Method applied to urban low-speed working condition noise control

Abstract

The invention relates to the technical field of vehicle noise control, and discloses a method applied to urban low-speed working condition noise control, which comprises the following steps: step 1, after a vehicle enters an urban low-speed working condition, detecting the torque and the vehicle speed in real time when the vehicle runs, the high torque ratio and the high rotating speed ratio of the vehicle within a period of time after the vehicle enters the urban low-speed working condition are judged; 2, if the high-torque ratio of the vehicle exceeds 50%, it is judged that the vehicle is an engineering vehicle, and the vehicle enters a torque mute mode; 3, if the high-rotating-speed ratio of the vehicle exceeds 50%, it is judged that the vehicle is a road vehicle, and the vehicle enters a vehicle speed silence mode; and 4, the vehicle exits from the mute mode and runs normally. Different types of vehicles are distinguished by detecting the torque and the vehicle speed, so that targeted noise judgment is performed on the different types of vehicles, the noise is effectively reduced, and the situation that the feeling and operation of a driver are affected due to the fact that the noise is too large is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle noise control, and in particular to a method for noise control in low-speed urban conditions. Background Art

[0002] The existing engine noise sources are mainly combustion noise and mechanical transmission. The noise of mechanical transmission can be optimized and improved through structures such as helical gears, while combustion noise is unavoidable during use, especially under long idle conditions, and the driver's evaluation of the noise will be very poor.

[0003] In urban conditions with frequent starts or in logistics sites with long-term low-speed conditions, vehicle types are divided into engineering vehicles and road vehicles. The main feature of road vehicles is high driving speed, while the main feature of engineering vehicles is low speed and high torque. The noise reduction methods of different vehicle types are also different.

[0004] Therefore, how to improve the driver's subjective experience based on the characteristics of different vehicles during user use, on the premise of meeting basic functional power requirements, engine original emissions not exceeding tolerances and meeting regulatory requirements, is a problem that needs to be solved. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the engine combustion noise is relatively large and the driver's subjective feeling is relatively poor.

[0006] In order to solve the above technical problems, the technical solution of the present invention is to provide a method for controlling noise in low-speed urban conditions, comprising the following steps:

[0007] Step 1: After the vehicle enters the urban low-speed operating condition, the torque and speed of the vehicle are detected in real time, and the proportion of high torque and high speed for a period of time after the vehicle enters the urban low-speed operating condition is determined;

[0008] Step 2: If the high torque ratio of the vehicle exceeds 50%, the vehicle type is determined to be an engineering vehicle and enters the torque silent mode;

[0009] Step 3: If the high speed ratio of the vehicle exceeds 50%, the vehicle type is determined to be a road vehicle and the vehicle enters the speed silent mode;

[0010] Step 4: The vehicle exits silent mode and drives normally.

[0011] Optionally, in step 1, it is determined that the time of high torque proportion and high speed proportion after the vehicle enters the urban low-speed operating mode is 5 to 10 minutes.

[0012] Optionally, in step 1, when the vehicle is running in a low-speed city condition, when the engine torque exceeds half of the rated torque, it is high torque, and when the engine speed exceeds half of the rated speed, it is high speed.

[0013] Optionally, in step 2, the torque silent mode includes:

[0014] Step 2.1: Detect the engine output torque, set a first torque threshold and a second torque threshold, and if the engine output torque is less than the first torque threshold, enter the silent mode, that is, reduce the fuel injection amount to only the fuel injection amount required to meet the basic power consumption requirement;

[0015] Step 2.2: After entering the silent mode, the timer performs a 1-minute cycle. If the engine output torque is less than the second torque threshold within 1 minute, the silent mode is maintained;

[0016] Step 2.3: If the engine output torque is greater than the second torque threshold within 1 minute, the silent mode is exited, the fuel injection amount is increased, and the vehicle operates normally;

[0017] Step 2.4: After the vehicle runs normally, the output torque is continuously detected for 1 minute. If the engine output torque is less than the first torque threshold within 1 minute, return to step 2.1.

[0018] Optionally, the first torque threshold of step 2.1 is 10% of the rated torque, and the second torque threshold is 30% of the rated torque.

[0019] Optionally, in step 3, the vehicle speed silent mode includes:

[0020] Step 3.1: Detecting a vehicle speed signal, setting a first vehicle speed threshold and a second vehicle speed threshold, if the vehicle speed is less than the first vehicle speed threshold, entering a silent mode, that is, reducing the fuel injection amount to only the amount required to meet basic power consumption requirements;

[0021] Step 3.2: After entering the silent mode, the timer performs a 1-minute cycle. If the engine speed is less than the second speed threshold within 1 minute, the silent mode is maintained;

[0022] Step 3.3: If the engine speed is greater than the second speed threshold within 1 minute, the silent mode is exited, the fuel injection amount is increased, and the vehicle runs normally;

[0023] Step 3.4: After the vehicle runs normally, the vehicle speed is continuously detected for 1 minute. If the vehicle speed is less than the first vehicle speed threshold within 1 minute, return to step 3.1.

[0024] Optionally, the method for noise control under urban low-speed conditions according to claim 1 is characterized in that the first vehicle speed threshold of step 3.1 is 5 km / h, and the second vehicle speed threshold is 50 km / h.

[0025] Optionally, in step 3, if the vehicle speed signal detection fails or is unreliable, the vehicle enters the torque silent mode.

[0026] In summary, the present invention distinguishes different types of vehicles by detecting torque and vehicle speed, and thus makes targeted noise judgments for different types of vehicles, thereby effectively reducing noise and preventing excessive noise from affecting the driver's experience and operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a flow chart of the torque silent mode of the present invention;

[0028] Figure 2 This is a flow chart of the vehicle speed silent mode of the present invention. DETAILED DESCRIPTION

[0029] The following combination Figure 1-2 The present invention is described in further detail.

[0030] The present invention discloses a method for controlling noise in low-speed urban conditions, which is applicable to engineering vehicles and urban road vehicles, and comprises the following steps:

[0031] Step 1: After the vehicle enters the urban low-speed condition, the torque and speed of the vehicle are detected in real time, and the high torque ratio and high speed ratio within 5 to 10 minutes after the vehicle enters the urban low-speed condition are determined, that is, the ratio of the engine torque exceeding the rated torque for half of the time and the ratio of the engine speed exceeding the rated speed for half of the time;

[0032] Step 2: If the high torque ratio of the vehicle exceeds 50%, the vehicle type is determined to be an engineering vehicle and enters the torque silent mode;

[0033] Step 3: If the high speed ratio of the vehicle exceeds 50%, the vehicle type is determined to be a road vehicle and the vehicle enters the speed silent mode;

[0034] Step 4: The vehicle exits silent mode and drives normally.

[0035] In a further embodiment, referring to Figure 1 , in step 2, the torque silent mode includes:

[0036] Step 2.1: Detect the engine output torque, set a first torque threshold and a second torque threshold, the first torque threshold is 10% of the rated torque, and the second torque threshold is 30% of the rated torque. If the engine output torque is less than the first torque threshold, enter the silent mode, that is, reduce the fuel injection amount to only the amount required to meet the basic power consumption requirements;

[0037] Step 2.2: After entering the silent mode, the timer performs a 1-minute cycle. If the engine output torque is less than the second torque threshold within 1 minute, the silent mode is maintained;

[0038] Step 2.3: If the engine output torque is greater than the second torque threshold within 1 minute, the silent mode is exited, the fuel injection amount is increased, and the vehicle runs normally. At this time, the engine is normally loaded, but the noise level is increased;

[0039] Step 2.4: After the vehicle runs normally, the output torque is continuously detected for 1 minute. If the engine output torque is less than the first torque threshold within 1 minute, return to step 2.1 and enter the silent mode again.

[0040] In a further embodiment, referring to Figure 2 In step 3, the vehicle speed silent mode includes:

[0041] Step 3.1: Detect the vehicle speed signal, set the first vehicle speed threshold and the second vehicle speed threshold, the first vehicle speed threshold is 5km / h, and the second vehicle speed threshold is 50km / h. If the vehicle speed is less than the first vehicle speed threshold, enter the silent mode, that is, reduce the injection amount to only meet the basic power consumption requirements, ensure the basic operating power of the engine, and give up the load-carrying capacity;

[0042] Step 3.2: After entering the silent mode, the timer performs a 1-minute cycle. If the engine speed is less than the second speed threshold within 1 minute, the silent mode is maintained;

[0043] Step 3.3: If the engine speed is greater than the second speed threshold within 1 minute, the silent mode is exited, the fuel injection amount is increased, and the vehicle runs normally;

[0044] Step 3.4: After the vehicle runs normally, the vehicle speed is continuously detected for 1 minute. If the vehicle speed is less than the first vehicle speed threshold within 1 minute, return to step 3.1.

[0045] In a further embodiment, if the vehicle speed signal detection fails or is unreliable or the speed sensor is damaged, the vehicle enters the torque silent mode. Because the speed signal detection is prone to failure, the vehicle enters the torque silent mode when the high torque proportion and the high speed proportion are both greater than or less than 50%.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for controlling noise in low-speed urban conditions, characterized in that: The following steps are involved: Step 1: After the vehicle enters the urban low-speed operating condition, the torque and speed of the vehicle are detected in real time, and the proportion of high torque and high speed for a period of time after the vehicle enters the urban low-speed operating condition is determined; Step 2: If the high torque ratio of the vehicle exceeds 50%, the vehicle type is determined to be an engineering vehicle and enters the torque silent mode; Step 3: If the high speed ratio of the vehicle exceeds 50%, the vehicle type is determined to be a road vehicle and the vehicle enters the speed silent mode; Step 4: The vehicle exits silent mode and drives normally.

2. The method for controlling noise in low-speed urban conditions according to claim 1, characterized in that: In step 1, it is determined that the time of high torque proportion and high speed proportion after the vehicle enters the urban low-speed operating mode is 5 to 10 minutes.

3. The method for noise control in low-speed urban conditions according to claim 1 is characterized in that: In step 1, when the vehicle is running in a low-speed urban condition, when the engine torque exceeds half of the rated torque, it is high torque, and when the engine speed exceeds half of the rated speed, it is high speed.

4. The method for noise control in urban low-speed conditions according to claim 1 is characterized in that: In step 2, the torque silent mode includes: Step 2.1: Detect the engine output torque, set a first torque threshold and a second torque threshold, and if the engine output torque is less than the first torque threshold, enter the silent mode, that is, reduce the fuel injection amount to only the fuel injection amount required to meet the basic power consumption requirement; Step 2.2: After entering the silent mode, the timer performs a 1-minute cycle. If the engine output torque is less than the second torque threshold within 1 minute, the silent mode is maintained; Step 2.3: If the engine output torque is greater than the second torque threshold within 1 minute, the silent mode is exited, the fuel injection amount is increased, and the vehicle operates normally; Step 2.4: After the vehicle runs normally, the output torque is continuously detected for 1 minute. If the engine output torque is less than the first torque threshold within 1 minute, return to step 2.

1.

5. The method for controlling noise in low-speed urban conditions according to claim 4 is characterized in that: The first torque threshold of step 2.1 is 10% of the rated torque, and the second torque threshold is 30% of the rated torque.

6. The method for noise control in urban low-speed conditions according to claim 1 is characterized in that: In step 3, the vehicle speed silent mode includes: Step 3.1: Detecting a vehicle speed signal, setting a first vehicle speed threshold and a second vehicle speed threshold, if the vehicle speed is less than the first vehicle speed threshold, entering a silent mode, that is, reducing the fuel injection amount to only the amount required to meet basic power consumption requirements; Step 3.2: After entering the silent mode, the timer performs a 1-minute cycle. If the engine speed is less than the second speed threshold within 1 minute, the silent mode is maintained; Step 3.3: If the engine speed is greater than the second speed threshold within 1 minute, the silent mode is exited, the fuel injection amount is increased, and the vehicle runs normally; Step 3.4: After the vehicle runs normally, the vehicle speed is continuously detected for 1 minute. If the vehicle speed is less than the first vehicle speed threshold within 1 minute, return to step 3.

1.

7. The method for controlling noise in low-speed urban conditions according to claim 6, characterized in that: The first vehicle speed threshold of step 3.1 is 5 km / h, and the second vehicle speed threshold is 50 km / h.

8. The method for noise control in urban low-speed conditions according to claim 1 is characterized in that: In step 3, if the vehicle speed signal detection fails or is unreliable, the vehicle enters the torque silent mode.

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