Wired braking module, wired braking system, and control method for the same

A wired braking system comprising:

• a wired braking module, which comprises:
• a drive motor;
• a first electronic control unit communicatively connected to the drive motor;
• a main push rod drivingly connected to the drive motor;
• a master brake cylinder comprising:
• a main piston;
• an auxiliary piston, the main piston and the auxiliary piston dividing the master brake cylinder into a first chamber and a second chamber;
• a first return spring arranged between the main piston and the auxiliary piston;
• and
• a second return spring arranged between the auxiliary piston and an end wall of the master brake cylinder, wherein, in an initial position, the main piston is in contact with the main push rod and the first chamber and the second chamber
• are respectively in communication with a reservoir;
• and
• a vehicle body electronic stability module comprising:
• a first passage fluidly connecting the first chamber to a first sub-brake cylinder and to a second sub-brake cylinder;
• a second passage fluidly connecting the second chamber to a third sub-brake cylinder and a fourth sub-brake cylinder;
• a first main valve disposed on the first passage;
• a second main valve disposed on the second passage;
• a second electronic control unit communicatively connected to the first main valve and the second main valve;
• and
• a pressure sensor monitoring the brake fluid pressure on a side of the main brake cylinder of the first main valve of the first passage or the second main valve of the second passage,
• wherein the first electronic control unit and the second electronic control unit are communicatively connected and are configured to:
• upon receiving a braking request from an electronic brake pedal, drive the main piston forward to compress brake fluid in the master brake cylinder into the first, second, third, and fourth sub-brake cylinders, thereby establishing brake fluid pressure;
• estimate whether a current forward stroke of the main piston can satisfy the braking request;
• when a result of the estimation is affirmative, executing the current forward stroke until the braking request is satisfied, and
• when the result of the estimation is negative:
• execute the current forward stroke until the stroke of the main piston reaches a first threshold, then cutting off communication between the master brake cylinder and each of the sub-brake cylinders;
• retract the main piston until the master brake cylinder communicates with a reservoir, allowing brake fluid from the reservoir to replenish the master brake cylinder;
• advance the main piston again and re-establishing communication between the master brake cylinder and each of the sub-brake cylinders to further increase the brake fluid pressure in each of the sub-brake cylinders;
• and
• return to the estimating of whether the current forward stroke can satisfy the braking request.

A wired braking module, comprising:

• a drive motor;
• a first electronic control unit communicatively connected to the drive motor;
• a main push rod drivingly connected to the drive motor;
• a master brake cylinder comprising:
• a main piston;
• an auxiliary piston, the main piston and the auxiliary piston dividing the master brake cylinder into a first chamber and a second chamber;
• a first return spring arranged between the main piston and the auxiliary piston;
• and
• a second return spring arranged between the auxiliary piston and an end wall of the master brake cylinder, wherein, in an initial position, the main piston is in contact with the main push rod and the first chamber and the second chamber are respectively in communication with a reservoir;
• and
• wherein, upon receiving a braking request from an electronic brake pedal, the first electronic control unit is configured to:
• control the drive motor to drive the main piston in the master brake cylinder forward to compress brake fluid in the master brake cylinder;
• estimate whether a current forward stroke of the main piston can satisfy the braking request;
• when a result of the estimation is affirmative, executing the current forward stroke until the braking request is satisfied, and
• when the result of the estimation is negative:
• execute the current forward stroke until the stroke of the main piston exceeds a predetermined threshold, then send a first signal to a vehicle body electronic stability module to notify the vehicle body electronic stability module to disconnect the master brake cylinder from each of a plurality of sub-brake cylinders;
• retract the main piston until the master brake cylinder communicates with the reservoir, allowing brake fluid from the reservoir to replenish the master brake cylinder;
• and
• advance the main piston again and sending a second signal to the vehicle body electronic stability module to notify the vehicle body electronic stability module to reconnect of the master brake cylinder with each of the plurality of sub-brake cylinders.