Abstract:
A belt retractor for an occupant restraint system comprises a frame, a belt reel rotatably mounted in the frame, an electric motor drive coupled to the belt reel, a locking mechanism for selectively blocking the belt reel, and a vehicle-sensitive sensor. The locking mechanism is actuated by an actuator. An electronic control unit is provided with an input interface and an output interface. The vehicle-sensitive sensor is connected to the input interface, and the actuator and the electric motor drive are connected to the output interface.
Abstract:
A method of operating a resistance heating element and a device for carrying out the method are described. During a first step, the resistance of a resistor of the resistance heating element is determined at a known base temperature. In a second step, the resistance setpoint value is determined as a function of resistance of the resistor at the known base temperature and known temperature coefficients. The resistance heating element is activated by approximately setting the resistance setpoint value in order to heat the resistance heating element to the given setpoint temperature.
Abstract:
A rotary transmitter for registration of the steering angle of a motor vehicle, with a transmitter component (49) on which is provided a coding (51) of a predetermined number n of locally sequentially digital words (Wi) with a width of m bits (b1, b2, . . , Bm) in m adjacent to each other tracks, at least one detector (55) for essentially simultaneous registration of the individual bits (b1, b2, . . . , Bm) of a digital word (Wi), whereby the transmitter component (49) and at least the one detector (55) are movable relative to each other, and with an evaluation unit (11) to which is conducted the signal of at least the one detector (55). The evaluation unit (11) ascertains the absolute position of the transmitter component (49) relative to at least the one detector (55), at least one time, by evaluation of a predetermined number (p) of sequentially detected digital words (Wi), whereby the evaluation unit (11) assigns to a detected p-measure (Wi, Wi+1, . . . , Wi+p−1), consisting of the predetermined number (p) of sequentially detected digital words (Wi), a defined position value of the transmitter component (49) relative to at least the one detector (55). The coding is hereby designed in such manner that all sequences (Wi, W1+1, . . . , Wi+p−1) from among the sequential words (Wi) consisting of the predetermined number (p) are uniquely defined at least within a predetermined uniquely defined area (I. II) of coding (51) and that within each uniquely defined area (I, II) the digital words (Wi) are not uniquely defined.
Abstract:
A windshield wiper system (10) which includes an electrical drive motor (12) that makes available a driving moment for at least one windshield wiper (16) performing a back and forth movement on a pane to be cleaned. A signal processing arrangement (20) is provided which, by way of an electrical switching stage (18), controls or regulates the rotation rate of the drive motor (12) to a constant value.
Abstract:
An activation device for bringing an network interface of a computer network for a motor vehicle, with at least two bus lines, out of a sleep mode into a wake-up mode. The activation device includes a signal flank change detection circuit, which is coupled to the bus lines and a reference voltage. In the event of an interruption or in the event of a short-circuit of one of the bus lines to ground or to a supply voltage of the computer network, the circuit evaluates a signal arriving on the other, intact bus line and emits a wake-up signal for the activation of the network interface. The flank change detection circuit has two comparators (5, 7), which are connected to the bus lines (U-, U+) and via a voltage divider (19) to a reference voltage (V.sub.cc /2). A voltage offset is produced by the voltage divider (19), by which offset the network interface can be brought into wake-up mode in the event of a short-circuit of the bus lines between each other, even if it was in sleep mode when the fault occurred.
Abstract:
The invention discloses a method for detecting rotational speed fluctuations of an internal combustion engine, wherein in a first step it is checked whether the actual speed of the internal combustion engine deviates from a predeterminable desired speed by more than a predeterminable amount. In a second step, it is checked whether the time distance between two successive overtravels exceeds a predeterminable period of time; and, in a third step, it is finally determined that the rotational speed of the internal combustion engine is fluctuating if this time distance is less than the predetermined period of time. The method of the invention permits the rotational speed fluctuations of an internal combustion engine to be detected reliably while at the same time requiring little storage space and little computing time when realized by means of a computer.
Abstract:
The invention is directed to a method and an apparatus for adapting the characteristic of a final controlling element to eliminate disturbances and other undesired influencing quantities and, particularly for adapting the controller characteristic for the idle air charge control of internal combustion engines. A desired air quantity value issued by a regulator on the basis of various operating conditions is corrected by multiplicative and/or additive action prior to being delivered to an idle control element, for example, by means of which a change is effected in the cross-sectional area of the opening of a bypass valve arranged in the fuel metering arrangement of the internal combustion engine. This correction relates to adapting a characteristic of the idle control element with respect to offset and slope. This is accomplished by evaluating the output signals of at least one offset integrator or one slope integrator to generate an adapted electrical actuating quantity for the idle control element. The integrators are released in dependence on operating conditions and receive an input differential signal obtained from the signal indicative of the desired air quantity value from the regulator and a signal indicative of the actual air quantity.
Abstract:
The respective wheels of a vehicle have transducers (11, 12) associated therewith which provide pulse trains (S1, S2) upon revolution of the wheels, the pulses being either "mark" pulses if the transducer senses "correct pressure", or "space" pulses if the transducer senses "low pressure". The pulses from all the transducers are logically combined in a NOR-gate (23), and the output is connected via a common junction (J) to the count or shift inputs of a group of shift registers (22). The shift registers are individually reset by the pulses from the individual transducers. Thus, if one of the transducers signals "low pressure" conditions, the particular shift register (22) will not be reset, and, upon shifting through to its terminal count, will provide respective output signals to individually connected indicators (27). All the indicators are connected to a common, particularly acoustic warning signal indicator (19), and a test timing circuit (T, 31) is provided, enabled upon turning ON the main switch of the vehicle to provide a test cycle and a test warning output.
Abstract:
A circuit arrangement for linearizing the output signal of a probe such as a hot-wire probe used for quantitative air measurement in the intake manifold of an internal combustion engine which includes a log stage, a multiplier stage and an antilog stage connected in series, the probe signal being applied to the input of the log stage and the linearized output signal taken from the output of the antilog stage.