The present disclosure relates to a device for monitoring a high-voltage contactor in a vehicle. In one implementation, the high-voltage contactor has a coil with an anchor, the coil is energized with a coil current or a coil voltage to switch the high-voltage contactor, and the high-voltage contactor is switched by a motion of the anchor, thus also changing the inductivity of the coil. The device may include an interface for reading in a measurement value function for the generated coil voltage and/or for the generated coil current during the switching cycle of the high-voltage contactor; an analysis device for determining a motion information representing a travel distance of the anchor based on the measurement value function; and a comparison device for comparing the motion information with a threshold value information. A fault signal is generated when the motion information falls below the threshold information.

Systems and methods are described for monitoring a high voltage electrical system in a vehicle. An interface circuit is configured to provide isolation between a high voltage component of the vehicle and a control module. The interface circuit comprises a high voltage constant current source, a voltage threshold detector and an electrical isolation circuit. The high voltage constant current source is configured to receive an input at a first voltage from the high voltage component. The voltage threshold detector is configured to receive an output from the high voltage constant current source and to output a signal to indicate whether the voltage of the high voltage component is at, or below, a desired voltage. The electrical isolation circuit is configured to receive the output signal from the voltage threshold detector, decouple the output signal from the high voltage component and, in response to receiving the output signal from the voltage threshold detector, output a signal at a second voltage to the control module.

Systems, devices, methods, and techniques are disclosed for open load detection in the connections coming from output stages of electrical systems.

A sampling circuit monitors a high voltage level in an electric vehicle drive. A resistor ladder receives a drive voltage to be sampled and provides sufficient isolation to allow use of low cost switching devices. An N-channel MOSFET is connected between the ladder and a reference resistance. A junction between the source terminal of the MOSFET and the reference resistance provides a sampled voltage output adapted to be input to an analog-to-digital converter. A discrete optocoupler has an output side with a collector and an emitter. The collector is coupled to the resistor ladder, and the emitter is connected to a gate terminal of the MOSFET and coupled to the ground reference by a load resistor.

Measurement system and procedure suitable for measuring a voltage differential, the system comprising a measurement unit (1) having a first ground (10) as voltage reference and comprising a microcontroller (7) with an analog-digital converter (5), a sensor (2) having a second ground (20) as voltage reference, said second ground (20) being able to exhibit a potential difference with respect to the first ground (10), said measurement unit (1) having a first input (11) connected directly to the signal output (21) of the sensor (2), and a second input (12) connected directly to said second ground (20), the first and second inputs (11, 12) being linked to digital inputs (61, 62) of the microcontroller (7) through circuits for conditioning (31, 32, 41, 42) and analog-digital conversion (51, 52).

This disclosure describes techniques for separately determining isolation resistances from nodes of a power system of an electric vehicle (EV) to a chassis of the EV. Processing circuitry may determine a first isolation resistance between a first node of the power system in the EV and a chassis of the EV, determine a second isolation resistance between a second node of the power system in the EV and the chassis of the EV, determine that the first isolation resistance or the second isolation resistance is less than a threshold resistance, and output information based on the determination that the first isolation resistance or the second isolation resistance is less than the threshold resistance.

A communication device has a first data interface and a second data interface. A safe protection of the communication device against malicious code even under an easily breakable communication line between the communication device and a remote server is achieved by an intermediate protection unit located in a data communication line between the two data interfaces, wherein the intermediate protection unit blocks data in the direction from the second to the first data interface.

A method for vehicle electrical system diagnosis by means of a regulator, which is configured to regulate the voltage supplied by a generator via a converter for a vehicle electrical system of a vehicle by outputting an output signal, wherein the method comprises the following steps: detecting an output signal by way of a control device, ascertaining an instantaneous power output at the vehicle electrical system on the basis of the detected output signal, and analyzing the ascertained power output for diagnosis of the vehicle electrical system and at least one electrical consumer which is connected to the vehicle electrical system.

The present disclosure relates to a method for monitoring an on-board electrical system of a vehicle having at least one distributor and a load that are connected together via a cable. In one implementation, the method includes reading in a sequence of data for a number of parameters representing information about operation of the vehicle by a driver and/or about a state of the vehicle and/or a state of the driver and/or a driving environment; classifying the data as a normal value or an error value; and evaluating the data classified as an error value or a normal value. The normal values may lie within a state space separated from the error values by a discrimination limit. Evaluating the data classified as an error value may include determining if the data classified as an error value fulfils a criterion, and evaluating the data classified as a normal value may include statistically evaluating to determine a stochastic parameter and determining if the stochastic parameter exceeds a threshold value.

The disclosure includes embodiments for determining a working status of a set of sensors onboard in a connected vehicle through a validation of roadway segment activity data. In some embodiments, a method for the connected vehicle includes receiving, via a communication unit of the connected vehicle, a Vehicle-to-Everything (V2X) message that includes off-board roadway segment activity data. The method includes generating onboard roadway segment activity data of the connected vehicle. The method includes determining a working status of a set of onboard sensors of the connected vehicle based on an evaluation between the onboard roadway segment activity data and the off-board roadway segment activity data. The method includes modifying an operation of a vehicle control system of the connected vehicle based on the working status of the set of onboard sensors.