Wake-up circuit
AssigneeTemic Automotive of North America, Inc.
InventorsJohn R. Qualich, Perry A. Emrath
Life of this patent
Estimating the term…
Abstract
The disclosed embodiments may relate to vehicle (10) having a control system (12) located within the vehicle (10). The control system (12) may include a processor (26) and a wake-up circuit (46) coupled to the processor (26). The processor (26) may utilize a program (34) during a standby mode of operation. The program (34) is configured to provide a voltage to the wake-up circuit (46) for a first time period (T1) once an interrupt is received by the processor (26). Then, the program (34) may monitor the wake-up circuit (46) for a second time period (T2). If a response of the wake-up circuit (46) exceeds at least one of a plurality of predetermined limits, then the program (34) may recalibrate the wake-up circuit (46).
Claims32
An apparatus, comprising:
- a vehicle;
- and
- a control system located in the vehicle, the control system comprising:
- a processor,
- a wake-up circuit coupled to the processor;
- a program utilized by the processor during a standby mode of operation, the program configured to:
- provide a voltage to the wake-up circuit for a first time period once an interrupt is received by the processor;
- monitor the wake-up circuit for a second time period;
- and
- recalibrate the voltage to the wake-up circuit if a response of the wake-up circuit exceeds at least one predetermined limit.
An automotive control system, comprising:
- a microprocessor,
- a wake-up circuit coupled to the microprocessor;
- a memory coupled to the microprocessor;
- a program within the memory and utilized by the microprocessor, the program configured to:
- apply a voltage to the wake-up circuit for a first time period;
- measure a response of the wake-up circuit for a second time period;
- determine if the response is within a predetermined limit;
- and
- recalibrate the voltage if the response is not within the predetermined limit.
One or more tangible computer readable mediums encoded with a computer program for operating and recalibrating a wake-up circuit, the program comprising:
- a routine for applying a voltage to a wake-up circuit for a first time period in response to an interrupt;
- a routine for measuring a response of the wake-up circuit for a second time period;
- a routine for determining if the response is within a predetermined limit;
- and
- a routine for recalibrating the voltage if the response is not within the predetermined limit.
A method of monitoring a control system, the method comprising the acts of:
- providing an interrupt signal to a microprocessor;
- measuring a first voltage on a port of the microprocessor connected to a wake-up circuit;
- generating an output voltage for a time period on the port;
- measuring a second voltage on the port once the output voltage generation stops;
- comparing the first voltage and second voltage to at least one stored parameter;
- determining if the comparison is within or equal to a predetermined limit;
- and
- recalibrating at least one of the output voltage and time period, if the comparison exceeds the predetermined limit.
A method of manufacturing a control system comprising the acts of:
- providing a processor;
- coupling a wake-up circuit to the processor;
- encoding an program to:
- provide a voltage to the wake-up circuit for a first time period if a standby mode is indicated;
- stop providing the voltage at the end of the first time period;
- monitor a response of the wake-up circuit for a second time period;
- and
- recalibrate the voltage if the response exceeds at least one of a plurality of predetermined limitations.
A method of monitoring a control system, the method comprising the acts of:
- providing an interrupt signal to a microprocessor;
- operating the microprocessor to detect a state change for a control system when the interrupt is provided;
- determining whether a threshold event has occurred;
- recalibrating an output voltage associated with a wake-up circuit, so that the output voltage is within a predetermined limit, if the threshold event has occurred;
- and
- waiting for another interrupt to be provided to the microprocessor, if the threshold event has not occurred.
Dependencies are inferred from the claim text.