Device for changing the gears automatically on a synchronized gearbox

A processing device for automatically controlling changes of speed in a synchronized gearbox associated with a clutch of a vehicle, comprising, in combination:

• a gearbox having change members;
• a gearbox control device (400) operatively connected with and controlling said change members of said gearbox;
• a device (200) for selection of speed ratios;
• a device (500) for detecting the condition of said gearbox;
• a first comparator (302);
• an electronic assembly including logic elements;
• said electronic assembly having an input section which includes said first comparator (302) operably and electrically connected between said speed ratio selection device (200) and said gearbox condition detecting device (500);
• said electronic assembly having its output operably and electrically connected to said gearbox control device (400) for controlling said change members of said gearbox;
• said input section of said electronic assembly also including a memory device (301) for the temporary storage of the code of a selected ratio;
• said memory device (301) being operably and electrically connected between said speed ratio selection device (200) and said first comparator (302);
• said speed ratio selection device (200) selecting a ratio code and transmitting said selected ratio code to the input of said temporary storage memory (301);
• said gearbox condition detection device (500) producing a gearbox condition code and transmitting said bearbox condition code to said first comparator (302);
• and, when said first comparator (302) detects a difference between said ratio code and said gearbox condition code, said first comparator (302) emitting:
• a "progression" pulse for increasing by one speed if the selected ratio code is greater than said gearbox condition code;
• and
• a "regression" pulse for decreasing by one speed if the selected ratio code is less than said gearbox condition code;
• said electronic assembly also including a validity detector (306) operably and electrically connected to said temporary storage memory (301);
• said temporary storage memory (301) transmitting an input code to said validity detector (306);
• said detector (306) detecting the validity of the input code received from the temporary storage memory (301);
• said electronic assembly also including a first AND gate (305), a "Neutral" memory (317), and a temporary storage means (326);
• the output of said validity detector (306) and the output of said first comparator (302) being both connected as inputs to said first AND gate (305);
• the output of said first AND gate (305) being electrically connected to and shared between said "Neutral" memory (317), said temporary storage means (326), and said gearbox control device (400);
• said first AND gate (305) emitting an executive order to execute the change of ratio when the imbalance of the first comparator (302) and the validity of the codes are confirmed;
• said executive order producing:
• an order for said temporary storage means (326) to memorize the nature of said change of ratio;
• an order to open the clutch;
• an order to bring the gearbox into "Neutral";
• and
• an order to store said selected ratio code in said temporary storage memory (301) when the following three requirements are met:
• (a) the parity of the selected ratio code has been checked and found correct;
• (b) said executive order is present;
• and (c) said temporary storage memory (301) is not already in a storage condition.