System and method for preventing vehicle roll-away

An article of manufacture, comprising:

• a non-transitory computer storage medium having a computer program encoded thereon that when executed by a parking brake controller controls a parking brake for a wheel of a vehicle, the computer program including code for, when an operator interface of the vehicle configured to transmit a brake command signal in response to actuation of the operator interface by an operator of the vehicle is not actuated by the operator and does not transmit the brake command signal,
• determining that the vehicle is in an inactive state if both of a first signal generated from a first source and a second signal generated from a second source, different from the first source, indicate the vehicle is the inactive state, the first signal and the second signal independent of a presence or absence of the operator of the vehicle;
• determining, responsive to a third signal indicative of a speed of the vehicle, whether the speed of the vehicle meets a predetermined condition relative to a predetermined speed of the vehicle;
• and,
• generating a control signal configured to apply the parking brake after determining that the vehicle is the inactive state and determining that the speed of the vehicle meets the predetermined condition relative to the predetermined speed.

A method for braking a vehicle when an operator interface of the vehicle configured to transmit a brake command signal in response to actuation of the operator interface by an operator of the vehicle is not actuated by the operator and does not transmit the brake command signal, comprising:

• receiving a first signal indicative of whether the vehicle is in an active state or an inactive state from a first source, the first signal independent of a presence or absence of the operator of the vehicle;
• receiving a second signal indicative of whether the vehicle is in the active state or the inactive state from a second source, different from the first source, the second signal independent of the presence or absence of the operator of the vehicle;
• determining that the vehicle is in the inactive state if both of the first and second signals indicate the vehicle is the inactive state;
• receiving a third signal indicative of a speed of the vehicle;
• and,
• determining, responsive to the third signal, whether the speed of the vehicle meets a predetermined condition relative to a predetermined speed of the vehicle;
• and,
• generating a control signal configured to apply a parking brake for a wheel of the vehicle after determining that the vehicle is the inactive state and determining that the speed of the vehicle meets the predetermined condition relative to the predetermined speed.