摘要:
An electronic device includes a sensor which detects acceleration values, and a control unit linked to the sensor. The control unit drives switching elements, which are disposed in a series circuit including at least one squib. When the switching elements are driven, the squib receives a current. This current flows at the same time through the also series-connected resistor, across which a voltage drop arises, which is analyzed by a comparator. The pulse duty factor of the current driving is modified as a function of the amperage of the current flowing through the squib.
摘要:
A watchdog circuit (WD) monitors the function of the processor (MC) in that the processor (MC) outputs a cyclically repeating test signal to the watchdog circuit (WD), and the watchdog circuit (WD) generates a reset signal (RST) for the processor (MC) if the test signal (WDS) does not appear in a time slot (S1, S2) specified by the watchdog circuit (WD). The width of the time slot (S1, S2) can be increased in the starting phase of a program sequence of the processor (MC).
摘要:
The simplified signal-processing circuit arrangement for processing and evaluating signals indicative of the status of an FSR-foil pressure sensor utilized in a seat-occupancy detection device, makes use of the fact that an application-oriented, integrated circuit, present in a motor vehicle having digital open-loop and closed-loop control functions implemented in a microcontroller MCU, contains a highly precise, switchable test-voltage source. One end of a circuit containing the FSR-foil is connected to a switching output VTA of the ASIC carrying the highly precise test voltage. The other end of this circuit is connected to a port of the MCU. A measuring voltage, which is a function of the status-contingent current intensity through the FSR-foil, drops off across a reference resistor connected in series to the FSR-foil, is fed to an analog-digital converter input of the MCU, and is converted therein into a digital signal indicating the occupancy status of the FSR-foil. Thus, using only one precise, switchable, d.c. voltage source, one port of the MCU and one ADC port, it is possible to evaluate the OCCUPIED/NOT OCCUPIED status of the FSR-foil, as well as to detect various fault conditions.
摘要:
Arranged in a triggering circuit of an airbag system are two switching elements which enclose a firing pellet. The switching elements are driven by way of assemblies and logic elements, respectively, in such a way that two separate criteria must be fulfilled for the transfer of each switching element into its conductive state.
摘要:
An apparatus for controlling motor vehicle safety devices has a plurality of sensors, each coupled to a control unit. The control unit in turn activates inertial restraining devices based on the output signals generated by the sensors.
摘要:
In a method for controlling the release of a passenger restraint system in a vehicle, an acceleration signal is measured and integrated with respect to time to obtain a velocity signal. A release threshold value for the velocity signal is determined. If the velocity signal then falls below the release threshold value, thus indicating a vehicle collision, the passenger restraint system is released. The release threshold value is controlled depending on the type of accident situation and upon the operating parameters of the vehicle to increase the release sensitivity of the passenger restraint system. For example, the release threshold value is adjusted based on the value of the velocity signal. If the velocity signal decreases in value, then the release threshold is lowered to a more sensitive value.
摘要:
In a method for controlling the release of a passenger restraint system in a vehicle, an acceleration signal is measured and integrated with respect to time to obtain a velocity signal. A release threshold value for the velocity signal is determined. If the velocity signal then falls below the release threshold value, thus indicating a vehicle collision, the passenger restraint system is released. The release threshold value is controlled depending on the type of accident situation and upon the operating parameters of the vehicle to increase the release sensitivity of the passenger restraint system. For example, the release threshold value is adjusted based on the value of the velocity signal. If the velocity signal decreases in value, then the release threshold is lowered to a more sensitive value.
摘要:
A safety device for a vehicle occupant comprising a restraint for the vehicle occupant, a sensing circuit for evaluating a vehicle condition, a control circuit for actuating the restraint in response to a predetermined vehicle condition, and two separate reserve energy storages for supplying electrical energy to the sensing and control circuits, respectively.
摘要:
In an evaluation process for output signals of an acceleration-sensitive sensor in restraint systems for vehicle occupants, the output signals of the sensor are picked up and evaluated periodically. In a normal, uncritical operating state the evaluation occurs after relatively long intervals of time. If indications suggest a critical operating state, that is, an accident, however the evaluation of the output signals of the sensor occurs at shorter intervals of time.
摘要:
To prevent spurious operation of a controlled operating element (12), typically a safety element which can be irreversibly triggered, such as a trigger or firing cartridge of a passenger restraint airbag, while providing for reliable operation in case of a crash of a vehicle in which the airbag is installed, a control signal is derived from a computer (10) processing input signals. The transmission of the control signals from the computer (10) to the operating element (12) is through a time delay stage (30) which has a time delay of sufficient length to permit the computer to correct, if necessary, signals from its output (16) and to carry out tests on the output signals from the computer apparatus. An evaluation circuit (18) continuously compares the output signals with check values. The check values may be derived from, for example a second computer similar to the computer, or from stored representative values. If the comparison indicates coincidence, the operating control signal from the computer is transmitted to the operating element (12). If, however, e.g. due to extraneous disturbances, a deviation between the test samples and the signals derived from the output (16) of the computer indicates a deviation, transmission of the control signals from the computer (10) to the operating element (12) is prevented, and the computer is controlled to repeat its computation, or part of a computation cycle.