Cabin pressure control system

A pressure control system for a compartment of a vehicle, the system comprising:

• a primary controller configured to issue a first command and configured to issue a third command;
• a secondary controller configured to issue a second command and configured to issue a fourth command;
• a first valve configured to fluidically couple an internal environment of the compartment and an external environment surrounding the vehicle;
• a first valve control system including a first auto controller and a first auto motor and including a first backup controller and a first backup motor, wherein the first valve control system is configured to operate the first valve by one of providing the first command to the first auto controller to cause the first auto motor to produce a first mechanical power, or providing the second command to the first backup controller to cause the first backup motor to produce a second mechanical power;
• a second valve configured to fluidically couple the compartment and the external environment;
• and
• a second valve control system including a second auto controller and a second auto motor and including a second backup controller and a second backup motor, wherein the second valve control system is configured to operate the second valve by one of providing the third command to the second auto controller to cause the second auto motor to produce a third mechanical power, or providing the fourth command to the second auto controller to cause the second auto motor to produce a fourth mechanical power,
• wherein the first valve control system is configured to provide the second command to the first backup controller and the second valve control system is configured to provide the fourth command to the second auto controller when the primary controller fails to send the first command or fails to send the third command, or when the first command fails cause the operation of the first valve, or when the third command fails to cause the operation of the second valve,
• wherein the first backup controller is configured to issue a first backup command and issue a second backup command when the secondary controller fails to send the second command or fails to send the fourth command, or when the second command fails to cause the operation of the first valve, or when the fourth command fails to cause the operation of the second valve,
• wherein the second backup controller is configured to issue a third backup command and issue a fourth backup command when the first backup controller fails to send the first backup command or fails to send the fourth backup command, or when the first backup command fails to cause the operation of the first valve, or when the second backup command fails to cause the operation of the second valve, and
• wherein the first backup controller is configured to operate the first valve using the first backup command or the third backup command and the second backup controller is configured to operate the second valve using the second backup command or the fourth backup command.

A method, comprising:

• operating, by a first valve control system, a first valve by one of providing a first command issued by a primary controller to a first auto controller or providing a second command issued by a secondary controller to a first backup controller;
• operating, by a second valve control system, a second valve by one of providing a third command issued by the primary controller to a second auto controller or providing a fourth command issued by the secondary controller to a first backup controller,
• wherein the first valve control system provides the second command and the second valve control system provides the fourth command if the primary controller fails to send the first command or fails to send the third command, or if the first command fails cause the operation of the first valve, or if the third command fails to cause the operation of the second valve;
• and
• operating, using the first backup controller, the first valve using a first backup command issued by the first backup controller and the second valve using a second backup command issued by the first backup controller if the secondary controller fails to send the second command or fails to send the fourth command, or if the second command fails to cause the operation of the first valve, or if the fourth command fails to cause the operation of the second valve, wherein the first backup controller is configured to operate the first valve using the first backup command the second backup controller is configured to operate the second valve using the second backup command.