Anti-lock braking system capable of recording the operating conditions of elements thereof and recording method therefor
First Claim
1. An anti-lock braking system capable of recording operating conditions of elements thereof, comprising:
- a wheel speed sensor attached to a wheel of a vehicle for sensing a wheel speed and generating a wheel speed signal;
an ABS ECU connected to the wheel speed sensor so as to receive the wheel speed signal from the wheel speed sensor, the ABS ECU calculating a slip rate based on the wheel speed signal and generating electric signals for controlling fluid pressure applied to the wheel when the slip rate exceeds a predetermined normal value;
a motor section, which is driven as the electric signal is input thereto by the ABS ECU;
a pump section for increasing pressure of fluid, the pump section being operated by the motor section;
a fluid pressure adjusting section for adjusting the fluid pressure applied to the wheel by intermittently transferring pressurized fluid to the wheel according to the electric signal from the ABS ECU; and
a microcomputer for recording the operating conditions of the wheel speed sensor, the ABS ECU, the motor section, the pump section, and the fluid pressure adjusting section, respectively,wherein the microcomputer includes a first memory means comprising a random access memory for recording the operating conditions of the wheel speed sensor, the ABS ECU, the motor section, the pump section, and the fluid pressure adjusting section, respectively, and a second memory means comprised of an electrically erasable and programmable read only memory for storing data recorded in the first memory means,wherein the microcomputer is connected to an engine ECU to determine whether the engine ECU has been turned on or not, the microcomputer generating a reset signal for resetting the records stored in the second memory means when the engine ECU is turned on,wherein the microcomputer is connected to the ABS ECU to receive wheel-sliP rate data and the electric signals applied to both the motor section and the fluid pressure adjusting section from the ABS ECU, the microcomputer storing the data in the first memory means into the second memory means when the wheel-slip rate exceeds the predetermined normal value.
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Accused Products
Abstract
An anti-lock braking system as well as the method thereof, is capable of recording the operating conditions of elements thereof. The anti-lock braking system includes a microcomputer having first and second memories. The method includes a step for resetting data stored in the second memory. A slip rate of a wheel, electric signals applied to both motor and a solenoid valve assembly, an output voltage and a RPM of the motor, an output pressure of a pump, and a pressure of a fluid passing through the solenoid valve assembly are permanetly recorded in the second memory. By using the anti-lock braking system, the user can easily find a malfunctioned element of the anti-lock braking system and can save the time and money normally used in checking the anti-lock braking system when the anti-lock braking system malfuntions.
28 Citations
7 Claims
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1. An anti-lock braking system capable of recording operating conditions of elements thereof, comprising:
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a wheel speed sensor attached to a wheel of a vehicle for sensing a wheel speed and generating a wheel speed signal; an ABS ECU connected to the wheel speed sensor so as to receive the wheel speed signal from the wheel speed sensor, the ABS ECU calculating a slip rate based on the wheel speed signal and generating electric signals for controlling fluid pressure applied to the wheel when the slip rate exceeds a predetermined normal value; a motor section, which is driven as the electric signal is input thereto by the ABS ECU; a pump section for increasing pressure of fluid, the pump section being operated by the motor section; a fluid pressure adjusting section for adjusting the fluid pressure applied to the wheel by intermittently transferring pressurized fluid to the wheel according to the electric signal from the ABS ECU; and a microcomputer for recording the operating conditions of the wheel speed sensor, the ABS ECU, the motor section, the pump section, and the fluid pressure adjusting section, respectively, wherein the microcomputer includes a first memory means comprising a random access memory for recording the operating conditions of the wheel speed sensor, the ABS ECU, the motor section, the pump section, and the fluid pressure adjusting section, respectively, and a second memory means comprised of an electrically erasable and programmable read only memory for storing data recorded in the first memory means, wherein the microcomputer is connected to an engine ECU to determine whether the engine ECU has been turned on or not, the microcomputer generating a reset signal for resetting the records stored in the second memory means when the engine ECU is turned on, wherein the microcomputer is connected to the ABS ECU to receive wheel-sliP rate data and the electric signals applied to both the motor section and the fluid pressure adjusting section from the ABS ECU, the microcomputer storing the data in the first memory means into the second memory means when the wheel-slip rate exceeds the predetermined normal value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An anti-lock braking system capable of recording operating conditions of elements thereof, comprising:
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a wheel speed sensor attached to a wheel of a vehicle for sensing a wheel speed and generating a wheel speed signal; an ABS ECU connected to the wheel speed sensor so as to receive the wheel speed signal from the wheel speed sensor, the ABS ECU calculating a slip rate based on the wheel speed signal and generating electric signals for controlling fluid pressure applied to the wheel when the slip rate exceeds a predetermined normal value; a motor section, which is driven as the electric signal is input from the ABS ECU, the motor section including a motor driver connected to the ABS ECU so as to receive the electric signal from the ABS ECU, a motor connected to the motor driver and driven as the electric signal is input to the motor driver, a voltage sensor for sensing an output voltage of the motor driver, and an RPM sensor for sensing RPM of the motor; a pump section for increasing pressure of fluid, the pump section including a pump operated by the motor and a pressure transducer for sensing the pressure of the fluid at an outlet of the pump; a fluid pressure adjusting section for adjusting the fluid pressure applied to the wheel by intermittently transferring a pressurized fluid to the wheel according to the electric signal from the ABS ECU, the fluid pressure adjusting section including a solenoid valve assembly connected to the ABS ECU and a pressure sensor for sensing the pressure of the fluid passing through the solenoid valve assembly, the solenoid valve assembly including a solenoid for receiving an intermittent electric signal from the ABS ECU, first and second piston valves, which move forward and backward as the intermittent electric signal is applied to the solenoid, and a spring disposed between the first and second piston valves; and a microcomputer having a random access memory for recording the operating conditions of the wheel speed sensor, of the ABS ECU, of the motor section, of the pump section, and of the fluid pressure adjusting section respectively, and an electrically erasable and programmable read only memory for storing data recorded in the random access memory, wherein the microcomputer is connected to; an engine ECU to determine whether the engine ECU has been turned on or not, the microcomputer generating a reset signal for resetting the data stored in the electrically erasable and programmable memory when the engine ECU is turned on, the ABS ECU to receive and record data regarding the slip rate of the wheel and the electric signals applied to both the motor section and the fluid pressure adjusting section from the ABS ECU, the pressure sensor of the fluid pressure adjusting section to record the pressure of the fluid to the random access memory, the voltage sensor of the motor section to record voltage data to the random access memory, the RPM sensor of the motor section record RPM data to the random access memory, and the pressure transducer to record pump pressure data to the random access memory, wherein the microcomputer stores the data in the first memory means into the second memory means when the slip rate exceeds the predetermined normal value.
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Specification