CN116176451A - Method for diagnosing plausibility of signals in electrical systems - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0092—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption with use of redundant elements for safety purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K26/00—Arrangements or mounting of propulsion unit control devices in vehicles
- B60K26/02—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/429—Current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2250/00—Driver interactions
- B60L2250/26—Driver interactions by pedal actuation
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- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Auxiliary Drives, Propulsion Controls, And Safety Devices (AREA)
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Abstract
本发明涉及一种用于诊断电动车辆中的加速踏板信号的方法，其中针对不是加速踏板信号的至少一个第二电气信号进行合理性检查。
The invention relates to a method for diagnosing an accelerator pedal signal in an electric vehicle, wherein a plausibility check is carried out for at least one second electrical signal which is not an accelerator pedal signal.
Description
技术领域technical field
本发明涉及一种用于诊断电气系统的信号的合理性的方法。The invention relates to a method for diagnosing the plausibility of signals of an electrical system.
背景技术Background technique
在诊断电动车辆的加速踏板信号时，需要针对第二独立信号进行合理性检查。为此，双重地检测加速踏板的信号。加速踏板的信号包含关于是否踩下加速踏板、即是否加速的信息。两个加速踏板信号中的每一个都单独发送到计算单元。两个信号单独进行电气处理并且在软件中相互独立地加以计算，然后相互比较。如果两个信号都是合理的，则信号是没有错误的并且可以肯定地完成诊断。When diagnosing the accelerator pedal signal in an electric vehicle, a plausibility check is required for a second independent signal. For this purpose, the accelerator pedal signal is double checked. The accelerator pedal signal contains information about whether the accelerator pedal is depressed, ie whether the accelerator is being accelerated. Each of the two accelerator pedal signals is sent individually to the computing unit. The two signals are electrically processed separately and calculated independently of each other in the software and then compared with each other. If both signals are reasonable, the signals are not faulty and the diagnosis can be done with certainty.
缺点是电气组件的预期成本较高。The downside is the expected higher cost of electrical components.
发明内容Contents of the invention
为了节省成本，存在仅执行一次加速踏板信号的电气系统。出于这个原因存在第二单独信号，在诊断期间必须针对所述加速踏板信号检查所述第二单独信号的合理性。In order to save costs, there are electrical systems that perform the accelerator pedal signal only once. For this reason there is a second separate signal, which has to be checked for plausibility during the diagnosis against the accelerator pedal signal.
因此，在诊断期间需要针对另外的信号进行合理性检查。Therefore, plausibility checks for additional signals are required during diagnosis.
本发明的优点是一种用于诊断加速踏板信号的方法，所述加速踏板信号在电动车辆中仅提供一个信号。An advantage of the invention is a method for diagnosing an accelerator pedal signal, which in an electric vehicle provides only one signal.
有利地使用至少一个不是加速踏板信号的第二信号来进行合理性检查。The plausibility check is advantageously carried out using at least one second signal which is not an accelerator pedal signal.
第二单独信号是电流信号，其中当踩下加速踏板时，电流从电动车辆的电池流入电动车辆的电动机，其中从电动车辆的电池流入电动车辆的电动机的电流在踩下加速踏板时增加，并且在未踩下加速踏板时再次下降。The second separate signal is a current signal in which current flows from the battery of the electric vehicle to the motor of the electric vehicle when the accelerator pedal is depressed, wherein the current flowing from the battery of the electric vehicle to the motor of the electric vehicle increases when the accelerator pedal is depressed, and Descending again without depressing the accelerator pedal.
因此，在电气系统的定义状态下，加速踏板信号与流过电动机的电流成比例。Therefore, in a defined state of the electrical system, the accelerator pedal signal is proportional to the current flowing through the electric motor.
有利地，当踩下电动车辆的加速踏板并且电动车辆的电动机通电时，所述诊断开始。Advantageously, said diagnosis starts when the accelerator pedal of the electric vehicle is depressed and the electric motor of the electric vehicle is energized.
只要所述电气系统通电，所述诊断就连续运行，其中诊断计算的释放是通过满足定义的参数Cond1和Cond2来进行的。The diagnostic runs continuously as long as the electrical system is energized, wherein the release of the diagnostic calculation is carried out by satisfying the defined parameters Cond1 and Cond2.
根据本发明，Cond1是电动车辆的速度，而Cond2是在踩下加速踏板时从电池流向电动机的电流。因此，该诊断易于应用，并且可以适配于各种电气系统。According to the invention, Cond1 is the speed of the electric vehicle, and Cond2 is the current flowing from the battery to the electric motor when the accelerator pedal is depressed. Therefore, the diagnosis is easy to apply and can be adapted to various electrical systems.
有利地测量从电池流向电动机的电流的电流梯度和加速踏板信号的梯度。The current gradient of the current flowing from the battery to the electric motor and the gradient of the accelerator pedal signal are advantageously measured.
由于两个梯度都可以既为正又为负，因此形成梯度的绝对值并且只使用所述绝对值。由此诊断可以既在负梯度又在正梯度时使用。因此更频繁地计算诊断。Since both gradients can be both positive and negative, the absolute value of the gradient is formed and only used. The diagnosis can thus be used both on negative and positive gradients. The diagnoses are therefore calculated more frequently.
如果电流梯度大于定义的阈值，则在电流梯度大于定义的阈值时加速踏板信号的梯度应该超过一个值。由此可以安全且简单地识别出错误情况。如果只有一个梯度变化而另一个梯度没有变化，则出现错误情况。If the current gradient is greater than a defined threshold value, the gradient of the accelerator pedal signal should exceed a value when the current gradient is greater than the defined threshold value. Error situations can thus be detected safely and easily. An error condition occurs if only one gradient changes and the other does not.
进一步的优点可以从附图和说明书中得出。Further advantages can be derived from the drawings and the description.
附图说明Description of drawings
图1示出了用于诊断加速踏板信号的方法。FIG. 1 shows a method for diagnosing an accelerator pedal signal.
图2示出了电流梯度和加速踏板梯度的信号。Figure 2 shows the signals of the current gradient and the accelerator pedal gradient.
具体实施方式Detailed ways
图1示出了用于诊断电动车辆中的加速踏板信号SGas和第二单独电气信号的方法。电动车辆包括电池和电动机。如果要加速，在踩下加速踏板时电流从电池流入电动车辆的电动机。在该实施例中，第二单独信号是电流信号Sstrom。从电动车辆的电池流入电动车辆的电动机的该电流在踩下加速踏板时（即在加速时）增加，并且在未踩下加速踏板时（也就是收回油门时）下降。该电流是第二单独信号。FIG. 1 shows a method for diagnosing an accelerator pedal signal S Gas and a second separate electrical signal in an electric vehicle. Electric vehicles include batteries and electric motors. To accelerate, current flows from the battery to the electric vehicle's electric motor when the accelerator pedal is depressed. In this embodiment, the second separate signal is the current signal S strom . This current flowing from the electric vehicle's battery to the electric vehicle's electric motor increases when the accelerator pedal is depressed (ie, when accelerating), and decreases when the accelerator pedal is not depressed (ie, when the accelerator is retracted). This current is the second separate signal.
如果电动车辆静止，即电动机未通电，则诊断不会开始。当电动车辆的加速踏板被踩下并且电动车辆的电动机通电时，诊断开始。If the electric vehicle is stationary, i.e. the electric motor is not powered, the diagnostics will not start. The diagnosis starts when the accelerator pedal of the electric vehicle is depressed and the electric motor of the electric vehicle is powered on.
诊断计算的释放是通过满足定义的参数来进行的。这些参数在图1中用Cond1和Cond2标记。在该实施例中，Cond1是电动车辆的速度，当踩下加速踏板时该速度增大。The release of the diagnostic calculation is carried out by satisfying the defined parameters. These parameters are labeled Cond1 and Cond2 in Figure 1. In this embodiment, Cond1 is the speed of the electric vehicle, which increases when the accelerator pedal is depressed.
例如，可以通过在电动机中或在车轮上检测转速来确定电动车辆的速度，其中在已知轮胎尺寸的情况下可以计算速度。For example, the speed of an electric vehicle can be determined by detecting the rotational speed in the electric motor or at the wheels, where the speed can be calculated given the tire size is known.
Cond2是当踩下加速踏板时从电池流向电动机的电流。但是，Cond2也可以是所述系统的其他信号，例如电池电压，当踩下加速踏板时该电池电压也会变化。Cond2 is the current that flows from the battery to the motor when the accelerator pedal is depressed. However, Cond2 could also be other signals of the system, such as the battery voltage, which also changes when the accelerator pedal is depressed.
作为附加条件（Cond3），应确保不进行回收。在这种情况下，电流也从电动机流向电池，而无需踩下加速踏板。在电动制动时就是这种情况。As an additional condition (Cond3), it should be ensured that no recycling takes place. In this case, current also flows from the electric motor to the battery without depressing the accelerator pedal. This is the case during electric braking.
如果在步骤100中确定满足所有条件，则在110中开始诊断。定义的值因电动机的尺寸和性能而不同。从而可能的是，当Cond1超过2km/h并且Cond2超过4A时开始诊断。待定义的值可以适配于不同的电气系统和应用。如果满足所有参数，则在120中作为新信号一方面计算电流梯度，即电动机中的电流随时间的变化，另一方面计算加速踏板信号的梯度，即加速踏板信号随时间的变化。计算结果在130中输出。If it is determined in
在图2中示出两个信号。从图2中可以看出，在电气系统的定义状态下，加速踏板信号与流过电动机的电流成比例。具体而言，评估电动机中的电流梯度和加速踏板信号的梯度。如果电机的电流梯度大于阈值，则加速踏板信号的梯度也应该超过预期值。在这种情况下，加速踏板信号是合理且无错误的，并且以肯定的方式结束诊断。否则，将识别出加速踏板信号的合理性错误并将该错误报告给诊断管理器。Two signals are shown in FIG. 2 . It can be seen from Figure 2 that in a defined state of the electrical system, the accelerator pedal signal is proportional to the current flowing through the motor. Specifically, the current gradient in the electric motor and the gradient of the accelerator pedal signal are evaluated. If the current gradient of the motor is greater than the threshold, the gradient of the accelerator pedal signal should also exceed the expected value. In this case, the accelerator pedal signal is plausible and error-free, and the diagnosis is concluded in the affirmative. Otherwise, a plausibility error of the accelerator pedal signal is detected and reported to the diagnostic manager.
因此，可以通过以下参数设置诊断：Therefore, diagnostics can be set via the following parameters:
电流梯度参数：在正常运行中，在电动机通电期间产生电流梯度。如果该电流梯度超过电流梯度参数中设定的阈值，则计算加速踏板信号的诊断。Current Gradient Parameter: In normal operation, a current gradient is generated during energization of the motor. If this current gradient exceeds the threshold set in the current gradient parameter, a diagnosis of the accelerator pedal signal is calculated.
梯度加速踏板信号：在无错误状态下，加速踏板信号的梯度应该超过加速踏板梯度参数中设定的阈值，于是加速踏板信号无错误。否则将报告错误。Gradient accelerator pedal signal: In the error-free state, the gradient of the accelerator pedal signal should exceed the threshold set in the accelerator pedal gradient parameter, so the accelerator pedal signal is error-free. Otherwise an error will be reported.
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| DE102021213359.2A DE102021213359A1 (en) | 2021-11-26 | 2021-11-26 | Procedure for diagnosing the plausibility of a signal from an electrical system |
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