECM after the battery switch S1 disconnects the first battery G1.
3. The engine ECM dual-power supply long-delay power-off circuit according to claim 1, characterized in that: The function of the battery switch S1 is to isolate the first battery G1 from the circuit after the vehicle is turned off.
4. The engine ECM dual-power supply long-delay power-off circuit according to claim 1, characterized in that: The first relay KT1 is a time-delay power-off relay that requires an auxiliary power supply and has a delay of 0.05s to 300h. The second relay KT2 is a time-delay power-off relay that does not require an auxiliary power supply and has a delay of 0.05s to 10min. The third relay KT3 is a time-delay power-on relay that does not require an auxiliary power supply and has a delay of 0.05s to 300h. The fourth relay K1 is a 50A power relay. The fifth relay K2 is a 50A power relay.
5. The engine ECM dual-power supply long-delay power-off circuit according to claim 1, characterized in that: The starter motor M is used to start the engine, and the engine ECM is the engine control unit.
6. The engine ECM dual-power supply long-delay power-off circuit according to claim 1, characterized in that: The aforementioned engine ECM dual power supply long-delay power-off circuit allows the driver to immediately disconnect the battery switch S1 and lock the vehicle after the engine is turned off.
7. The engine ECM dual-power supply long-delay power-off circuit according to claim 1, characterized in that: The wires connected to the second battery of the engine ECM dual power supply long delay power-off circuit are insufficient to support the starter motor M to start.
8. The engine ECM dual-power supply long-delay power-off circuit according to claim 1, characterized in that: The purpose of KT1 in the engine ECM dual power supply long delay power-off circuit is to delay for 22 minutes. The purpose of KT2 is to give the control terminal of KT1 a falling delay trigger signal after 2 seconds. The purpose of KT3 is to control K2 to be turned on after a 5-minute delay. Since the K2 and K1 wires are 4-flat, it is to prevent a large starting current from the auxiliary battery to the starter motor when G1 has poor contact.