Retarder integrated braking system and method
First Claim
1. A machine comprising:
- an axle having wheels;
a brake system configured to provide service braking to the wheels;
a brake pedal operatively connected to the brake system to provide a braking power to the wheels in proportion to a position of the brake pedal;
a pedal sensor operatively connected to the brake pedal to sense the position of the brake pedal;
a retarder system configured to selectively slow the wheels down;
a speed sensor operatively connected to the machine to detect a speed associated with the machine; and
a controller operatively connected to the speed sensor, brake pedal position sensor, and the retarder system,wherein the controller is configured to operate the retarder system based on signals received from the speed sensor and brake pedal position sensor, andwherein, when controlling the retarder system, the controller is configured to;
calculate a reference retarding power based on a speed associated with the machine,calculate a percent retarding power based on the reference retarding power and a requested amount of brake power associated with the position of the brake pedal, andengage the retarder system when the percent retarding power is greater than a particular percentage of the reference retarding power for a period of time that is greater than a threshold amount of time,the retarder system being engaged after an amount of the braking power has been applied to the wheels for a particular period of time.
1 Assignment
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Accused Products
Abstract
A machine includes: an axle having wheels mounted to it; a brake system configured to provide service braking to the wheels; a brake pedal operatively connected to the brake system to provide a braking power to the wheels in proportion to the position of the brake pedal; a pedal sensor operatively connected to the brake pedal to sense the position of the brake pedal; a retarder system configured to selectively slow the wheels down; a speed sensor operatively connected to the machine to detect a speed associated with the machine; a controller operatively connected to the speed sensor, brake pedal position sensor, and retarder system wherein the controller is configured to operate the retarder system based on signals received from the speed sensor and brake pedal position sensor. A method for providing an indication to an operator may also be included.
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Citations
18 Claims
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1. A machine comprising:
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an axle having wheels; a brake system configured to provide service braking to the wheels; a brake pedal operatively connected to the brake system to provide a braking power to the wheels in proportion to a position of the brake pedal; a pedal sensor operatively connected to the brake pedal to sense the position of the brake pedal; a retarder system configured to selectively slow the wheels down; a speed sensor operatively connected to the machine to detect a speed associated with the machine; and a controller operatively connected to the speed sensor, brake pedal position sensor, and the retarder system, wherein the controller is configured to operate the retarder system based on signals received from the speed sensor and brake pedal position sensor, and wherein, when controlling the retarder system, the controller is configured to; calculate a reference retarding power based on a speed associated with the machine, calculate a percent retarding power based on the reference retarding power and a requested amount of brake power associated with the position of the brake pedal, and engage the retarder system when the percent retarding power is greater than a particular percentage of the reference retarding power for a period of time that is greater than a threshold amount of time, the retarder system being engaged after an amount of the braking power has been applied to the wheels for a particular period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a retarder system, the method comprising:
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calculating a requested amount of brake power, requested by an operator, based on a sensed pedal position of a service brake pedal; applying a portion of the requested amount of brake power for a first period of time; calculating a reference retarding power based on a speed associated with the drivetrain; calculating a retarding power by multiplying the requested amount of brake power by a percentage; calculating a percent retarding power by dividing the retarding power by the reference retarding power; and engaging a retarder, after applying the portion of the requested amount of brake power for the first period of time, when the percent retarding power is greater than a particular percentage of the reference retarding power for a second period of time that is greater than a threshold amount of time. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification