ELECTRONIC CIRCUIT FOR CONTROLLING AN ACTUATOR
First Claim
1. Electronic circuit for controlling an actuator comprising a transceiver unit for a bus system, the bus terminal of which has a monostable behaviour with an active period of more than 1 millisecond, wherein the transceiver unit is controlled by a microcontroller, wherein the monostable behaviour of the bus terminal is switched off by additional control pulses, wherein the time interval between two control pulses is smaller than the monostable active period of the transceiver unit characterized in that the control pulses are formed by temporal combination of two control signals, whose time resolutions are lower than the pulse duration of the control pulses derived therefrom, wherein the time resolution is the smallest time step width of the corresponding output signal which is achievable with the microcontroller in a respectively used hardware and software configuration.
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Abstract
The present invention provides an electronic circuit for controlling an actuator comprising a transceiver unit (1) for a bus system the bus terminal (2) of which has a monostable behaviour with an active period of greater than 1 ms, wherein the transceiver unit (1) is controlled by a microcontroller (3), wherein the monostable behaviour of the transceiver unit (1) is switched off with additionally superimposed control pulses, wherein the time interval between two control pulses is smaller than the monostable active period of the transceiver unit (1) and the control pulses are generated by temporal combination of two control signals the time resolution of which is lower than the pulse duration of the control pulses derived therefrom, which is implemented by use of a RC combination (4) and/or a logic gate (6) with a differentiating or delaying effect.
13 Citations
10 Claims
- 1. Electronic circuit for controlling an actuator comprising a transceiver unit for a bus system, the bus terminal of which has a monostable behaviour with an active period of more than 1 millisecond, wherein the transceiver unit is controlled by a microcontroller, wherein the monostable behaviour of the bus terminal is switched off by additional control pulses, wherein the time interval between two control pulses is smaller than the monostable active period of the transceiver unit characterized in that the control pulses are formed by temporal combination of two control signals, whose time resolutions are lower than the pulse duration of the control pulses derived therefrom, wherein the time resolution is the smallest time step width of the corresponding output signal which is achievable with the microcontroller in a respectively used hardware and software configuration.
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9. Actuator in a motor vehicle, in particular for actuating a tailgate which in-cludes an electronic circuit comprising a transceiver unit for a bus system, the bus terminal of which has a monostable behaviour with an active period of more than 1 millisecond, wherein the transceiver unit is controlled by a microcontroller, wherein the monostable behaviour of the bus terminal is switched off by additional control pulses, wherein the time interval between two control pulses is smaller than the monostable active period of the transceiver unit characterized in that the control pulses are formed by temporal combination of two control signals, whose time resolutions are lower than the pulse duration of the control pulses derived therefrom, wherein the time resolution is the smallest time step width of the corresponding output signal which is achievable with the microcontroller in a respectively used hardware and software configuration.
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10. Sensor for a motor vehicle comprising a sensor element for detecting a physical measured variable and for converting it into an electrical signal comprising a microcontroller which is supplied with the electrical signal and which depending on the value of the physical measured variable generates binary state information which is intended for a control unit in the vehicle, wherein the state information is forwarded to the control device via a bus module, wherein the bus module serves for adaptation to the physical trans-mission layer of a bus system and comprises a timeout with a hardware-related timeout period which prevents that the bus module outputs a continuous signal which disturbs the communication on the bus, characterized in that the microcontroller and the bus module are connected to each other via a reset pulse generator unit, which on the microcontroller side comprises two inputs and on the bus module side comprises an output, wherein by means of the reset pulse generator unit reset pulses can be generated which are temporally so short, that they are on the one hand not transmitted from the bus module and on the other hand respectively restart the timeout process, such that at the output of the bus module a continuous signal can be generated which is longer than the timeout period.
Specification