Vehicular air supply system

1. A vehicular air supply system comprising:

a first air operation mechanism which is operated at an air pressure of a first pressure value or less;

a second air operation mechanism which is operated at an air pressure of a second pressure value or less, the second pressure value being lower than the first pressure value;

a compressed air generator which generates compressed air to be supplied to the first air operation mechanism and the second air operation mechanism;

a first discharge air supply unit which supplies air discharged from the first air operation mechanism to the second air operation mechanism when a pressure value of the air discharged from the first air operation mechanism is higher than a pressure value of the air supplied from the compressed air generator to the second air operation mechanism;

an air tank which stores the air generated by the compressed air generator at the second pressure value or less and supplies the stored air to the second air operation mechanism,

wherein the first discharge air supply unit supplies the air discharged from the first air operation mechanism to the air tank when a differential pressure between the pressure value of the air discharged from the first air operation mechanism and a pressure value of the air inside the air tank is a predetermined differential pressure value or more,

wherein the first discharge air supply unit includes

a first sensor which detects the pressure value of the air discharged from the first air operation mechanism,

a second sensor which detects the pressure value inside the air tank,

a switching member which is able to switch an operation in which the air discharged from the first air operation mechanism is supplied to the air tank and an operation in which the air discharged from the first air operation mechanism is supplied to a portion other than the second air operation mechanism, and

a control unit which controls the switching member so that the air discharged from the first air operation mechanism is supplied to the air tank when the differential pressure between the pressure value detected by the first sensor and the pressure value detected by the second sensor is the predetermined differential pressure value or more and controls the switching member so that the air discharged from the first air operation mechanism is supplied to a portion other than the second air operation mechanism when the differential pressure between the pressure value detected by the first sensor and the pressure value detected by the second sensor is not the predetermined differential pressure value or more.

2. The vehicular air supply system according to claim 1 ,

wherein the first discharge air supply unit discharges the air discharged from the first air operation mechanism to an atmosphere other than the second air operation mechanism.

3. The vehicular air supply system according to claim 1 ,

wherein the first discharge air supply unit supplies the air discharged from the first air operation mechanism to the air tank when the pressure value inside the air tank is a predetermined residual pressure value or less.

4. The vehicular air supply system according to claim 1 ,

wherein at least one of the first air operation mechanism and the second air operation mechanism is any one of a brake mechanism, an air suspension mechanism, and a transmission mechanism shifting gears by an air pressure.

5. A vehicular air supply system comprising:

a first air operation mechanism which is operated at an air pressure of a first pressure value or less;

a second air operation mechanism which is operated at an air pressure of a second pressure value or less, the second pressure value being lower than the first pressure value;

a compressed air generator which generates compressed air to be supplied to the first air operation mechanism and the second air operation mechanism;

a first discharge air supply unit which supplies air discharged from the first air operation mechanism to the second air operation mechanism when a pressure value of the air discharged from the first air operation mechanism is higher than a pressure value of the air supplied from the compressed air generator to the second air operation mechanism;

an air tank which stores the air generated by the compressed air generator at the second pressure value or less and supplies the stored air to the second air operation mechanism,

wherein the first discharge air supply unit supplies the air discharged from the first air operation mechanism to the air tank when a differential pressure between the pressure value of the air discharged from the first air operation mechanism and a pressure value of the air inside the air tank is a predetermined differential pressure value or more, and

wherein the first discharge air supply unit includes a differential pressure valve which supplies the air discharged from the first air operation mechanism to the air tank when the differential pressure between the pressure value of the air discharged from the first air operation mechanism and the pressure value of the air inside the air tank is the predetermined differential pressure value or more and supplies the air discharged from the first air operation mechanism to a portion other than the second air operation mechanism when the differential pressure between the pressure value of the air discharged from the first air operation mechanism and the pressure value of the air inside the air tank is not the predetermined pressure value or more.

6. The vehicular air supply system according to claim 5 ,

wherein the first discharge air supply unit discharges the air discharged from the first air operation mechanism to an atmosphere other than the second air operation mechanism.

7. The vehicular air supply system according to claim 5 ,

wherein the first discharge air supply unit supplies the air discharged from the first air operation mechanism to the air tank when the pressure value inside the air tank is a predetermined residual pressure value or less.

8. The vehicular air supply system according to claim 5 ,

wherein at least one of the first air operation mechanism and the second air operation mechanism is any one of a brake mechanism, an air suspension mechanism, and a transmission mechanism shifting gears by an air pressure.

9. A vehicular air supply system comprising:

a first air operation mechanism which is operated at an air pressure of a first pressure value or less;

a second air operation mechanism which is operated at an air pressure of a second pressure value or less, the second pressure value being lower than the first pressure value;

a compressed air generator which generates compressed air to be supplied to the first air operation mechanism and the second air operation mechanism;

a first discharge air supply unit which supplies air discharged from the first air operation mechanism to the second air operation mechanism when a pressure value of the air discharged from the first air operation mechanism is higher than a pressure value of the air supplied from the compressed air generator to the second air operation mechanism;

a third air operation mechanism which is operated at an air pressure of a third pressure value or less, the third pressure value being lower than the second pressure value; and

a second discharge air supply unit which supplies air discharged from the second air operation mechanism to the third air operation mechanism when a pressure value of the air discharged from the second air operation mechanism is higher than a pressure value of air supplied from the compressed air generator to the third air operation mechanism,

wherein the compressed air generated by the compressed air generator is further supplied to the third air operation mechanism.