A method for detecting engine water jacket leakage

Abstract

The present invention discloses a method for detecting air leakage in an engine water jacket. The method comprises judging whether the engine water jacket is normal or leaking according to a water flow rate signal, a water inlet pressure signal and a water outlet pressure signal. If there is a leak, a safety alarm is issued; if it is normal, no safety alarm is issued. The present invention can judge whether the engine water jacket is leaking in advance, thereby preventing a greater degree of engine damage caused by air leakage in the engine water jacket.

Description

Technical Field

[0001] The invention belongs to the technical field of engine water jacket leakage detection, and in particular relates to an engine water jacket leakage detection method. Background Art

[0002] As an important part of the engine cooling system, the engine water jacket mainly provides a flow channel for the engine coolant and reduces the temperature of key components such as the cylinder head and combustion chamber through wall heat exchange. When the engine water jacket leaks the combustion chamber gas into the engine water jacket due to manufacturing defects, component fatigue and cracks, it will not only increase the engine water jacket pressure and cause pipeline seal damage and leakage; but also reduce the flow of engine circulating coolant due to the increase of gas in the water jacket, affecting the heat dissipation and cooling of the engine, and further affecting the normal operation of the engine, and in severe cases, the engine will be damaged.

[0003] The current engine water jacket is designed with a degassing port, which is connected to the vehicle auxiliary water tank by a pipeline, and a pressure cap is installed on the vehicle auxiliary water tank. Normally, the engine water jacket gas is mainly degassed through the vehicle auxiliary water tank. When the water jacket gas is small, the water jacket gas is discharged through the vehicle auxiliary water tank pressure cap; when the vehicle auxiliary water tank pressure exceeds the pressure cap setting value, exhaust treatment is performed, that is, when the water jacket leaks a lot, the vehicle auxiliary water tank will spray water and other phenomena.

[0004] The engine of the above-mentioned prior art is mainly degassed through the vehicle auxiliary water tank pressure cap, but there is no water jacket leakage detection function. Moreover, the system indirectly judges whether the engine water jacket is leaking, which is often only manifested when the engine water jacket leaks a lot, and the engine failure is serious at this time. Therefore, the engine water jacket should be tested in real time to determine whether the engine water jacket is normal as early as possible. The earlier the water jacket is judged to leak, the less damage to the engine and the lower the maintenance cost. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and provide a method for detecting engine water jacket leakage.

[0006] The technical solution adopted by the present invention is: an engine water jacket leakage detection method, comprising an engine water jacket leakage detection system, the engine water jacket leakage detection system comprising

[0007] The first pipeline is used to connect the engine water jacket and the auxiliary water tank of the vehicle;

[0008] The second pipeline is used to connect the engine water jacket and the outlet of the cooling heat exchanger;

[0009] The third pipeline is used to connect the engine water jacket and the inlet of the cooling heat exchanger;

[0010] An engine water pump is arranged on the second pipeline;

[0011] A water flow meter is provided on the second pipeline and is used to obtain a water flow signal;

[0012] Also includes

[0013] The fourth pipeline is used to connect the auxiliary water tank of the vehicle with the front end of the water flow meter and the outlet of the cooling heat exchanger;

[0014] A water inlet pressure sensor is provided at the connection between the fourth pipeline and the second pipeline, and is used to obtain a water inlet pressure signal;

[0015] The water outlet pressure sensor is arranged on the third pipeline and is used to obtain the water outlet pressure signal;

[0016] The engine ECU is used to judge whether the engine water jacket is normal or leaking according to the water flow signal, water inlet pressure signal and water outlet pressure signal. If it is leaking, a safety alarm will be issued; if it is normal, no safety alarm will be issued;

[0017] The engine water jacket leakage detection method comprises the following steps:

[0018] Set the standard value of water inlet pressure P1, water outlet pressure P2 and water flow rate Q0;

[0019] When the engine is normal, measure the water inlet pressure P in real time. 进水 , water outlet pressure P 回水 and water flow rate Q;

[0020] When the real-time measured water inlet pressure P 进水 = standard value of water inlet pressure P1, real-time measured water outlet pressure P 回水 = standard value of water outlet pressure P2, and the real-time measured water flow Q = standard value of water flow Q0, then the engine water jacket is judged to be normal;

[0021] When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is within 10% higher or lower than the standard value of water inlet pressure P1. 回水 If the water outlet pressure is higher or lower than the standard value P2 by 10%, and the real-time measured water flow Q = the standard value Q0, the engine water jacket is judged to be normal;

[0022] When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is between 10% and 30% higher than the standard value of water inlet pressure P1. 回水 If the water outlet pressure is between 10% and 30% higher than the standard value P2, and the real-time measured water flow Q> the standard value Q0, the engine water jacket is judged to be normal;

[0023] When the real-time measured water inlet pressure P 进水> Standard value of water inlet pressure P1, real-time measured water outlet pressure P 回水 > standard value of water outlet pressure P2, and real-time measured water inlet pressure P 进水 and the real-time measured water outlet pressure P 回水 If the water flow Q measured in real time decreases by more than 30%, it is judged that the engine water jacket is leaking;

[0024] When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is higher than the standard value of water inlet pressure P1 by more than 30%. 回水 If it is higher than the standard value of water outlet pressure P2 by more than 30%, and there is water spraying from the auxiliary water tank pressure cap of the whole vehicle, it is judged that the engine water jacket is leaking.

[0025] The engine water jacket serves as a coolant circulation channel for heat exchange between engine body components and the coolant.

[0026] The engine water pump provides driving force for the flow of coolant in the cooling system, and is used to drive the coolant to circulate in the engine cooling system.

[0027] The water flow meter is used to measure the coolant flow when the engine is running.

[0028] The vehicle auxiliary water tank is a main component of the engine cooling system and is used to degas the cooling system. It also serves as a water storage tank to replenish coolant to the engine water inlet through an excitation pipe.

[0029] The water inlet pressure sensor is used to measure the water inlet pressure of the engine coolant system.

[0030] The cooling heat exchanger is a core component of the cooling system and is used for dissipating heat from the engine coolant.

[0031] The water outlet pressure sensor is used to measure the water outlet pressure of the engine coolant system.

[0032] The engine ECU is used as a control component to collect engine inlet and outlet water pressure and water flow signals, and transmit corresponding signals to the vehicle control panel after relevant processing.

[0033] The vehicle control panel safety alarm acts as an execution component and performs corresponding actions after receiving relevant execution signals.

[0034] The beneficial effects of the present invention are as follows:

[0035] 1. The present invention is based on "inlet and outlet water pressure and water flow rate" and can directly and accurately determine whether the engine water jacket is leaking by comparing the changes in the measured value and the standard value.

[0036] 2. The present invention forms 5 special situations by analyzing the changes in the inlet and outlet water pressures and water flow rates, and uses these as criteria to determine whether the engine water jacket is leaking.

[0037] 3. The present invention can determine whether the engine water jacket is leaking in advance, thereby preventing a greater degree of engine damage caused by the engine water jacket leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a connection diagram of the engine water jacket leakage detection system of the present invention;

[0039] Figure 2 It is a schematic diagram of the principle of the engine water jacket leakage detection method of the present invention.

[0040] In the figure: 1-engine water jacket, 2-engine water pump, 3-vehicle auxiliary water tank, 4-water flow meter, 5-water inlet pressure sensor, 6-cooling heat exchanger, 7-safety alarm, 8-engine ECU, 9-water outlet pressure sensor, a-first pipeline, b-second pipeline, c-third pipeline, d-fourth pipeline. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings 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.

[0042] like Figure 1 , Figure 2 As shown, the present invention provides an engine water jacket leakage detection method, including an engine water jacket leakage detection system, the engine water jacket leakage detection system includes

[0043] The first pipeline a is used to connect the engine water jacket 1 and the vehicle auxiliary water tank 3;

[0044] The second pipeline b is used to connect the engine water jacket 1 and the outlet of the cooling heat exchanger 6;

[0045] The third pipeline c is used to connect the engine water jacket 1 and the inlet of the cooling heat exchanger 6;

[0046] The engine water pump 2 is arranged on the second pipeline b;

[0047] A water flow meter 4 is provided on the second pipeline b and is used to obtain a water flow signal;

[0048] Also includes

[0049] The fourth pipeline d is used to connect the auxiliary water tank 3 of the whole vehicle with the front end of the water flow meter 4 and the outlet of the cooling heat exchanger 6;

[0050] The water inlet pressure sensor 5 is provided at the connection between the fourth pipeline d and the second pipeline b, and is used to obtain a water inlet pressure signal;

[0051] The outlet water pressure sensor 9 is provided on the third pipeline c and is used to obtain the outlet water pressure signal;

[0052] The engine ECU 8 is used to judge whether the engine water jacket 1 is normal or leaking according to the water flow signal, the water inlet pressure signal and the water outlet pressure signal. If it is leaking, a safety alarm is issued; if it is normal, no safety alarm is issued;

[0053] Specifically include:

[0054] Set the standard value of water inlet pressure P1, water outlet pressure P2 and water flow rate Q0;

[0055] When the engine is normal, measure the water inlet pressure P in real time. 进水 , water outlet pressure P 回水 and water flow rate Q;

[0056] When the real-time measured water inlet pressure P 进水 = standard value of water inlet pressure P1, real-time measured water outlet pressure P 回水 = standard value of water outlet pressure P2, and the real-time measured water flow Q = standard value of water flow Q0, then it is judged that the engine water jacket 1 is normal;

[0057] When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is within 10% higher or lower than the standard value of water inlet pressure P1. 回水 If the water outlet pressure is higher or lower than the standard value P2 by 10%, and the real-time measured water flow Q = the standard value Q0, then the engine water jacket 1 is judged to be normal;

[0058] When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is between 10% and 30% higher than the standard value of water inlet pressure P1. 回水 If the water outlet pressure is higher than the standard value P2 by 10%-30%, and the real-time measured water flow Q> the standard value Q0, then the engine water jacket 1 is judged to be normal;

[0059] When the real-time measured water inlet pressure P 进水 > Standard value of water inlet pressure P1, real-time measured water outlet pressure P 回水 > standard value of water outlet pressure P2, and real-time measured water inlet pressure P 进水 and the real-time measured water outlet pressure P 回水 If the water flow Q measured in real time decreases by more than 30%, it is judged that the engine water jacket 1 is leaking;

[0060] When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is higher than the standard value of water inlet pressure P1 by more than 30%. 回水 If it is higher than the standard value of water outlet pressure P2 by more than 30%, and there is water spraying from the auxiliary water tank pressure cover of the whole vehicle, it is judged that the engine water jacket 1 is leaking.

[0061] The engine water jacket 1 serves as a coolant circulation channel for heat exchange between engine body components and the coolant.

[0062] The engine water pump 2 provides driving force for the flow of coolant in the cooling system, and is used to drive the coolant to circulate in the engine cooling system.

[0063] The water flow meter 4 is used to measure the coolant flow when the engine is running.

[0064] The auxiliary water tank 3 of the whole vehicle is the main component of the engine cooling system, which is used to degas the cooling system; at the same time, it serves as a water storage tank to replenish the coolant to the engine water inlet through the excitation pipe.

[0065] The water inlet pressure sensor 5 is used to measure the water inlet pressure of the engine coolant system.

[0066] The cooling heat exchanger 6 is a core component of the cooling system and is used to dissipate heat from the engine coolant.

[0067] The water outlet pressure sensor 9 is used to measure the water outlet pressure of the engine coolant system.

[0068] The engine ECU 8 is used as a control component to collect the engine inlet and outlet water pressure and water flow signals, and transmit the corresponding signals to the vehicle control panel after relevant processing.

[0069] The vehicle control panel safety alarm acts as an executive component and takes corresponding actions after receiving relevant execution signals.

[0070] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A method for detecting engine water jacket leakage, characterized in that: It includes an engine water jacket leakage detection system, the engine water jacket leakage detection system includes The first pipeline is used to connect the engine water jacket and the auxiliary water tank of the vehicle; The second pipeline is used to connect the engine water jacket and the outlet of the cooling heat exchanger; The third pipeline is used to connect the engine water jacket and the inlet of the cooling heat exchanger; An engine water pump is arranged on the second pipeline; A water flow meter is provided on the second pipeline and is used to obtain a water flow signal; Also includes The fourth pipeline is used to connect the auxiliary water tank of the vehicle with the front end of the water flow meter and the outlet of the cooling heat exchanger; A water inlet pressure sensor is provided at the connection between the fourth pipeline and the second pipeline, and is used to obtain a water inlet pressure signal; The water outlet pressure sensor is arranged on the third pipeline and is used to obtain the water outlet pressure signal; The engine ECU is used to judge whether the engine water jacket is normal or leaking based on the water flow signal, water inlet pressure signal and water outlet pressure signal. If there is a leak, a safety alarm will be issued; If normal, no safety alarm will be issued; The engine water jacket leakage detection method comprises the following steps: Set the standard value of water inlet pressure P1, water outlet pressure P2 and water flow rate Q0; When the engine is normal, measure the water inlet pressure P in real time. 进水、 Water outlet pressure P 回水 and water flow Q; When the real-time measured water inlet pressure P 进水 = standard value of water inlet pressure P1, real-time measured water outlet pressure P 回水 = standard value of water outlet pressure P2, real-time measured water flow Q = standard value of water flow Q0, then the engine water jacket is judged to be normal; When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is within 10% higher or lower than the standard value of water inlet pressure P1. 回水 If the water outlet pressure is higher or lower than the standard value P2 by 10%, and the real-time measured water flow Q = the standard value Q0, the engine water jacket is considered normal; When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is between 10% and 30% higher than the standard value of water inlet pressure P1. 回水 If the water outlet pressure is higher than the standard value P2 by 10%-30%, and the real-time measured water flow Q> the standard value Q0, the engine water jacket is judged to be normal; When the real-time measured water inlet pressure P 进水 > Standard value of water inlet pressure P1, real-time measured water outlet pressure P 回水 > standard value of water outlet pressure P2, and real-time measured water inlet pressure P 进水 and the real-time measured water outlet pressure P 回水 If the water flow Q measured in real time decreases by more than 30%, it is judged that the engine water jacket is leaking; When the real-time measured water inlet pressure P 进水 The real-time measured water outlet pressure P is higher than the standard value of water inlet pressure P1 by more than 30%. 回水 If it is higher than the standard value of water outlet pressure P2 by more than 30%, and there is water spraying from the auxiliary water tank pressure cap of the whole vehicle, it is judged that the engine water jacket is leaking.

2. The method for detecting engine water jacket leakage according to claim 1, characterized in that: The engine water jacket serves as a coolant circulation channel for heat exchange between engine body components and the coolant.

3. The method for detecting engine water jacket leakage according to claim 1, characterized in that: The engine water pump provides driving force for the flow of coolant in the cooling system, and is used to drive the coolant to circulate in the engine cooling system.

4. The engine water jacket leakage detection method according to claim 1, characterized in that: The water flow meter is used to measure the coolant flow when the engine is running.

5. The engine water jacket leakage detection method according to claim 1, characterized in that: The vehicle auxiliary water tank is a main component of the engine cooling system, which is used for degassing the cooling system; and is used for the water storage tank to replenish coolant to the engine water inlet through the excitation pipe.

6. The engine water jacket leakage detection method according to claim 1, characterized in that: The water inlet pressure sensor is used to measure the water inlet pressure of the engine coolant system.

7. The method for detecting engine water jacket leakage according to claim 1, characterized in that: The cooling heat exchanger is a core component of the cooling system and is used for dissipating heat from the engine coolant.

8. The method for detecting engine water jacket leakage according to claim 1, characterized in that: The water outlet pressure sensor is used to measure the water outlet pressure of the engine coolant system.

9. The engine water jacket leakage detection method according to claim 1, characterized in that: The engine ECU is used as a control component to collect engine inlet and outlet water pressure and water flow signals, and transmit corresponding signals to the vehicle control panel after relevant processing.

10. The engine water jacket leakage detection method according to claim 9, characterized in that: The vehicle control panel safety alarm acts as an execution component and performs corresponding actions after receiving relevant execution signals.

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