Water inlet protection circuit for automobile engine

Abstract

The utility model provides a water inlet protection circuit for an automobile engine, which comprises a first relay (J1) respectively connected with a buzzer (H), a key door and an automobile power supply; and the water inlet control circuit is respectively connected with the first relay (J1) and the automobile power supply, and when water enters the air inlet channel of the engine, the first relay (J1) is controlled to disconnect the key door and the automobile power supply, and the automobile power supply and the buzzer (H) are connected to give an alarm. The two probes are additionally arranged in the air inlet channel of the engine, when water enters the air inlet channel, due to the electrical conductivity of the water, a small amount of current triggers optical coupling to control the relay to disconnect an automobile key door so as to prevent accidents, installation is convenient, and modification on an internal circuit of an automobile is small.

Description

Technical Field

[0001] The utility model relates to the technical field of traffic safety early warning, in particular to a water ingress protection circuit for automobile engines. Background Art

[0002] Automobile engines require air and fuel to operate. The combustion air enters the engine through the air filter. However, during rainy weather, water can easily enter the engine's intake system. This accumulated water can then enter the engine, causing it to stall. Worse still, water in the engine can damage the engine due to its incompressibility. The consequences of water in the engine are severe: A small amount of water enters the cylinders and mixes with the engine oil, degrading the oil quality. The water-laden oil can increase wear on engine components, potentially leading to increased noise and vibration during driving. The most serious issue is that the engine may stall after a few seconds of restarting, or even fail to start again after repeated attempts. Because water is incompressible, the engine continues to operate at high speed even after entering the cylinders. This inability to compress the water during power generation can lead to valve and connecting rod bending, piston seizure, severe cylinder block wear, and crankshaft bending. Inexperienced drivers often simply restart the engine, resulting in significant financial losses. Utility Model Content

[0003] In order to solve the above problems, the purpose of this utility model is to provide a car engine water ingress protection circuit.

[0004] To achieve the above purpose, the present invention provides the following solutions:

[0005] A car engine water ingress protection circuit, comprising:

[0006] The first relay J1 is connected to the buzzer H, key door and car power supply respectively;

[0007] The water inlet control circuit is connected to the first relay J1 and the vehicle power supply respectively. When water enters the engine intake duct, the first relay J1 is controlled to disconnect the key door from the vehicle power supply, and connect the vehicle power supply and the buzzer H to sound an alarm.

[0008] Preferably, the water inlet control circuit includes:

[0009] A DC / DC converter, wherein the positive input terminal of the DC / DC converter is connected to the positive electrode of the vehicle power supply, the negative input terminal of the DC / DC converter is connected to the negative electrode of the vehicle power supply, the positive output terminal of the DC / DC converter is connected to the first probe Q1, and the negative output terminal of the DC / DC converter is connected to one end of the resistor;

[0010] an optical coupler, wherein a first end of the optical coupler is connected to the second probe Q2, a second end of the optical coupler is connected to the other end of the resistor, a third end of the optical coupler is connected to the positive electrode of the vehicle power supply, and a fourth end of the optical coupler is connected to the second relay J2;

[0011] The first relay J1 and the second relay J2 are the same relay switch. J1 is the action end connected to the car power supply, buzzer H, and key door normally closed respectively; J2 is a relay, and the fourth end is connected to the buzzer H circuit after being energized and triggered.

[0012] The first probe Q1 and the second probe Q2 are arranged between the air intake duct of the automobile engine. When water enters the air intake duct, the first probe Q1 and the second probe Q2 are connected, and the DC / DC converter powers the optocoupler. The optocoupler controls the second relay J2 and the first relay J1 to disconnect from the key door and connect the circuit with the buzzer H to sound an alarm.

[0013] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0014] The utility model provides a circuit for protecting automobile engines from water ingress. Compared with the prior art, the utility model adds two probes in the air intake duct of the engine. When water enters the air intake duct, due to the conductivity of water, a small amount of current will trigger an optical coupling, thereby controlling a relay to disconnect the automobile key door to prevent accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 The utility model provides a circuit diagram of automobile engine water ingress protection. DETAILED DESCRIPTION

[0017] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0018] To achieve the above purpose, the present invention provides the following solutions:

[0019] See also Figure 1 , a car engine water ingress protection circuit, comprising:

[0020] The first relay J1 is connected to the buzzer H, key door and car power supply respectively;

[0021] The water inlet control circuit is connected to the first relay J1 and the vehicle power supply respectively. When water enters the engine intake duct, the first relay J1 is controlled to disconnect the key door from the vehicle power supply, and connect the vehicle power supply and the buzzer H to sound an alarm.

[0022] When water enters a car engine, the incompressibility of water can cause damage to the engine cylinder during the compression stroke of the engine. The purpose of the utility model is to detect when water enters the engine and shut down the engine in time to protect the car engine.

[0023] The proposed technique involves adding two probes to the intake duct. When water enters the duct, the water's conductivity triggers a relay to disconnect the key, achieving the desired effect. However, given the extremely low conductivity of water in practice, the resulting current is too small to disconnect the relay, thus failing to achieve the desired effect. To address this, an optical coupler was added to the circuit, allowing for even weaker currents to achieve the desired effect.

[0024] Furthermore, the water inlet control circuit includes: a DC / DC converter, an optical coupler, a second relay J2, a first probe Q1 and a second probe Q2.

[0025] The positive input terminal of the DC / DC converter is connected to the positive terminal of the car power supply, the negative input terminal of the DC / DC converter is connected to the negative terminal of the car power supply, the positive output terminal of the DC / DC converter is connected to the first probe Q1, and the negative output terminal of the DC / DC converter is connected to one end of the resistor;

[0026] A first end of the optical coupler is connected to the second probe Q2, a second end of the optical coupler is connected to the other end of the resistor, a third end of the optical coupler is connected to the positive electrode of the car power supply, and a fourth end of the optical coupler is connected to the second relay J2;

[0027] The first relay J1 is connected to the car power supply, buzzer H, and key door respectively;

[0028] The first probe Q1 and the second probe Q2 are arranged between the air intake duct of the automobile engine. When water enters the air intake duct, the first probe Q1 and the second probe Q2 are connected, and the DC / DC converter powers the optocoupler. The optocoupler controls the second relay J2 and the first relay J1 to disconnect from the key door and connect the circuit with the buzzer H to sound an alarm. When there is no water as a medium between the two probes, the key door is connected normally and does not affect the operation of the engine.

[0029] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0030] The utility model provides a circuit for protecting automobile engines from water ingress. Compared with the prior art, the utility model adds two probes in the air intake duct of the engine. When water enters the air intake duct, due to the conductivity of water, a small amount of current will trigger an optical coupling and then control a relay to disconnect the automobile key door to prevent accidents. The utility model is easy to install and requires little modification to the internal circuit of the automobile.

[0031] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help you understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A car engine water ingress protection circuit, characterized in that: include: The first relay (J1) is connected to the buzzer (H), key door and car power supply respectively; a water inlet control circuit, connected to the first relay (J1) and the vehicle power supply, respectively, and controlling the first relay (J1) to disconnect the key door from the vehicle power supply and connect the vehicle power supply and the buzzer (H) to sound an alarm when water enters the engine intake passage; The water inlet control circuit comprises: a DC / DC converter, wherein the positive input terminal of the DC / DC converter is connected to the positive electrode of the vehicle power supply, the negative input terminal of the DC / DC converter is connected to the negative electrode of the vehicle power supply, the positive output terminal of the DC / DC converter is connected to the first probe (Q1), and the negative output terminal of the DC / DC converter is connected to one end of a resistor; an optical coupler, wherein a first end of the optical coupler is connected to a second probe (Q2), a second end of the optical coupler is connected to the other end of the resistor, a third end of the optical coupler is connected to a positive electrode of a car power supply, and a fourth end of the optical coupler is connected to a second relay (J2); The first relay (J1) is connected to the car power supply, buzzer (H), and key door respectively; The first probe (Q1) and the second probe (Q2) are arranged between the intake duct of the automobile engine. When water enters the intake duct, the first probe (Q1) and the second probe (Q2) are connected, and a DC / DC converter supplies power to the optocoupler. The optocoupler controls the second relay (J2) and the first relay (J1) to disconnect from the key door and connect to a circuit with a buzzer (H) to sound an alarm.

Images