Method for temperature sensor correction for a motor vehicle

Abstract

The invention relates to a method for temperature sensor correction for a motor vehicle, comprising the following process steps. In a first process step, an input signal from a temperature sensor is acquired. In a second process step, the input signal is derived twice, whereby a first derivative and a second derivative of the temperature sensor's input signal are formed, the input signal being a continuous input signal. In a third process step, an offset signal is calculated based on the derived temperature sensor input signal. In a fourth process step, the offset signal is smoothed using at least one filter. In a fifth process step, the offset signal is added to the temperature sensor's input signal, thereby generating a corrected input signal.

Description

[0001] The present invention relates to a method for temperature sensor correction for a motor vehicle.

[0002] In today's modern vehicles, the safety and reliability of temperature sensors are crucial for ensuring the functionality of systems such as cooling systems, engine controls, and safety functions. Temperature sensors used in series production must have a long service life to guarantee the reliability and safety of these systems. To meet these requirements, sensors with a robust measuring tip and a housing exhibiting high thermal inertia are typically used. While these measures reduce the risk of mechanical failure, they also have the disadvantage of high thermal inertia, which makes it difficult to detect transient temperature spikes and measure steady-state conditions in a timely manner.

[0003] This can lead to significant problems, especially when measuring temperature spikes, as the sensors only react several seconds after the overheating occurs. This can result in inadequate component protection, potentially leading to damage to the sensors and possibly other components as well.

[0004] To solve these problems, a new temperature sensor is needed that offers a long service life but also lower thermal inertia than conventional sensors. This application includes a software solution that enables the timely detection of temperature spikes and rapid measurement of steady-state conditions without compromising the reliability and safety of the sensors.

[0005] The present invention relates to such an innovative system, which has been specially developed to improve upon the problems of modern motor vehicles from the prior art and to raise the functionality of the motor vehicle to a new level.

[0006] According to the invention, a method for temperature sensor correction for a motor vehicle according to claim 1, and a motor vehicle for carrying out the method for temperature sensor correction according to claim 9, are provided.

[0007] Advantageous embodiments can be found in the dependent claims and the description.

[0008] The invention relates to a method for temperature sensor correction for a motor vehicle, comprising the following process steps. In a first process step, an input signal from a temperature sensor is acquired. In a second process step, the input signal is differentiated twice, whereby a first derivative and a second derivative of the temperature sensor's input signal are calculated, the input signal being a continuous signal. In a third process step, an offset signal is calculated based on the two derivatives of the temperature sensor's input signal. In a fourth process step, the offset signal is smoothed using at least one filter. In a fifth process step, the offset signal is added to the temperature sensor's input signal, thereby generating a corrected input signal.

[0009] In a further advantageous implementation, the input signal of the temperature sensor is sampled at a sampling rate of 10 Hz, i.e., at intervals of 100 ms. The sampling rate is the number of samples or measurements of a signal per unit of time. It is specified in Hertz (Hz) and describes the speed at which a signal is sampled.

[0010] In a further development of the method, a PT1 filter is used to smooth the offset signal and / or the input signal of the temperature sensor.

[0011] A PT1 filter can be used to reduce interference signals in the input signal of the temperature sensor and / or to filter and smooth the input signal.

[0012] In a further advantageous implementation, the filter is designed to remove jitter generated by the first and second derivatives of the temperature sensor's input signal. Jitter is a type of noise that affects the time intervals between individual signal pulses. It can occur at various levels, such as time jitter, phase jitter, or amplitude jitter.

[0013] In a training course, the offset signal is calculated taking into account a characteristic map of the vehicle. For example, the characteristic map can relate a temperature change rate to the temperature of a component. This characteristic map can be multidimensional.

[0014] In a further education course, the first derivative of the temperature sensor's input signal represents the rate of change of the temperature sensor's input signal in Kelvin per second (K / s). In other words, the first derivative represents the rate of temperature change of the temperature sensor.

[0015] In a further education course, the second derivative of the temperature sensor's input signal represents the rate of change of the temperature sensor's input signal in Kelvin per second. 2 (K / s^2). In other words, the second derivative represents the acceleration of the temperature change of the temperature sensor.

[0016] By using the two derivatives of the input signal, the offset signal can be dynamically calculated based on a change in the input signal, in particular the rate of temperature change of the temperature sensor and / or the acceleration of the temperature change of the temperature sensor.

[0017] In this advanced training, the corrected input signal has a smaller time constant than the temperature sensor, relative to an actual change in component temperature. This allows temperature spikes to be detected promptly, even though the temperature sensor only reports them with a delay.

[0018] In a further training course, the offset signal is dynamically dependent on the rate of change of the temperature sensor's input signal and the rate of change of the temperature sensor's input signal. In other words, the offset signal depends on the first and second derivatives of the offset signal.

[0019] In an advantageous further development, the input signal of the temperature sensor is corrected by adding an offset signal, whereby the offset signal dynamically depends on the rate of change of the temperature sensor's input signal. Thus, no steady-state correction takes place.

[0020] The invention also relates to a motor vehicle which is designed to carry out the method for temperature sensor correction according to one of the preceding claims.

[0021] In a further development, the motor vehicle includes a processing unit, wherein the processing unit is designed to execute the method for temperature sensor correction.

[0022] In an advantageous further development, the processing device includes at least one microcontroller and / or FPGA and / or processor which is trained to perform the tasks described above.

[0023] In an advantageous further development, the processing unit is designed as a single unit or can be distributed throughout the vehicle.

[0024] The invention is described below by way of example only, with reference to the drawings. The drawings show: Fig. Figure 1 shows a method for temperature sensor correction for a motor vehicle according to an embodiment of the invention.

[0025] Fig.Figure 1 shows a method for temperature sensor correction for a motor vehicle, comprising the following process steps. In a first process step, an input signal from a temperature sensor is acquired, S1. In a second process step, the input signal is differentiated twice, forming a first derivative and a second derivative of the temperature sensor input signal, where the input signal is a continuous input signal, S2. In a third process step, an offset signal is calculated from the differentiated temperature sensor input signal, S3. In a fourth process step, the offset signal is smoothed using at least one filter, S4. In a fifth process step, the offset signal is added to the temperature sensor input signal, resulting in a corrected input signal, S5.

[0026] The invention is not limited to the described embodiments. Within the scope of the invention, all described and / or drawn features can be combined with one another as desired, unless otherwise stated. Reference sign S1-S5 process steps

Claims

[1] Method for temperature sensor correction for a motor vehicle, comprising the following process steps: - Capturing an input signal from a temperature sensor, (S1); - Two derivations of the input signal, wherein a first derivative and a second derivative of the input signal of the temperature sensor are formed, where the input signal is a continuous input signal, (S2); - Calculating an offset signal based on the two derivatives of the input signal of the temperature sensor, (S3); - Smoothing the offset signal with at least one filter, (S4); - Adding the offset signal to the input signal of the temperature sensor, thereby producing a corrected input signal, (S5). [2] Method for temperature sensor correction for a motor vehicle, according to claim 1, characterized by , that a PT1 filter is used to smooth the offset signal. [3] Method for temperature sensor correction for a motor vehicle, according to one of the preceding claims, characterized by , where the offset signal is calculated taking into account a characteristic map of the motor vehicle. [4] Method for temperature sensor correction for a motor vehicle, according to one of the preceding claims, characterized by , that the input signal of the temperature sensor is processed by an input filter, where the input filter is a PT1 filter. [5] Method for temperature sensor correction for a motor vehicle, according to one of the preceding claims, characterized by , that the first derivative of the temperature sensor's input signal is the rate of change of the temperature sensor's input signal in Ks represented. [6] Method for temperature sensor correction for a motor vehicle, according to one of the preceding claims, characterized by, that the second derivative of the temperature sensor's input signal is the rate of change of the temperature sensor's input signal in Ks2 represented. [7] Method for temperature sensor correction for a motor vehicle according to one of the preceding claims, characterized by , that the corrected input signal has a smaller time constant than the temperature sensor with respect to a real change in a component temperature. [8] Method for temperature sensor correction for a motor vehicle, according to one of the preceding claims, characterized by , that the offset signal is dynamically dependent on the rate of change of the input signal of the temperature sensor and the rate of change of the input signal of the temperature sensor. [9] Motor vehicle designed to carry out the method for temperature sensor correction according to one of the preceding claims. [10] Motor vehicle, according to claim 9, characterized by that the motor vehicle includes a processing unit, wherein the processing unit is configured to perform the temperature sensor correction method.

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