Method and system to reduce polluting emission from internal combustion engines

Claim 2

System to reduce polluting components from the exhaust of internal combustion engines during warm-up of the engine, in combination with an engine having an inlet manifold, a throttle, timing control means operable within a predetermined range for timing the ignition of the engine, within said range, with respect to piston position, and an exhaust system including an exhaust manifold, said pollution reduciNg system comprising means (25, 26, 51, 52) continuously effective during engine operation to adjust the ignition timing of the ignition system within said range, comprising a spark advance vacuum chamber means (25, 26) to advance or delay ignition timing within said range with respect to dead-center position of the piston; adjustment link means (24) connected to the ignition timing adjustment means; means controlling additional retardation of ignition timing of the ignition system, to a delay value of such magnitude that combustion will persist during at least a portion of the exhaust stroke of the engine in addition to the adjustment of the ignition timing, within said range, due to said continuously effective ignition timing means, comprising a control valve (31) interconnecting the spark delay chamber (25) to the inlet manifold of the engine during warm-up time of the engine and before the engine has reached said predetermined temperature, said valve (31) connecting the delay chamber to a suction port (37) located in the vicinity of the throttle (34) in the inlet to the engine; and means (30) responsive to temperature arising in the exhaust system of the engine during operation thereof, said temperature responsive means including means controlling the extent of travel of said link element to disable control by said additional ignition timing retardation means when said temperature responsive means senses that a predetermined temperature is exceeded.

Claim 3

System according to claim 1, wherein the means additionally retarding ignition timing of the ignition system comprises a link element (24) connected to adjust the timing of the ignition with respect to piston position; and means including stop means (27; 54) controlling the path of travel of said link element (24) under control of said temperature responsive means (30).

Claim 4

System according to claim 2, wherein the stop means comprises electromagnetically controlled means (29).

Claim 5

System according to claim 2, wherein the stop means include vacuum diaphragm chamber operated means (42).

Claim 6

System according to claim 4, wherein the temperature responsive means provide an output signal controlling a valve means, said valve means selectively connecting fluids under differential pressure to said vacuum chamber means.

Claim 7

System according to claim 2, wherein said link element (24) is formed with a notch (28), said stop means (27) engaging in the notch.

Claim 8

System according to claim 2 wherein the means continuously effective during engine operation to adjust ignition timing within said range comprises a spark advance vacuum chamber and a spark delay vacuum chamber; and the stop means controlling the path of travel of said link element (24) comprises a movable abutment (54) on said spark delay vacuum chamber movable in dependence on sensed temperature by said temperature responsive means (30) in the direction of said path.

Claim 9

System according to claim 1, wherein the means continuously effective during engine operation to adjust ignition timing within said range comprises a spark advance vacuum chamber and a spark delay vacuum chamber; and wherein the means additionally retarding ignition timing further comprises a vacuum bore (36) located in the inlet (35) to the engine, and means interconnecting said vacuum bore (36) with the spark advance chamber (26); and valve means (31) separating the spark advance chamber from said bore until the engine has reached said predetermined temperature.

Claim 10

System according to claim 8, further comprising means (57) interconnecting the ignition delay chamber (53) with the inlet manifold (32) of the engine until the engine has reached said predetermined temperature.

Claim 11

System according to claim 1, wherein the means continuously effective during engine operation to adjust ignition timing with said range comprises a spark advance vacuum chamber (51) and a spark delay vacuum chamber (52); and a control valve (57; 63) seLectively venting said chambers.

Claim 12

System according to claim 10, wherein said ignition timing retardation means comprises a vacuum chamber (53), said valve meas selectively venting said vacuum chamber.

Claim 13

System to reduce polluting components from the exhaust of internal combustion engines during warm-up of the engine, in combination with an engine having an inlet manifold, a throttle, timing control means operable within a predetermined range for timing the ignition of the engine, within said range, with respect to piston position, and an exhaust system including an exhaust manifold, said pollution reducing system comprising means (25, 26, 51, 52) continuously effective during engine operation to adjust the ignition timing of the ignition system within said range, comprising a spark advance vacuum chamber and a spark delay vacuum chamber; means (31, 33) controlling additional retardation of ignition timing of the ignition system, to a delay value of such magnitude that combustion will persist during at least a portion of the exhaust stroke of the engine in addition to the adjustment of the ignition timing, within said range, due to said continuously effective ignition timing means, and including a vacuum bore (36) located in the inlet (35) to the engine, means interconnecting said vacuum bore (36) with the spark advance chamber, and valve means (31) separating the spark advance chamber from said bore until the engine has reached a predetermined temperature; and means (30) responsive to temperatures arising in the exhaust system of the engine during operation thereof, said temperature responsive means controlling operation of said valve means (31) to disable control by said additional timing retardation means when said temperature resonsive means senses that the predetermined temperature is exceeded.

Claim 14

System to reduce polluting components from the exhaust of internal combustion engines during warm-up of the engine, in combination with an engine having an inlet manifold, a throttle, timing control means operable within a predetermined range for timing the ignition of the engine, within said range, with respect to piston position, and an exhaust system including an exhaust manifold, said pollution reducing system comprising means (25, 26, 51, 52) continuously effective during engine operation to adjust the ignition timing of the ignition system within said range, comprising a spark advance vacuum chamber and a spark delay vacuum chamber; means (31, 33) controlling additional retardation of ignition timing of the ignition system, to a delay value of such magnitude that combustion will persist during at least a portion of the exhaust stroke of the engine in addition to the adjustment of the ignition timing, within said range, due to said continuously effective ignition timing means, and including a vacuum bore (36) located in the inlet (35) to the engine, means interconnecting said vacuum bore (36) with the spark advance chamber, and valve means (31) separating the spark advance chamber from said bore until the engine has reached a predetermined temperature; and means (30) responsive to temperatures arising in the exhaust system of the engine during operation thereof, said temperature responsive means controlling operation of said valve means (31) to disable control by said additional timing retardation means when said temperature resonsive means senses that the predetermined temperature is exceeded.

Claim 15

System according to claim 12, further comprising means (57) interconnecting the ignition delay chamber (53) with the inlet manifold (32) of the engine until the engine has reached said predetermined temperature.

Claim 16

System according to claim 12, wherein the means additionally retarding ignition timing of the ignition system comprises a link element (24) connected to adjust the timing of the ignition with respect to piston position; and means including stop means (27; 54) controlling the path of travel of said link element (24) under control of said temperature responsive means (30).

Claim 17

System according to claim 12, wherein the means continuously effective during engine operation to adjust ignition timing within said range comprises a spark advance vacuum chamber (51) and a spark delay vacuum chamber (52); and a control valve (57; 63) selectively venting said chambers.

Claim 18

System to reduce polluting components from the exhaust of internal combustion engines during warm-up of the engine, in combination with an engine having an inlet manifold, a throttle, timing control means operable within a predetermined range for timing the ignition of the engine, within said range, with respect to piston position, and an exhaust system including an exhaust manifold, said pollution reducing system comprising means (25, 26, 51, 52) continuously effective during engine operation to adjust the ignition timing of the ignition system within said range; means (24, 27, 28, 53, 54) additionally retarding ignition timing of the ignition system, to a delay value of such magnitude that combustion will persist during at least a portion of the exhaust stroke of the engine in addition to the adjustment of the ignition timing, within said range, due to said continuously effective ignition timing means, said additional retarding means being selectively connectable to said ignition timing system; means (30) responsive to temperature arising in the engine during operation thereof, said temperature responsive means being connected to and controlling said additional ignition timing retardation means and disabling said additional ignitiOn timing retardation means when a predetermined temperature is sensed by said temperature responsive means; electromagnetically operable valve means (33) controlling air flow through said bypass; and means controlling the opening and closing of said valve means (33); said valve means being connected to said temperature responsive means (30), said valve means, during the warm-up period of the exhaust system of the engine being open so that said bypass permits air flow is in shunt to the throttles, and said valve means, upon sensing of said predetermined temperature by said temperature responsive means changing to a second state blocking air flow therethrough.

Claim 19

System to reduce polluting components from the exhaust of internal combustion engines during warm-up of the engine, in combination with an engine having an inlet manifold, a throttle, timing control means operable within a predetermined range for timing the ignition of the engine, within said range, with respect to piston position, and an exhaust system including an exhaust manifold, said pollution reducing system comprising means (25, 26, 51, 52) continuously effective during engine operation to adjust the ignition timing of the ignition system within said range; means (24, 27, 28, 53, 54) additionally retarding ignition timing of the ignition system, to a delay value of such magnitude that combustion will persist during at least a portion of the exhaust stroke of the engine in addition to the adjustment of the ignition timing, within said range, due to said continuously effective ignition timing means, said additional retarding means being selectively connectable to said ignition timing system; means (30) responsive to temperature arising in the engine during operation thereof, said temperature responsive means being connected to and controlling said additional ignition timing retardation means and disabling said additional ignitiOn timing retardation means when a predetermined temperature is sensed by said temperature responsive means; electromagnetically operable valve means (33) controlling air flow through said bypass; and means controlling the opening and closing of said valve means (33); said valve means being connected to said temperature responsive means (30), said valve means, during the warm-up period of the exhaust system of the engine being open so that said bypass permits air flow is in shunt to the throttles, and said valve means, upon sensing of said predetermined temperature by said temperature responsive means changing to a second state blocking air flow therethrough.

Claim 20

System according to claim 16, wherein the means additionally retarding ignition timing of the ignition system comprises a link element (24) connected to adjust the timing of the ignition with respect to piston position; and means including stop means (27; 54) controlling the path of travel of said link element (24) under control of said temperature responsive means (30).

Claim 21

System to reduce polluting components from the exhaust of internal combustion engines during warm-up of the engine, in combination with an engine having an inlet manifold, a throttle, timing control means operable within a predetermined range for timing the ignition of the engine, within said range, with respect to piston position, and an exhaust system including an exhaust manifold, said pollution reducing system comprising means (25, 26, 51, 52) continuously effective during enginen operation to adjust the ignition timing of the ignition system within said range; means (24, 27, 28, 53, 54) additionally retarding ignition timing of the ignition system, to a delay value of such magnitude that combustion will persist during at least a portion of the exhaust stroke of the engine in additioni to the adjustment of the ignition timing, within said range, due to said continuously effective ignition timing means, said additional retarding means being selectively connectable to said ignition timing system; means (30) responsive to temperatures arising in the engine during operation thereof, said temperature responsive means being connected to and controlling said additional ignition timing retardation means and disabling said additional ignition timing retardation means when a predetermined temperature is sensed by said temperature responsive means; valve means (33) controlling air flow through said bypass; a pneumatic pressure sensitive diaphragm operating means (45) connected to operate said valve means (33); and means, including a control valve means (57) interconnecting the pneumatically operating means with differential air pressure (32) to operate said valve means into open position during the warm-up period of the engine and before the engine has reached said predetermined temperature.

Claim 22

System to reduce polluting components from the exhaust of internal combustion engines during warm-up of the engine, in combination with an engine having an inlet manifold, a throttle, timing control means operable within a predetermined range for timing the ignition of the engine, within said range, with respect to piston position, and an exhaust system including an exhaust manifold, said pollution reducing system comprising means (25, 26, 51, 52) continuously effective during enginen operation to adjust the ignition timing of the ignition system within said range; means (24, 27, 28, 53, 54) additionally retarding ignition timing of the ignition system, to a delay value of such magnitude that combustion will persist during at least a portion of the exhaust stroke of the engine in additioni to the adjustment of the ignition timing, within said range, due to said continuously effective ignition timing means, said additional retarding means being selectively connectable to said ignition timing system; means (30) responsive to temperatures arising in the engine during operation thereof, said temperature responsive means being connected to and controlling said additional ignition timing retardation means and disabling said additional ignition timing retardation means when a predetermined temperature is sensed by said temperature responsive means; valve means (33) controlling air flow through said bypass; a pneumatic pressure sensitive diaphragm operating means (45) connected to operate said valve means (33); and means, including a control valve means (57) interconnecting the pneumatically operating means with differential air pressure (32) to operate said valve means into open position during the warm-up period of the engine and before the engine has reached said predetermined temperature.

Claim 23

System according to claim 18, wherein the means additionally retarding ignition timing of the ignition system comprises a link element (24) connected to adjust the timing of the ignition with respect to piston position; and means including stop means (27; 54) controlling the path oftravel of said link element (24) under control of said temperature responsive means (30).