Systems for controlling trailer brake output circuits and systems for monitoring manual trailer brake activation slider circuits

• US 9,663,079 B2
• Filed: 01/08/2015
• Issued: 05/30/2017
• Est. Priority Date: 12/02/2014
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Yamamoto, Hidehiro
• Primary Examiner(s): Dager, Jonathan M
• Application Number:
  US14/592,240
• Publication Number:
  US 20160152217A1
• Time in Patent Office: 873 Days
• Field of Search: None
• CPC Class Codes: B60T 7/085 by electrical means, e.g. travel, force sensors
• CPC Class Codes: B60T 7/20 specially for trailers, e.g. in case of uncoupling of or overrunning by trailer inertia-actuated overrun brakes B60T13/08
• CPC Class Codes: B60T 8/1708 for lorries or tractor-trailer combinations

Abstract

Systems for controlling trailer brake output circuits and systems for monitoring manual trailer brake activation slider circuits are provided. A system for controlling a trailer brake output circuit includes a trailer brake output circuit and a manual trailer brake activation slider circuit. The manual trailer brake activation slider circuit includes at least one potentiometer that outputs a potentiometer output signal having a voltage that ranges between a minimum output voltage and a maximum output voltage. The system compares the voltage of the potentiometer output signal to a threshold voltage that is greater than the minimum output voltage of the potentiometer output signal and less than the maximum output voltage of the potentiometer output signal, and controls the trailer brake output circuit based on the comparison of the voltage of the potentiometer output signal to the threshold voltage.

Claims

1. A system for controlling a trailer brake output circuit comprising:

one or more processors;

one or more memory modules communicatively coupled to the one or more processors;

the trailer brake output circuit communicatively coupled to the one or more processors, wherein the trailer brake output circuit outputs a trailer brake output signal;

a manual trailer brake activation slider circuit communicatively coupled to the one or more processors, the manual trailer brake activation slider circuit comprising at least one potentiometer that outputs a potentiometer output signal having a voltage that ranges between a minimum output voltage and a maximum output voltage;

machine readable instructions stored in the one or more memory modules that cause the system to perform at least the following when executed by the one or more processors;

compare the voltage of the potentiometer output signal to a threshold voltage, wherein the threshold voltage is greater than the minimum output voltage of the potentiometer output signal and less than the maximum output voltage of the potentiometer output signal; and

control the trailer brake output circuit based on the comparison of the voltage of the potentiometer output signal to the threshold voltage.

2. The system of claim 1, wherein the trailer brake output circuit outputs the trailer brake output signal in response to a pulse-width modulated trailer brake output command signal having a duty cycle, wherein the machine readable instructions stored in the one or more memory modules cause the system to perform at least the following when executed by the one or more processors:

provide the pulse-width modulated trailer brake output command signal to the trailer brake output circuit, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is based on the comparison of the voltage of the potentiometer output signal to the threshold voltage; and

output the trailer brake output signal based on the pulse-width modulated trailer brake output command signal.

3. The system of claim 2, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is constant when the voltage of the potentiometer output signal is less than the threshold voltage.

4. The system of claim 2, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is constant when the voltage of the potentiometer output signal is greater than the threshold voltage.

5. The system of claim 2, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is proportional to the voltage of the potentiometer output signal when the voltage of the potentiometer output signal is less than the threshold voltage.

6. The system of claim 2, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is proportional to the voltage of the potentiometer output signal when the voltage of the potentiometer output signal is greater than the threshold voltage.

7. The system of claim 2, wherein the machine readable instructions stored in the one or more memory modules cause the system to perform at least the following when executed by the one or more processors:

compare the voltage of the potentiometer output signal to a lower threshold voltage, wherein the lower threshold voltage is greater than the minimum output voltage of the potentiometer output signal; and

compare the voltage of the potentiometer output signal to an upper threshold voltage, wherein the upper threshold voltage is greater than the lower threshold voltage and less than the maximum output voltage of the potentiometer output signal, wherein;

the duty cycle of the pulse-width modulated trailer brake output command signal is a first constant when the voltage of the potentiometer output signal is less than the lower threshold voltage;

the duty cycle of the pulse-width modulated trailer brake output command signal is proportional to the voltage of the potentiometer output signal when the voltage of the potentiometer output signal is greater than the lower threshold voltage and less than the upper threshold voltage; and

the duty cycle of the pulse-width modulated trailer brake output command signal is a second constant when the voltage of the potentiometer output signal is greater than the upper threshold voltage.

8. The system of claim 7, wherein the first constant is 0% and the second constant is 100%.

9. A system for monitoring a manual trailer brake activation slider circuit comprising:

one or more processors;

one or more memory modules communicatively coupled to the one or more processors;

the manual trailer brake activation slider circuit communicatively coupled to the one or more processors, the manual trailer brake activation slider circuit comprising at least one potentiometer that outputs a potentiometer output signal having a voltage that ranges between a minimum output voltage and a maximum output voltage;

machine readable instructions stored in the one or more memory modules that cause the system to perform at least the following when executed by the one or more processors;

compare the voltage of the potentiometer output signal to a threshold voltage, wherein the threshold voltage is greater than the minimum output voltage of the potentiometer output signal and less than the maximum output voltage of the potentiometer output signal; and

monitor the manual trailer brake activation slider circuit for a malfunction condition based on the comparison of the voltage of the potentiometer output signal to the threshold voltage.

10. The system of claim 9, wherein the machine readable instructions stored in the one or more memory modules cause the system to perform at least the following when executed by the one or more processors:

compare the voltage of the potentiometer output signal to a lower threshold voltage, wherein the lower threshold voltage is greater than the minimum output voltage of the potentiometer output signal;

compare the voltage of the potentiometer output signal to an upper threshold voltage, wherein the upper threshold voltage is greater than the lower threshold voltage and less than the maximum output voltage of the potentiometer output signal; and

monitor the manual trailer brake activation slider circuit for the malfunction condition when the voltage of the potentiometer output signal is greater than the lower threshold voltage and less than the upper threshold voltage.

11. The system of claim 10, wherein the machine readable instructions stored in the one or more memory modules cause the system to perform at least the following when executed by the one or more processors:

determine that a short circuit malfunction condition exists when the voltage of the potentiometer output signal is greater than or less than a short circuit malfunction threshold voltage.

12. The system of claim 10, wherein the at least one potentiometer includes:

a first potentiometer that outputs a first potentiometer output signal having a voltage that ranges between a first minimum output voltage and a first maximum output voltage; and

a second potentiometer that outputs a second potentiometer output signal having a voltage that ranges between a second minimum output voltage and a second maximum output voltage, wherein the machine readable instructions stored in the one or more memory modules cause the system to perform at least the following when executed by the one or more processors;

determine that a comparison failure malfunction condition exists based on the voltage of the first potentiometer output signal and the voltage of the second potentiometer output signal.

13. A system for controlling a trailer brake output circuit comprising:

one or more processors;

one or more memory modules communicatively coupled to the one or more processors;

the trailer brake output circuit communicatively coupled to the one or more processors, wherein the trailer brake output circuit outputs a trailer brake output signal;

a manual trailer brake activation slider circuit communicatively coupled to the one or more processors, the manual trailer brake activation slider circuit comprising;

a first potentiometer that outputs a first potentiometer output signal having a voltage that ranges between a first minimum output voltage and a first maximum output voltage; and

a second potentiometer that outputs a second potentiometer output signal having a voltage that ranges between a second minimum output voltage and a second maximum output voltage; and

machine readable instructions stored in the one or more memory modules that cause the system to perform at least the following when executed by the one or more processors;

compare the voltage of the first potentiometer output signal to a lower threshold voltage, wherein the lower threshold voltage is greater than the first minimum output voltage;

compare the voltage of the first potentiometer output signal to an upper threshold voltage, wherein the upper threshold voltage is greater than the lower threshold voltage and less than the first maximum output voltage;

compare the voltage of the first potentiometer output signal to the voltage of the second potentiometer output signal; and

control the trailer brake output circuit based on the comparison of the voltage of the first potentiometer output signal to the lower threshold voltage, the comparison of the first potentiometer output signal to the upper threshold voltage, and the comparison of the voltage of the first potentiometer output signal to the voltage of the second potentiometer output signal.

14. The system of claim 13, wherein the trailer brake output circuit outputs the trailer brake output signal in response to a pulse-width modulated trailer brake output command signal having a duty cycle, wherein the machine readable instructions stored in the one or more memory modules cause the system to perform at least the following when executed by the one or more processors:

provide the pulse-width modulated trailer brake output command signal to the trailer brake output circuit, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is based on the comparison of the voltage of the first potentiometer output signal to the lower threshold voltage, the comparison of the first potentiometer output signal to the upper threshold voltage, and the comparison of the voltage of the first potentiometer output signal to the voltage of the second potentiometer output signal; and

output the trailer brake output signal based on the pulse-width modulated trailer brake output command signal.

15. The system of claim 14, wherein the machine readable instructions stored in the one or more memory modules cause the system to perform at least the following when executed by the one or more processors:

determine whether the first potentiometer output signal and the second potentiometer output signal are valid based on the comparison of the voltage of the first potentiometer output signal to the voltage of the second potentiometer output signal; and

control the trailer brake output circuit based on whether the first potentiometer output signal and the second potentiometer output signal are determined to be valid.

16. The system of claim 15, wherein the machine readable instructions stored in the one or more memory modules cause the system to perform at least the following when executed by the one or more processors:

determine a composite potentiometer output signal based on the voltage of the first potentiometer output signal and the voltage of the second potentiometer output signal, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is proportional to the composite potentiometer output signal when;

(i) the voltage of the first potentiometer output signal is greater than the lower threshold voltage and less than the upper threshold voltage; and

(ii) the first potentiometer output signal and the second potentiometer output signal are determined to be valid.

17. The system of claim 15, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is a first constant when:

(i) the voltage of the first potentiometer output signal is less than the lower threshold voltage; and

(ii) the first potentiometer output signal and the second potentiometer output signal are determined to be valid.

18. The system of claim 15, wherein the duty cycle of the pulse-width modulated trailer brake output command signal is a second constant when:

(i) the voltage of the first potentiometer output signal is greater than the upper threshold voltage; and

(ii) the first potentiometer output signal and the second potentiometer output signal are determined to be valid.

19. The system of claim 15, wherein the duty cycle of the pulse-width modulated trailer brake output command signal remains unchanged when the first potentiometer output signal and the second potentiometer output signal are determined not to be valid.