Trailer brake control module

A trailer brake control module (300a;

• 300b;
• 300c) for a towing vehicle (502) facilitating braking of a towed vehicle or trailer (504), comprising:
• a pressure supply port (P11);
• a trailer control pressure port (P22);
• a primary control port (P42) for receiving either directly or indirectly a control brake pressure for operating the trailer brake control module (300a;
• 300b;
• 300c), wherein the primary control port (P42) receives the control brake pressure from a pneumatically operated supply of pressure medium;
• a pneumatic control pressure line (308.1) providing alternative control brake pressure for operating the trailer brake control module (300a;
• 300b;
• 300c), wherein the pneumatic control pressure line (308.1) receives the alternative control brake pressure from an electronically operated supply of pressure medium;
• and
• a relay valve (310;
• 516) that is activated using either:
• the control brake pressure received at the primary control port (P42), or
• the alternative control brake pressure from the pneumatic control pressure line (308.1),
• wherein on activating the relay valve (310), the pneumatic pressure received at the pressure supply port (P11) is connected to the trailer control pressure port (P22),
• wherein the trailer brake control module (300a;
• 300b;
• 300c) is additionally provided with a braking rate rebalancing unit that maintains the difference of the braking rate between said towing vehicle and said trailer within a permissible threshold range;
• wherein the braking rate rebalancing unit includes a mechanically operated sub-unit (314 or PRV) that is either coaxially positioned in relation to a central axis (Y-Y′) of the trailer brake control module (300a;
• 300b;
• 300c) or is positioned perpendicular to said central axis (Y-Y′), wherein said mechanically operated sub-unit (314 or PRV) is at least vertically above the relay valve (310;
• 516).

A trailer brake control module (300a;

• 300b;
• 300c) for a towing vehicle (502) facilitating braking of a towed vehicle or trailer (504), comprising:
• a pressure supply port (P11);
• a trailer control pressure port (P22);
• a primary control port (P42) for receiving either directly or indirectly a control brake pressure for operating the trailer brake control module (300a;
• 300b;
• 300c), wherein the primary control port (P42) receives the control brake pressure from a pneumatically operated supply of pressure medium:
• a pneumatic control pressure line (308.1) providing alternative control brake pressure for operating the trailer brake control module (300a;
• 300b;
• 300c), wherein the pneumatic control pressure line (308.1) receives the alternative control brake pressure from an electronically operated supply of pressure medium;
• and
• a relay valve (310;
• 516) that is activated using either:
• the control brake pressure received at the primary control port (P42), or
• the alternative control brake pressure from the pneumatic control pressure line (308.1),
• wherein on activating the relay valve (310), the pneumatic pressure received at the pressure supply port (P11) is connected to the trailer control pressure port (P22),
• wherein the trailer brake control module (300a;
• 300b;
• 300c) is additionally provided with a braking rate rebalancing unit that maintains the difference of the braking rate between said towing vehicle and said trailer within a permissible threshold range;
• wherein the pressure at the trailer brake control port (P22) is measured using a Pulse Width Modulation (PWM) based pressure sensor.

A trailer brake control module (300a;

• 300b;
• 300c) for a towing vehicle (502) facilitating braking of a towed vehicle or trailer (504), comprising:
• a pressure supply port (P11);
• a trailer control pressure port (P22);
• a primary control port (P42) for receiving either directly or indirectly a control brake pressure for operating the trailer brake control module (300a;
• 300b;
• 300c), wherein the primary control port (P42) receives the control brake pressure from a pneumatically operated supply of pressure medium;
• a pneumatic control pressure line (308.1) providing alternative control brake pressure for operating the trailer brake control module (300a;
• 300b;
• 300c), wherein the pneumatic control pressure line (308.1) receives the alternative control brake pressure from an electronically operated supply of pressure medium;
• and
• a relay valve (310;
• 516) that is activated using either:
• the control brake pressure received at the primary control port (P42), or
• the alternative control brake pressure from the pneumatic control pressure line (308.1),
• wherein on activating the relay valve (310), the pneumatic pressure received at the pressure supply port (P11) is connected to the trailer control pressure port (P22),
• wherein the trailer brake control module (300a;
• 300b;
• 300c) is additionally provided with a braking rate rebalancing unit that maintains the difference of the braking rate between said towing vehicle and said trailer within a permissible threshold range;
• wherein trailer brake control module (300a;
• 300b;
• 300c) further comprises a first pneumatic control chamber (402) to which the primary control port (P42) is connected.