Diesel engine double-sensor signal processing control strategy

Abstract

The invention discloses a control strategy for dual-sensor signal processing of a diesel engine, relates to the field of engine faults, and solves the technical problem that the existing dual sensors are easy to report mistakenly and cause excessive protection of the engine. The strategy comprises the following steps: acquiring output signals of two paths of sensors, and judging whether a hardware fault exists or not according to the output signals; if the output signal of the first-path sensor is normal and the output signal of the second-path sensor shows that a hardware fault exists, taking the output signal of the first-path sensor as a target signal; and if the output signal of the second-path sensor is normal and the output signal of the first-path sensor displays that a hardware fault exists, taking the output signal of the second-path sensor as a target signal. The engine can still operate normally under the condition that faults are reported, safe operation of the engine is guaranteed, and the using comfort level of customers is improved.

Description

Technical Field

[0001] The invention relates to the field of engine failure, and more specifically, to a control strategy for dual-sensor signal processing of a diesel engine. Background Art

[0002] For V-type diesel engines, in order to allow the electronic control unit (ECU) to monitor the engine operating status, the engine will be equipped with an intake pressure temperature sensor to monitor the engine operating conditions. At the same time, some of the ECU's controls will be corrected based on the engine's working environment. Therefore, the intake pressure temperature sensor signal is crucial to the operation of the engine. For V-type diesel engines, the engine generally has two sensor signals to monitor the intake pipes on both sides. At present, for V-type diesel engines, under normal circumstances, the two signals are close, and the ECU takes the value of 1 signal and uses the 2 signals as verification. When 1 signal fails, it reports 1 signal abnormality, the ECU reports the fault and performs alarm protection measures on the engine, which can fully ensure the safety of the engine.

[0003] However, regardless of whether it is a data center, emergency backup power supply or a V-type diesel engine for ship use, the value is taken as 1-way signal, and 2-way signal is used as verification. When 1-way signal is abnormal, 1-way signal fault alarm is reported. Although this can fully ensure the safety of the engine, there are problems such as false alarm of engine 1-way signal sensor affecting fault triggering and the normal 2-way sensor not really playing the role of sensor after 1-way sensor failure, resulting in engine over-protection, etc. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a control strategy for dual-sensor signal processing of a diesel engine in view of the deficiencies in the prior art, so as to solve the technical problem that the existing dual-sensor is prone to false alarms and causes excessive protection of the engine.

[0005] A control strategy for dual-sensor signal processing of a diesel engine according to the present invention includes obtaining output signals of two sensors and determining whether there is a hardware fault according to the output signals;

[0006] If the output signal of the first sensor is normal and the output signal of the second sensor shows that there is a hardware failure, the output signal of the first sensor is used as the target signal;

[0007] If the output signal of the second sensor is normal and the output signal of the first sensor shows that there is a hardware failure, the output signal of the second sensor is used as the target signal;

[0008] If the output signal of the first sensor and the output signal of the second sensor are both normal, triggering a signal verification mechanism;

[0009] If the output signal of the first sensor and the output signal of the second sensor both indicate a hardware fault, a serious fault alarm is triggered.

[0010] As a further improvement, when the output signal of the second sensor indicates that there is a hardware fault, a second output signal fault alarm is performed;

[0011] When the output signal of the first sensor is obtained to indicate a hardware failure, a first output signal failure alarm is issued.

[0012] Further, determining whether the hardware failure exists is specifically, taking the output signal of the first sensor as the first output signal, and taking the output signal of the second sensor as the second output signal;

[0013] When the first output signal and the second output signal are obtained, the real-time voltage amplitude of the first output signal is used as the first voltage amplitude, the real-time voltage amplitude of the second output signal is used as the second voltage amplitude, and the first voltage amplitude and the second voltage amplitude are compared with a preset standard voltage amplitude range;

[0014] When the first voltage amplitude is within the standard voltage amplitude interval and the second voltage amplitude is not within the standard voltage amplitude interval, taking the first output signal as a sensor target signal, and determining that a hardware fault exists in the second output signal;

[0015] When the second voltage amplitude is within the standard voltage amplitude interval and the first voltage amplitude is not within the standard voltage amplitude interval, taking the second output signal as a sensor target signal, and determining that a hardware fault exists in the first output signal;

[0016] When the second voltage amplitude and the first voltage amplitude are both within the standard voltage amplitude range, a signal verification mechanism is triggered;

[0017] When both the second voltage amplitude and the first voltage amplitude are not within the standard voltage amplitude range, it is determined that both the first output signal and the second output signal have hardware faults.

[0018] Furthermore, the signal verification mechanism is to set a first verification time and a second verification time, and when the first voltage amplitude is obtained, the first verification time starts to count, and when the first verification time ends, the real-time voltage amplitude of the first output signal after the first verification time ends is used as the third voltage amplitude;

[0019] When the second voltage amplitude is obtained, the second verification time starts to be counted, and when the second verification time is finished, the real-time voltage amplitude of the second output signal after the second verification time is finished is used as the fourth voltage amplitude;

[0020] A first voltage offset is calculated by using the first voltage amplitude and the third voltage amplitude, and a second voltage offset is calculated by using the second voltage amplitude and the fourth voltage amplitude;

[0021] The first voltage offset is compared with a preset voltage offset standard value, and the second voltage offset is compared with the voltage offset standard value. When the first voltage offset is equal to the voltage offset standard value and the second voltage offset is equal to the voltage offset standard value, the sensor target signal is determined according to the set signal priority; otherwise, it is determined that both the first output signal and the second output signal have hardware faults.

[0022] Furthermore, the first output signal is set to a first signal priority, and the second output signal is set to a second signal priority.

[0023] Furthermore, the expression for calculating the first voltage offset is:

[0024]

[0025] Among them, U5 is the first voltage offset, U1 is the first voltage amplitude, U3 is the third voltage amplitude, and p is the first voltage offset coefficient.

[0026] Furthermore, the expression for calculating the second voltage offset is:

[0027]

[0028] Among them, U6 is the second voltage offset, U2 is the second voltage amplitude, U4 is the fourth voltage amplitude, and k is the second voltage offset coefficient.

[0029] Beneficial Effects

[0030] The advantages of the present invention are:

[0031] The present invention determines the sensor target signal and judges whether there is a hardware fault by obtaining the output signal of the first sensor and the output signal of the second sensor, so that the engine can still operate normally when a fault is reported, ensuring the safe operation of the engine and improving the comfort of customer use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a flow chart of the dual sensor signal processing control strategy of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the embodiments, but it does not constitute any limitation to the present invention. Any limited number of modifications made by anyone within the scope of the claims of the present invention are still within the scope of the claims of the present invention.

[0034] See also Figure 1 The present invention provides a control strategy for dual-sensor signal processing of a diesel engine. The strategy includes obtaining output signals of two sensors and determining whether there is a hardware fault based on the output signals.

[0035] If the output signal of the first sensor is normal and the output signal of the second sensor shows that there is a hardware failure, the output signal of the first sensor is used as the target signal.

[0036] If the output signal of the second sensor is normal and the output signal of the first sensor shows that there is a hardware failure, the output signal of the second sensor is used as the target signal.

[0037] If the output signal of the first sensor and the output signal of the second sensor are both normal, the signal verification mechanism is triggered.

[0038] If the output signal of the first sensor and the output signal of the second sensor both indicate a hardware fault, a serious fault alarm is triggered.

[0039] When the output signal of the second sensor is obtained and shows that there is a hardware fault, a second output signal fault alarm is issued;

[0040] When the output signal of the first sensor is obtained and shows that a hardware fault exists, a first output signal fault alarm is issued.

[0041] Determining whether a hardware fault is displayed includes, specifically, taking the output signal of the first sensor as the first output signal and taking the output signal of the second sensor as the second output signal.

[0042] When the first output signal and the second output signal are obtained, the real-time voltage amplitude of the first output signal is used as the first voltage amplitude, the real-time voltage amplitude of the second output signal is used as the second voltage amplitude, and the first voltage amplitude and the second voltage amplitude are compared with the standard voltage amplitude range.

[0043] When the first voltage amplitude is within the standard voltage amplitude range and the second voltage amplitude is not within the standard voltage amplitude range, the first output signal is used as the sensor target signal, and it is determined that the second output signal shows a hardware fault, indicating that the second output signal is faulty and it is necessary to troubleshoot the line on the second output signal or the sensor that outputs the second output signal.

[0044] When the second voltage amplitude is within the standard voltage amplitude range and the first voltage amplitude is not within the standard voltage amplitude range, the second output signal is used as the sensor target signal, and it is determined that the first output signal shows a hardware fault, indicating that there is a fault in the first output signal, and it is necessary to troubleshoot the line on the first output signal or the sensor that outputs the first output signal.

[0045] When the second voltage amplitude and the first voltage amplitude are both within the standard voltage amplitude range, the signal verification mechanism is triggered, and the signal verification mechanism can further verify the first output signal and the second output signal to ensure the accuracy of the signal and reduce the failure rate.

[0046] When both the second voltage amplitude and the first voltage amplitude are not within the standard voltage amplitude interval, a serious fault signal is output, indicating that hardware faults exist in both output signals.

[0047] The signal verification mechanism is to set a first verification time and a second verification time. When the first voltage amplitude is obtained, the first verification time starts to count. When the first verification time ends, the real-time voltage amplitude of the first output signal after the first verification time ends is used as the third voltage amplitude.

[0048] When the second voltage amplitude is obtained, the second verification time starts to be counted, and when the second verification time is finished, the real-time voltage amplitude of the second output signal after the second verification time is finished is used as the fourth voltage amplitude.

[0049] The first voltage offset is calculated by the first voltage amplitude and the third voltage amplitude, and the second voltage offset is calculated by the second voltage amplitude and the fourth voltage amplitude. The stability of the first output signal and the second output signal is observed by the first voltage offset and the second voltage offset.

[0050] The expression for calculating the first voltage offset is:

[0051]

[0052] Among them, U5 is the first voltage offset, U1 is the first voltage amplitude, U3 is the third voltage amplitude, p is the first voltage offset coefficient, and the first voltage offset coefficient p is 0.56.

[0053] The expression for calculating the second voltage offset is:

[0054]

[0055] Among them, U6 is the second voltage offset, U2 is the second voltage amplitude, U4 is the fourth voltage amplitude, k is the second voltage offset coefficient, and the second voltage offset coefficient k is 0.45.

[0056] The first voltage offset is compared with a preset voltage offset standard value, and the second voltage offset is compared with the voltage offset standard value. When the first voltage offset is equal to the voltage offset standard value and the second voltage offset is equal to the voltage offset standard value, the sensor target signal is determined according to the set signal priority. The signal priority is set specifically as follows: the first output signal is set to the first signal priority, and the second output signal is set to the second signal priority; otherwise, the output determines that both the first output signal and the second output signal show that there is a hardware fault, so that the engine can still operate normally when a fault is reported, thereby ensuring the safe operation of the engine and improving the comfort of customer use.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A control strategy for dual-sensor signal processing of a diesel engine, characterized in that: The strategy includes obtaining output signals of two sensors and determining whether there is a hardware fault according to the output signals; If the output signal of the first sensor is normal and the output signal of the second sensor shows that there is a hardware failure, the output signal of the first sensor is used as the target signal; If the output signal of the second sensor is normal and the output signal of the first sensor shows that there is a hardware failure, the output signal of the second sensor is used as the target signal; If the output signal of the first sensor and the output signal of the second sensor are both normal, triggering a signal verification mechanism; If the output signal of the first sensor and the output signal of the second sensor both indicate a hardware fault, a serious fault alarm is triggered.

2. A control strategy for dual-sensor signal processing of a diesel engine according to claim 1, characterized in that: When the output signal of the second sensor indicates a hardware failure, a second output signal failure alarm is issued; When the output signal to the first sensor shows that there is a hardware fault, a first output signal fault alarm is issued.

3. A control strategy for dual-sensor signal processing of a diesel engine according to claim 1, characterized in that: Determining whether the hardware fault exists, specifically, using the output signal of the first sensor as the first output signal, and using the output signal of the second sensor as the second output signal; When the first output signal and the second output signal are obtained, the real-time voltage amplitude of the first output signal is used as the first voltage amplitude, the real-time voltage amplitude of the second output signal is used as the second voltage amplitude, and the first voltage amplitude and the second voltage amplitude are compared with a preset standard voltage amplitude range; When the first voltage amplitude is within the standard voltage amplitude interval and the second voltage amplitude is not within the standard voltage amplitude interval, taking the first output signal as a sensor target signal, and determining that a hardware fault exists in the second output signal; When the second voltage amplitude is within the standard voltage amplitude interval and the first voltage amplitude is not within the standard voltage amplitude interval, taking the second output signal as a sensor target signal, and determining that a hardware fault exists in the first output signal; When the second voltage amplitude and the first voltage amplitude are both within the standard voltage amplitude range, a signal verification mechanism is triggered; When both the second voltage amplitude and the first voltage amplitude are not within the standard voltage amplitude range, it is determined that both the first output signal and the second output signal have hardware faults.

4. A control strategy for dual-sensor signal processing of a diesel engine according to claim 3, characterized in that: The signal verification mechanism is to set a first verification time and a second verification time. When the first voltage amplitude is obtained, the first verification time starts to count. When the first verification time ends, the real-time voltage amplitude of the first output signal after the first verification time ends is used as the third voltage amplitude. When the second voltage amplitude is obtained, the second verification time starts to be counted, and when the second verification time is finished, the real-time voltage amplitude of the second output signal after the second verification time is finished is used as the fourth voltage amplitude; A first voltage offset is calculated by using the first voltage amplitude and the third voltage amplitude, and a second voltage offset is calculated by using the second voltage amplitude and the fourth voltage amplitude; The first voltage offset is compared with a preset voltage offset standard value, and the second voltage offset is compared with the voltage offset standard value. When the first voltage offset is equal to the voltage offset standard value and the second voltage offset is equal to the voltage offset standard value, the sensor target signal is determined according to the set signal priority; otherwise, it is determined that both the first output signal and the second output signal have hardware faults.

5. A control strategy for dual-sensor signal processing of a diesel engine according to claim 4, characterized in that: The first output signal is set to a first signal priority, and the second output signal is set to a second signal priority.

6. A control strategy for dual-sensor signal processing of a diesel engine according to claim 4, characterized in that: The expression for calculating the first voltage offset is: Among them, U5 is the first voltage offset, U1 is the first voltage amplitude, U3 is the third voltage amplitude, and p is the first voltage offset coefficient.

7. A control strategy for dual-sensor signal processing of a diesel engine according to claim 4, characterized in that: The expression for calculating the second voltage offset is: Among them, U6 is the second voltage offset, U2 is the second voltage amplitude, U4 is the fourth voltage amplitude, and k is the second voltage offset coefficient.

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