• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for testing the behavior of an internal combustion engine (2) with a start-stop system during a starting process of the internal combustion engine (2), with a test bench (1) having an electric dynamometer (4) and with the dynamometer (4 ) via a shaft (5) connected to the coupling unit (6) with at least one switchable coupling (7), wherein the coupling unit (6) with a crankshaft (3) of the internal combustion engine (2) is connected. In order to detect the behavior of an internal combustion engine (2) in a simple and accurate manner, it is provided that the internal combustion engine (2) is started when the clutch (7) is open, bringing the dynamometer (4) to synchronous speed with the internal combustion engine (2) in that the clutch (7) is closed when the synchronous rotational speed is reached, and that a closing vehicle clutch is simulated after closing the clutch (7) by the dynamometer (4), whereby a load torque is applied to the shaft by the dynamometer (4). 5) is applied, which corresponds to the clutch characteristic of a closing vehicle clutch.
    公开号:AT516025A4
    申请号:T50622/2014
    申请日:2014-09-10
    公开日:2016-02-15
    发明作者:
    申请人:Tectos Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a method for testing the behavior of an internal combustion engine with start-stop system during a startup or stopping operation of the internal combustion engine, with a test stand having an electric dynamometer and connected to the dynamometer via a shaft coupling unit with at least one switchable coupling, wherein the coupling unit with a Crankshaft of the internal combustion engine is connected.
    Internal combustion engines of motor vehicles are increasingly equipped with start-stop functions due to the ever stricter exhaust gas legislation. The internal combustion engine is switched off when the vehicle is stationary and restarted as needed. This happens when you press the accelerator pedal by its own starter.
    This process must be taken into account in the development of internal combustion engines and therefore can be realistically modeled on the engine test bench.
    It is known to perform a start-stop simulation on the test bench either via a simulation of the start by the dynamometer of the test bench or by a vehicle coupling which is actuated via actuators.
    JP 2003-057152 A discloses an apparatus for testing the starting performance of an internal combustion engine using a starter model part simulating a starter characteristic. However, the mere simulation of the starting process has the disadvantage that the additional masses and inertias as well as the dead times of the controller cause a falsification of the process.
    While the use of a vehicle clutch does not provide the influence of the test bench, there is a deviation in reproducibility due to the wear of the clutch. In addition, it is not possible to simulate different clutch characteristics.
    The object of the invention is to avoid the disadvantages mentioned and to detect in a simple and accurate manner the behavior of an internal combustion engine during a start or stop process.
    According to the invention, the behavior of the internal combustion engine during a starting operation of the internal combustion engine can be tested by starting the engine with the clutch disengaged, bringing the dynamometer to synchronous speed with the internal combustion engine, closing the clutch when the synchronous speed is reached, and after the clutch has been closed by the dynamometer a closing vehicle clutch is simulated, wherein a load torque is applied to the shaft by the dynamometer, which corresponds to the clutch characteristic of a closing vehicle clutch.
    The behavior of the internal combustion engine during a stopping operation of the internal combustion engine can be tested by simulating an opening vehicle clutch while operating the internal combustion engine with the clutch engaged, applying a torque characteristic to the shaft by the dynamometer corresponding to the clutch characteristic of an opening vehicle clutch, that the speed of the engine is synchronized with the speed of the dynamometer, and that after the synchronization, the clutch is opened and after the opening of the clutch, the internal combustion engine is stopped. During the start or stop process, the clutch state is detected by at least one measured value, preferably the rotational speed of the input and / or output side of the clutch, the bearing temperature, the torque and / or shaft vibrations and / or accelerations, being measured in the clutch unit.
    The measured values are transmitted to an actuating unit or an automation unit. The coupling of the coupling unit is actuated electrically or hydraulically by the actuating unit. The control of the dynamometer and / or the actuator is performed by an automation unit based on a start / stop simulation program.
    The coupling unit preferably has at least one shaft bearing which is preferably arranged on the dynamometer side. The clutch unit is arranged as close as possible to the internal combustion engine and is preferably connected directly to the internal combustion engine - without a gearbox arranged therebetween.
    This arrangement allows a responsive and rigid connection of the engine with the dynamometer of the test bench.
    The invention will be explained in more detail below with reference to FIGS.
    Fig. 1 shows a test stand for testing the start-stop behavior of an internal combustion engine, Fig. 2 shows the curves of the rotational speeds and the torque during a starting process of the internal combustion engine, and Fig. 3 shows the characteristics of the rotational speeds and the torques during a stopping process of the internal combustion engine.
    1 shows a test bench 1 for testing the start-stop behavior of an internal combustion engine 2. The test bench 1 has an electric dynamometer 4 connectable to a crankshaft 3 of the internal combustion engine 2 and a clutch unit 6 connected to the dynamometer 4 via a shaft 5 with at least one shiftable clutch 7 for connecting and disconnecting the dynamometer 4 from the engine 2. In the coupling unit 6, a shaft bearing 8 is integrated on the side of the dynamometer 4.
    Furthermore, the coupling unit 6 sensors 9, 10 for measuring the Drehzahlenni, n2 on both sides - ie on the input side - the clutch 7, sensors 11, 12 for measuring the bearing temperatures Ti, T2, and possibly at least one sensor 13 for measuring the torque Mi on. The sensors 9, 10, 11, 12, 13 are connected to an actuator unit 14 via sensor lines 9a, 10a, 11a, 12a, 13a. In the coupling unit 6, thus, measured data of the coupling state, the rotational speeds nlf n2 of the input and output side, and the temperatures Ti, T2 of the bearings are measured and reported to the actuator unit 14. If necessary, this can be extended by a torque measurement Mi and measurements occurring accelerations. The coupling 7 of the coupling unit is actuated by the actuating unit 14 via an actuating line 15, for example electrically or hydraulically. Of course, a line-less remote transmission of the measured data and actuating commands is also possible instead of the electrical lines. The operation unit 14 makes the connection between a
    Automation system 16 of the test bed 1 and the coupling unit 6 ago. The automation system 16 is controlled by a start / stop simulation program 17.
    The clutch unit 6 allows a responsive and rigid connection of the engine 2 to the test bench 1. The clutch 7 may be designed, for example, as a multi-disc dry clutch or as a dog clutch. The entire clutch unit 6 is preferably connected directly to the engine 2 -without intervening transmission.
    2, the rotational speeds nlr n2 for the internal combustion engine 2 and the dynamometer 4, as well as a torque characteristic M applied by the dynamometer 4 for a simulated starting operation of the internal combustion engine 2 over the time t are plotted. With the line K, the state of the clutch 7 (clutch open: K0; clutch closed Ks) is indicated. To simulate the starting operation of the engine 2 in the start-stop simulation, the clutch 7 is opened at engine start and the engine 2 starts without connection to the test stand 1. At the same time, the dynamometer 4 formed by an electric machine is brought to synchronous speed ns with the engine 2. This phase is designated by reference symbol S. At the desired rotational speed ns of the internal combustion engine 2, the clutch 7 is closed at time ts, whereby the internal combustion engine 2 is connected to the test bench 1. The reference B denotes the start of the V-combustion. At this time ts, the engine 2 is not loaded. The simulation program 17 controlling the automation system 16 now applies a torque characteristic M simulating a clutch characteristic as load to the engine 2 at the moment tM via the dynamometer 4 and thus simulates the behavior of the rest of the vehicle.
    In FIG. 3, the rotational speeds nif n2 for the internal combustion engine 2 and the dynamometer 4 and a torque characteristic M applied by the dynamometer 4 for a simulated stop operation of the internal combustion engine 2 over time t are plotted. With the line K, the state of the clutch 7 (clutch open: K0; clutch closed Ks) is indicated. For simulating the engine stop, with the clutch 7 and the internal combustion engine 2 fired, first, by the simulation program 17, a characteristic of an opening-type clutch Momenetencharakteristik M is introduced via the dynamometer 4 and the engine speed ni of the internal combustion engine 2 synchronized. At the end of the process, the torque M at the clutch 7 is equal to zero, the rotational speeds nl of the internal combustion engine 2 and the dynamometer 4 are equal. Only then does the opening of the clutch 7 take place at the time t0, and the engine 2 is stopped without connection to the test bench 1.
    The advantage of this method is, on the one hand, that start-stop operations of internal combustion engines 2 with automatic or dual-clutch transmissions independently of the transmission and its influence can be examined. On the other hand allows for internal combustion engines 2 with manual transmissions very good reproducibility of engagement events, since it The use of the on-board clutches during testing would lead to wear and tear which could distort the result.
    权利要求:
    Claims (12)
    [1]
    1. A method for testing the behavior of an internal combustion engine (2) with a start-stop system during a starting process of the internal combustion engine (2), with a test bench (1), an electric dynamometer (4) and a shaft (4) with the dynamometer (4). 5) connected to at least one switchable coupling (7), wherein the coupling unit (6) with a crankshaft (3) of the internal combustion engine (2) is connected, characterized in that the internal combustion engine (2) with the clutch (7 ) is started bringing the dynamometer (4) to synchronous speed with the internal combustion engine (2), that upon reaching the synchronous speed, the clutch (7) is closed, and that after closing the clutch (7) by the dynamometer (4) a closing vehicle clutch is simulated, wherein by the dynamometer (4) a load torque is applied to the shaft (5), which of the coupling characteristic of a closing n vehicle clutch corresponds.
    [2]
    2. A method for testing the behavior of an internal combustion engine (2) with a start-stop system during a stopping operation of the internal combustion engine (2), with a test stand (1) sofesen an electric dynamometer (4) and with the dynamometer (4) via a shaft (5 ) having at least one switchable coupling (7), wherein the coupling unit (6) is connected to a crankshaft (3) of the internal combustion engine (2), characterized in that an opening vehicle clutch is simulated by the dynamometer (4) is, while the internal combustion engine (2) is operated with the clutch (7), wherein by the dynamometer (4) a torque characteristic is applied to the shaft (5), which corresponds to the clutch characteristic of an opening vehicle clutch that the speed of the internal combustion engine (2) with the speed (the torque ) of the dynamometer (4) is synchronized, and that after the synchronization, the clutch (7) is opened and after opening the clutch (7) the internal combustion engine (2) is stopped.
    [3]
    3. The method according to claim 1 or 2, characterized in that during the start or stop operation in the coupling unit (6) at least one measured value, preferably the rotational speed (nif n2) on the input and / or output side of the clutch (7), at least one Storage temperature (Ti, T2), the torque (Mi) and / or shaft vibrations and / or accelerations, is measured.
    [4]
    4. The method according to claim 3, characterized in that the at least one measured value is transmitted to an actuating unit (14) and / or an automation unit (16).
    [5]
    5. The method according to any one of claims 1 to 4, characterized in that the coupling (7) of the coupling unit (6) by the actuating unit (14) is actuated.
    [6]
    A method according to any one of claims 1 to 4, characterized in that the dynamometer (4) and / or the actuator (14) are controlled by an automation unit (16) on the basis of a start / stop simulation program (17).
    [7]
    7. The method according to any one of claims 1 to 5, characterized in that the shaft (5) by the coupling unit (6) is mounted.
    [8]
    A test stand (1) for testing the start-stop performance of an internal combustion engine (2), an electric dynamometer (4) connectable to a crankshaft (3) of the internal combustion engine (2) and a clutch unit connected to the dynamometer (4) via a shaft (5) (6) with at least one switchable clutch (7) for connecting and disconnecting the dynamometer (4) to and from the internal combustion engine (2), for carrying out the method according to one of claims 1 to 7, characterized in that the coupling unit (6) at least one Preferably, the dynamometer side arranged shaft bearing (8).
    [9]
    9. test stand (1) according to claim 8, characterized in that the coupling unit (6) at least one sensor (9, 10, 11, 12, 13) for measuring the shaft speed (nlf n2), the bearing temperature (Tlf T2), the torque ( Mi) and / or of wave vibrations.
    [10]
    A test stand (1) according to claim 8 or 9, characterized in that the coupling unit (6) is connected to an actuating unit (14).
    [11]
    11. A test stand (1) according to any one of claims 8 to 10, characterized in that the actuating unit (14) and / or the dynamometer (4) is connected to an automation system (16).
    [12]
    A test rig (1) according to claim 11, characterized in that the automation system (16) comprises a start / stop simulation program (17).
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    同族专利:
    公开号 | 公开日
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP2002286588A|2001-03-26|2002-10-03|Meidensha Corp|Device for testing start of engine|
    JP2003057152A|2001-08-13|2003-02-26|Meidensha Corp|Start testing apparatus for engine|
    AT10813U2|2009-06-16|2009-10-15|Avl List Gmbh|TEST ARRANGEMENT|
    JPS56132438A|1980-03-22|1981-10-16|Toyota Motor Corp|Clutch mechanism in testing device for internal combustion engine|
    JP3671565B2|1996-12-18|2005-07-13|株式会社明電舎|Test system|
    US7926336B2|2008-09-04|2011-04-19|Vickio Jr Louis P|Dynamometer|
    JP5758659B2|2011-03-17|2015-08-05|トヨタ自動車株式会社|Engine test apparatus and engine test method|GB2576025A|2018-08-01|2020-02-05|Comb Order Ltd|Synchronous real time dynamometer|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50622/2014A|AT516025B1|2014-09-10|2014-09-10|METHOD FOR TESTING THE BEHAVIOR OF A COMBUSTION ENGINE|ATA50622/2014A| AT516025B1|2014-09-10|2014-09-10|METHOD FOR TESTING THE BEHAVIOR OF A COMBUSTION ENGINE|
    EP15184186.3A| EP2998719B1|2014-09-10|2015-09-08|Method for testing the behaviour of a combustion engine|
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