CN111783022B - Acceleration condition suspension vibration isolation calculation method for eliminating road surface excitation - Google Patents

Acceleration condition suspension vibration isolation calculation method for eliminating road surface excitation Download PDF

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CN111783022B
CN111783022B CN202010491828.7A CN202010491828A CN111783022B CN 111783022 B CN111783022 B CN 111783022B CN 202010491828 A CN202010491828 A CN 202010491828A CN 111783022 B CN111783022 B CN 111783022B
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suspension
vibration
excitation
road surface
acceleration
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CN111783022A (en
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薛顺达
王立星
沈平
木标
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Sinetac Automobile Technology Shanghai Co ltd
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Sinetac Automobile Technology Shanghai Co ltd
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    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/52—Determining velocity

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Abstract

The invention discloses a suspension vibration isolation calculation method for eliminating the acceleration condition excited by a road surface, which comprises the following steps of: 1) arranging acceleration vibration sensors at the active end and the passive end of the suspension, monitoring the vehicle speed by using a GPS (global positioning system), monitoring the rotating speed of an engine by using a CAN (controller area network) line, and setting a tracking mode to be Up/Down in LMS (least mean square) software to track the vehicle speed; 2) continuously testing the working conditions of acceleration and neutral gear flameout and sliding, and collecting the vibration of the main end and the passive end of the suspension; 3) and the vibration signals of the main and passive ends of the suspension obtained by the test are mixed signals of engine excitation and road surface excitation. The invention suspends the calculation of the vibration signals of the main end and the passive end through the acceleration working condition and the neutral gear flameout sliding working condition: vWOT_ES‑VFD_ES、VWOT_BS‑VFD_BSAnd obtaining suspension driving end vibration signals and suspension driven end vibration signals for eliminating the road surface excitation, separating road surface excitation components in the suspension driving end vibration and the suspension driven end vibration obtained through testing to obtain pure engine excitation, and calculating to obtain suspension vibration isolation quantity for eliminating the influence of the road surface excitation.

Description

Acceleration condition suspension vibration isolation calculation method for eliminating road surface excitation
Technical Field
The invention relates to the field of automobile driving, in particular to a suspension vibration isolation calculation method for eliminating road excitation under an acceleration condition.
Background
The existing calculation formula of the vibration isolation amount of the suspension under the acceleration working condition is 20log (VES/VBS), wherein VES is vibration of a suspension driving end, VBS is vibration of a suspension driven end, and the existing calculation method has the following problems: the influence of road surface excitation on vibration isolation calculation cannot be avoided, the calculated vibration isolation amount is not accurate enough, and the suspension vibration isolation amount under the acceleration working condition is the attenuation capacity of the suspension on the engine excitation when the suspension is pressed under the condition of large torque output of the engine. In the tested vibration of the active end and the passive end of the suspension, in addition to the engine excitation, the road excitation exists, as shown in figure 2.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a suspension vibration isolation calculation method for eliminating the road excitation under the acceleration condition.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention provides a suspension vibration isolation calculation method for eliminating the acceleration working condition of road excitation, which comprises the following steps:
1) arranging acceleration vibration sensors at the active end and the passive end of the suspension, monitoring the vehicle speed by using a GPS (global positioning system), monitoring the rotating speed of an engine by using a CAN (controller area network) line, and setting a tracking mode to be Up/Down in LMS (least mean square) software to track the vehicle speed;
2) the continuous test is accelerated, neutral gear flame-out slides the operating mode, gathers suspension owner, passive end vibration: the vibration of the active end of the suspension under the acceleration condition is recorded as VWOT_ESAnd the vibration of the suspension passive end is recorded as V under the acceleration conditionWOT_BSSuspension driving end vibration in neutral sliding condition is marked as VFD_ESAnd the vibration of the suspended passive end under the neutral gear sliding working condition is recorded as VFD_BS；
3) The vibration signals of the main and passive ends of the suspension obtained by testing are mixed signals of engine excitation and road excitation, the road excitation part is removed, and the rest is engine excitation; for the same road surface, for the same vehicle, the road surface excitation is only related to the vehicle speed, so the road surface excitation under the same vehicle speed should be the same; when the engine does not work under the working condition of neutral flameout and sliding, the vibration signals of the suspension main end and the suspension passive end only comprise a road surface excitation part; the vibration signal of the accelerating working condition under the same vehicle speed subtracts the vibration signal of the sliding working condition under the same vehicle speed, so that the excitation of the engine can be separated;
4) v at a certain speed under an acceleration conditionWOT_ESSignal minus V at the same speedFD_ESThe signal can be obtained to eliminate the vibration signal V of the suspension active end excited by the road surfaceES(ii) a Similarly, V at a certain speed under an acceleration conditionWOT_BSSignal minus V at the same speedFD_BSThe signal can be obtained to eliminate the vibration signal V of the suspension passive end excited by the road surfaceBS ；
5) The suspension vibration isolation amount for eliminating the influence of road surface excitation is as follows:
20log(VES/VBS)= 20log((VWOT_ES-VFD_ES)/( VWOT_BS-VFD_BS))。
compared with the prior art, the invention has the following beneficial effects:
the invention suspends the calculation of the vibration signals of the main end and the passive end through the acceleration working condition and the neutral gear flameout sliding working condition: vWOT_ES-VFD_ES、VWOT_BS-VFD_BSAnd obtaining suspension driving end vibration signals and suspension driven end vibration signals for eliminating the road surface excitation, separating road surface excitation components in the suspension driving end vibration and the suspension driven end vibration obtained through testing to obtain pure engine excitation, and calculating to obtain suspension vibration isolation quantity for eliminating the influence of the road surface excitation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a method for calculating the suspension vibration isolation amount under the acceleration condition of the present invention;
fig. 2 is a schematic view of the vibration transmission path and sensor arrangement of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
As shown in fig. 1-2, the invention provides a suspension vibration isolation calculation method for eliminating the acceleration condition of road excitation, which comprises the following steps:
1) arranging acceleration vibration sensors at the active end and the passive end of the suspension, monitoring the vehicle speed by using a GPS (global positioning system), monitoring the rotating speed of an engine by using a CAN (controller area network) line, and setting a tracking mode to be Up/Down in LMS (least mean square) software to track the vehicle speed;
2) the continuous test is accelerated, neutral gear flame-out slides the operating mode, gathers suspension owner, passive end vibration: the vibration of the active end of the suspension under the acceleration condition is recorded as VWOT_ESAnd the vibration of the suspension passive end is recorded as V under the acceleration conditionWOT_BSSuspension driving end vibration in neutral sliding condition is marked as VFD_ESAnd the vibration of the suspension passive end under the neutral gear sliding working condition is recorded as VFD_BS；
3) The vibration signals of the main and passive ends of the suspension obtained by testing are mixed signals of engine excitation and road excitation, the road excitation part is removed, and the rest is engine excitation; for the same road surface, for the same vehicle, the road surface excitation is only related to the vehicle speed, so the road surface excitation under the same vehicle speed should be the same; when the engine does not work under the working condition of neutral flameout and sliding, the vibration signals of the suspension main end and the suspension passive end only comprise a road surface excitation part; the engine excitation can be separated by subtracting the vibration signal of the sliding condition at the same vehicle speed from the vibration signal of the acceleration condition at the same vehicle speed, as shown in fig. 1;
4) v at a certain speed under an acceleration conditionWOT_ESSignal minus V at the same speedFD_ESThe signal can be obtained to eliminate the vibration signal V of the suspension active end excited by the road surfaceES(ii) a Similarly, V at a certain speed under an acceleration conditionWOT_BSSignal minus V at the same speedFD_BSThe signal can be obtained to eliminate the vibration signal V of the suspension passive end excited by the road surfaceBS As shown in fig. 1;
5) as shown in fig. 1, the amount of suspension vibration isolation excluding the influence of road surface excitation is:
20log(VES/VBS)= 20log((VWOT_ES-VFD_ES)/( VWOT_BS-VFD_BS))。
specifically, the method for removing the road surface excitation comprises the following steps: the method comprises the steps of measuring engine excitation and road surface excitation under an acceleration working condition, measuring road surface excitation under a neutral flameout sliding working condition, and measuring vibration under the acceleration working condition-neutral flameout sliding working condition = pure engine excitation.
The suspension is arranged between the engine and the vehicle body to play a role in isolating the vibration of the engine, when the vehicle runs, the vibration of the whole vehicle can be caused by the excitation of the road surface, the suspension can naturally shake along with the vibration, and the vibration measured on the suspension has a road surface excitation component; when a vehicle runs, an engine works, vibration measured on a suspension also has engine excitation components, so that signals measured at the active end and the passive end of the suspension are mixed signals of two signals, the signals can affect each other, the engine excitation is required for suspension vibration isolation, and the road excitation is external interference and can affect the calculation of the suspension vibration isolation.
Road excitation is caused by vehicle travel and road surface unevenness, stationary vehicles do not have road excitation, rough, pothole roads are excited more than smooth roads, and for a given vehicle, the magnitude of road excitation is only related to vehicle speed on a given road, e.g., driving through a speed bump, why the speed is reduced, is to reduce (bump on the speed bump) road excitation.
The patent proposes that the neutral gear flameout sliding working condition is tested, the flameout is carried out, the engine does not work, no engine excitation exists, the vehicle continues to run by means of inertia, and only the road surface excitation exists at the moment; the neutral gear enables the transmission system not to work, avoids the situation that the running of wheels drives the power system to rotate in a reverse dragging mode, and ensures that the vibration measured on the suspension only comes from the excitation of the road surface;
this patent mentions that to track the vehicle speed using GPS, the road excitation at each speed is the same for the same speed as the acceleration, e.g. from 30km/h to 80km/h, from 80km/h to 30km/h with neutral idle, 45km/h for acceleration is the same as 45km/h for coasting, 50km/h for acceleration is the same as 50km/h for coasting, for a certain vehicle the magnitude of the road excitation is only related to the vehicle speed on the determined road, so that the road excitation is the same for both acceleration and coasting conditions, the acceleration condition measures a mixed signal of engine excitation and road excitation, the neutral stall condition measures a road excitation signal, the engine excitation signal can be obtained by using the vibration under the acceleration working condition and the vibration under the flameout sliding working condition.
Compared with the prior art, the invention has the following beneficial effects:
the invention passes through the acceleration working condition and the neutral gearCalculating vibration signals of the main and passive suspension ends under flameout sliding conditions: vWOT_ES-VFD_ES、VWOT_BS-VFD_BSAnd obtaining suspension driving end vibration signals and suspension driven end vibration signals for eliminating the road surface excitation, separating road surface excitation components in the suspension driving end vibration and the suspension driven end vibration obtained through testing to obtain pure engine excitation, and calculating to obtain suspension vibration isolation quantity for eliminating the influence of the road surface excitation.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (1)

1. A suspension vibration isolation calculation method for eliminating the acceleration working condition of road excitation is characterized by comprising the following steps:
1) arranging acceleration vibration sensors at the active end and the passive end of the suspension, monitoring the vehicle speed by using a GPS (global positioning system), monitoring the rotating speed of an engine by using a CAN (controller area network) line, and setting a tracking mode to be Up/Down in LMS (least mean square) software to track the vehicle speed;
2) the continuous test is accelerated, neutral gear flame-out slides the operating mode, gathers suspension owner, passive end vibration: the vibration of the active end of the suspension under the acceleration condition is recorded as VWOT_ESAnd the vibration of the suspension passive end is recorded as V under the acceleration conditionWOT_BSSuspension driving end vibration in neutral sliding condition is marked as VFD_ESAnd the vibration of the suspension passive end under the neutral gear sliding working condition is recorded as VFD_BS；
3) The vibration signals of the main and passive ends of the suspension obtained by testing are mixed signals of engine excitation and road excitation, the road excitation part is removed, and the rest is engine excitation; for the same road surface, for the same vehicle, the road surface excitation is only related to the vehicle speed, so the road surface excitation under the same vehicle speed should be the same; when the engine does not work under the working condition of neutral flameout and sliding, the vibration signals of the suspension main end and the suspension passive end only comprise a road surface excitation part; the vibration signal of the accelerating working condition under the same vehicle speed subtracts the vibration signal of the sliding working condition under the same vehicle speed, so that the excitation of the engine can be separated;
4) v at a certain speed under an acceleration conditionWOT_ESSignal minus V at the same speedFD_ESThe signal can be obtained to eliminate the vibration signal V of the suspension active end excited by the road surfaceES(ii) a Similarly, V at a certain speed under an acceleration conditionWOT_BSSignal minus V at the same speedFD_BSThe signal can be obtained to eliminate the vibration signal V of the suspension passive end excited by the road surfaceBS ；
5) The suspension vibration isolation amount for eliminating the influence of road excitation is as follows:
20log(VES/VBS)= 20log((VWOT_ES-VFD_ES)/( VWOT_BS-VFD_BS))。
CN202010491828.7A 2020-06-03 2020-06-03 Acceleration condition suspension vibration isolation calculation method for eliminating road surface excitation Active CN111783022B (en)

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CN113418723A (en) * 2021-06-21 2021-09-21 哈尔滨东安汽车动力股份有限公司 Method for measuring vibration isolation rate of finished automobile suspension

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CN104515661A (en) * 2014-12-29 2015-04-15 安徽江淮汽车股份有限公司 Method for measuring vibration contribution of suspension point
CN106568604A (en) * 2016-11-09 2017-04-19 华南理工大学 Calculation method for vibration isolation rate of automotive power assembly suspension system

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DE102008047217A1 (en) * 2008-09-15 2010-03-25 Siemens Aktiengesellschaft System and method for transmitting signals

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Publication number Priority date Publication date Assignee Title
CN101936360A (en) * 2010-09-07 2011-01-05 吉林大学 Semi-active control magnetorheological hydraulic mount for automotive powertrain
CN104515661A (en) * 2014-12-29 2015-04-15 安徽江淮汽车股份有限公司 Method for measuring vibration contribution of suspension point
CN106568604A (en) * 2016-11-09 2017-04-19 华南理工大学 Calculation method for vibration isolation rate of automotive power assembly suspension system

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Denomination of invention: A Calculation Method for Mounting Vibration Isolation under Accelerated Conditions Excluding Road Excitation

Effective date of registration: 20230313

Granted publication date: 20220503

Pledgee: Shanghai Rural Commercial Bank Co.,Ltd. Jiading sub branch

Pledgor: SINETAC AUTOMOBILE TECHNOLOGY (SHANGHAI) Co.,Ltd.

Registration number: Y2023310000061