Continental Teves, Ag and Company Ohg

Peter Oehler

Wolfgang Fey

Frank Michel

Mario Engelmann

Micha Heinz

Axel Schmitz

René Trapp

Wolfgang Joeckel

Markus Jäger

A method for checking a control circuit for an inductive load, wherein one or two currents are measured and evaluated. An arrangement for carrying out such a method is also disclosed.

Method and arrangement for checking a control circuit of an inductive load

Method in which the current is measured inside an integrated PWM control circuit using at least one A/D converter which is likewise integrated in the circuit is described. The PWM controller is provided for the purpose of driving inductive loads and is arranged, in particular, in an electronic circuit of an electronic controller for a motor vehicle braking system. Before determining the actual current of the PWM controller, which is determined using the at least one A/D converter, the current is smoothed using a low-pass filter. A circuit arrangement for carrying out the above method and its use in electronic motor vehicle control systems is also described herein.

Method and pulse-width-modulated current control circuit for driving inductive loads in motor vehicles

The invention relates to an electronic motor vehicle control system having at least one valve actuating circuit which controls a load current by means of pulse width modulation. The actuating circuit has at least one electronic current measuring circuit which has at least one measurement path with at least one analog/digital converter. The analog/digital converts an analog measurement signal of the load current into a digital measurement signal of the load current and is actuated or designed in such a way as to carry out a plurality of current measurements per PWM period. The at least one measurement path of the current measurement circuit has a signal conservation circuit which provides the analog measurement signal of the load current substantially unchanged, and independent of the actual load current, for at least a defined hold time (t, t).

Electronic motor vehicle control system with current measuring circuit

An electronic circuit for correcting at least one digital measurement signal (&#x3a3;&#x394;n, &#x3a3;&#x394;) comprising at least one measurement channel having a sigma-delta modulator and a correction circuit. The sigma-delta modulator changes an analog measurement signal into a digital measurement signal in the form of a binary value sequence. The correction circuit corrects the digital measurement signal (&#x3a3;&#x394;n, &#x3a3;&#x394;) as a function of at least one correction datum (trim), wherein the correction circuit comprises at least one adding element and at least one multiplexer. The digital measurement signal is corrected in that the correction datum (trim) is weighted by means of the multiplexer and the adding element as a function of the digital measurement signal (&#x3a3;&#x394;n, &#x3a3;&#x394;).

Electronic circuit for correcting at least one digital measurement signal

An electronic controller for motor vehicle control systems having at least one valve actuation circuit is described herein. The electronic controller uses pulse width modulation to control the load current (i) flowing through an essentially inductive load (L), and has at least one electronic current measuring circuit which has at least one analog/digital converter which converts an analog measurement signal for the load current (i) into a digital measurement signal for the load current (i). The at least one analog/digital converter is a sigma-delta modulator. A method for measuring current using sigma-delta modulation and to the use of the electronic controller in a motor vehicle brake system is also described herein.

Method and electronic regulator with a current measuring circuit for measuring the current by sense-FET and sigma-delta modulation

The present invention relates to a method for reducing deviations between the effective current and the measured current in a pulse-width-modulated current control, in particular for electronic brake control units of motor vehicles, wherein the measured current is determined at a certain predefined time within an actuation period and a compensation occurs by means of temperature-responsive and/or supply-voltage-responsive compensation variables which are added to the measured current such that a corrected nominal current is available for current control. The invention also relates to a circuit arrangement for actuating several inductive loads and comprises a circuit for PWM control of the load current. The method of the invention is implemented as a program in a microcomputer or microcomputer system that is electrically connected to the PWM circuit.

Method and circuit system for calibrating voltage and temperature deviations of the effective current of hydraulic valves in a PWM drive

The present invention relates to a circuit arrangement for the error-free analog-to-digital conversion of N analog input signals Nin a plurality of digital output signals corresponding to the number N using exactly one analog-to-digital converter, wherein N&#x3e;=1, wherein further N' other redundancy inputs N&#x2032;are provided, and being fed to the said analog-to-digital converter, wherein the N and the N&#x2032; inputs are supplied to at least one analog multiplexer, and wherein the circuit arrangement has an error monitoring functionality, and each input signal Nis counter to the corresponding redundancy signal N&#x2032;. The invention also relates to the use of the circuit arrangement in electronic motor vehicle control units with an anti-lock function.

Electronic circuit arrangement for error-free analog/digital conversion of signals

The present invention relates to a circuit arrangement for controlling the current in loads by modulation of the pulse width, comprising at least two driver stages () provided for the actuation of the loads, and one or more current measuring devices (), and at least one multiplexer () conducting current measurement signals by way of the load current in the driver stages to one or more current measuring devices in dependence on one or more control signals () for the multiplexer, said control signals being produced by a checking device (). The invention further describes a method wherein the moment of the current measurements is controlled by an organized chronological order.

Circuit arrangement and method for measuring current in vehicle braking systems

A circuit for detecting a defect of electronic components in an electronic control unit includes an output for driving a load (). A redundant measurement of the current (I) is executed at the contacts (G, S, D), in particular at the driven contacts (S, D), of one or more semiconductor circuit elements, and an error function of a semiconductor circuit element is detected when the comparison of two current values (I, I, I) by way of the current flowing through a load (') indicates an unequal current distribution. This circuit is of use in electronic brake force or driving dynamics controllers for motor vehicles.

Method and circuit for detecting a fault of semiconductor circuit elements and use thereof in electronic regulators of braking force and of dynamics movement of vehicles

The present invention relates to a circuit configuration with an A/D converter, especially for applications that are critical in terms of safety, which is especially characterized by a ramp signal generator for generating a ramp voltage that is delivered to the input of the A/D converter, and a test circuit for activating a test cycle which comprises a first run of the ramp, by which a reference measurement of the ramp signal generator is carried out for compensating component tolerances, and comprises a second run of the ramp where an error signal is output when the value that is calculated for a transmission characteristic of the A/D converter lies outside a predetermined tolerance range of the measured value of the transmission characteristic.

Growing community of inventors

Frankfurt am Main, Germany

Peter Oehler