Electronic control system for an internal combustion engine with correction means for correcting value determined by the control system with reference to atmospheric air pressure

Claim 2

An electronic control system for an internal combustion engine for controlling the engine operation based on at least an intake vacuum pressure of the engine and an atmospheric air pressure comprising: a pressure sensor for measuring a pressure introduced; switching means for selectively introducing an intake vacuum pressure and an atmospheric air pressure into said pressure sensor; signal generating means for producing a signal for switching over said switching means; and a control unit for receiving a pressure signal from said pressure sensor and producing a control signal for controlling the engine operation.

Claim 3

An electronic control system for an internal combustion engine for controlling the engine operation based on various engine control parameters comprising: an engine speed sensor for determining the engine revolution speed and producing an engine speed signal representative of the determined engine speed; engine temperature sensor for determining the engine temperature and producing an engine temperature signal representative of the determined engine temperature; engine load sensor for determining the load conditions of the engine, said engine load sensor including a pressure sensor for determining a pressure introduced; switching means associated with said pressure sensor for selectively introducing vacuum pressure and an atmospheric pressure into said pressure sensor; a control unit for controlling fuel supply, spark ignition and exhaust gas recirculation, said control unit determining control values for controlling engine operation on the basis of the sensor signals fed from the engine speed sensor, engine temperature sensor and engine load sensor; and switch signal generating means, incorporated within said control unit and associated with said switching means, for producing a switching signal for controlling switching over said switching means.

Claim 4

An electronic control system for an internal combustion engine for controlling the engine operation based on various engine control parameters comprising: an engine speed sensor for determining the engine revolution speed and producing an engine speed signal representative of the determined engine speed; engine temperature sensor for determining the engine temperature and producing an engine temperature signal representative of the determined engine temperature; engine load sensor for determining the load conditions of the engine, said engine load sensor including a pressure sensor for determining a pressure introduced; switching means associated with said pressure sensor for selectively introducing vacuum pressure and an atmospheric pressure into said pressure sensor; a control unit for controlling fuel supply, spark ignition and exhaust gas recirculation, said control unit determining control values for controlling engine operation on the basis of the sensor signals fed from the engine speed sensor, engine temperature sensor and engine load sensor; and switch signal generating means, incorporated within said control unit and associated with said switching means, for producing a switching signal for controlling switching over said switching means.

Claim 5

The system as set forth in claim 1 or 2, wherein said switching means comprises a flow control valve assembly including a valve housing having first inlet port communicating with the intake manifold, second inlet port communicating with the ambient air, and an outlet port communicating with said pressure sensor, a valve member disposed within said valve housing and being movable between a first position wherein said first inlet port communicates with said outlet port and second position where said second port communicates with said outlet port, and an actuator for moving said valve member between said first and second position, said actuator being responsive to said signal supplied from the signal generating means.

Claim 6

The system as set forth in claim 3, wherein said signal generating means produces the signal to be supplied to said switching means in synchronism with the engine revolution.

Claim 7

The system as set forth in claim 3, wherein said control unit comprises a multiplexer, an arithmetic circuit, and an output unit, said multiplexer being responsive to said signal supplied from said signal generating means for selectively inputting the sensor signal to said arithmetic circuit.

Claim 10

The method as set forth in claim 6, wherein said method further comprises: determining air/fuel ratio based on the oxygen concentration in the exhaust gas; determining spark ignition timing based on the determined air/fuel ratio according to the atmospheric air pressure.

Claim 11

The method as set forth in claim 6 or 7, wherein said method further comprises: determining a basic value of exhaust gas recirculation rate for recirculating the exhaust gas into the engine cylinder; and correcting the determined basic exhaust gas recirculation rate depending on a correction value determined according to atmospheric air pressure.

Claim 12

An electronic control system for an internal combustion engine for controlling engine operation based on at least an intake vacuum pressure of the engine and an atmospheric air pressure comprising: a pressure sensor for measuring a pressure introduced and producing a pressure signal representative of said pressure introduced; switching means, associated with said pressure sensor, for selectively introducing an intake vacuum pressure and an atmospheric air pressure into said pressure sensor, said switching means periodically switching introducing of said intake vacuum pressure and said atmospheric pressure to said pressure sensor at a given timing; and a control unit for receiving said pressure signal from said pressure sensor and producing a control signal for controlling the engine operation.

Claim 13

An electronic control system for an internal combustion engine for controlling engine operation based on at least an intake vacuum pressure of the engine and an atmospheric air pressure comprising: a pressure sensor for measuring a pressure introduced and producing a pressure signal representative of said pressure introduced; switching means, associated with said pressure sensor, for selectively introducing an intake vacuum pressure and an atmospheric air pressure into said pressure sensor, said switching means periodically switching introducing of said intake vacuum pressure and said atmospheric pressure to said pressure sensor at a given timing; and a control unit for receiving said pressure signal from said pressure sensor and producing a control signal for controlling the engine operation.

Claim 14

An electronic control system for an internal combustion engine for controlling engine operation based on various engine control parameters comprising: an engine speed sensor for determining engine revolution speed and producing an engine speed signal representative of the determined engine speed; an engine temperature sensor for determining engine temperature and producing an engine temperature signal representative of the determined engine temperature; an engine load sensor for determining load conditions of the engine, said engine load sensor including a pressure sensor for determining a pressure introduced and producing a pressure signal representative of said pressure introduced; switching means associated with said pressure sensor for selectively introducing vacuum pressure and an atmospheric pressure into said pressure sensor, said switching means being operative at a given timing for changing over introduction of said intake pressure and said atmospheric pressure; and a control unit for controlling fuel supply, spark ignition and exhaust gas recirculation, said control unit determining control values for controlling engine operation on the basis of the signals produced by the engine speed sensor, engine temperature sensor and engine load sensor.

Claim 15

An electronic control system for an internal combustion engine for controlling engine operation based on various engine control parameters comprising: an engine speed sensor for determining engine revolution speed and producing an engine speed signal representative of the determined engine speed; an engine temperature sensor for determining engine temperature and producing an engine temperature signal representative of the determined engine temperature; an engine load sensor for determining load conditions of the engine, said engine load sensor including a pressure sensor for determining a pressure introduced and producing a pressure signal representative of said pressure introduced; switching means associated with said pressure sensor for selectively introducing vacuum pressure and an atmospheric pressure into said pressure sensor, said switching means being operative at a given timing for changing over introduction of said intake pressure and said atmospheric pressure; and a control unit for controlling fuel supply, spark ignition and exhaust gas recirculation, said control unit determining control values for controlling engine operation on the basis of the signals produced by the engine speed sensor, engine temperature sensor and engine load sensor.

Claim 16

An electronic control system for an internal combustion engine for controlling engine operation based on at least an intake vacuum pressure of the engine and an atmospheric air pressure comprising: a pressure sensor for measuring a pressure introduced and producing a pressure signal representative of said pressure introduced; switching means, associated with said pressure sensor, for selectively introducing an intake vacuum pressure and an atmospheric air pressure into said pressure sensor; and a control unit, associated with said switching means to produce a periodic signal for operating said switching means for switching introduction of said intake vacuum pressure and said atmospheric pressure at a given timing, said control unit receiving said pressure signal from said pressure sensor and producing a control signal for controlling the engine operation.

Claim 17

An electronic control system for an internal combustion engine for controlling engine operation based on at least an intake vacuum pressure of the engine and an atmospheric air pressure comprising: a pressure sensor for measuring a pressure introduced and producing a pressure signal representative of said pressure introduced; switching means, associated with said pressure sensor, for selectively introducing an intake vacuum pressure and an atmospheric air pressure into said pressure sensor; and a control unit, associated with said switching means to produce a periodic signal for operating said switching means for switching introduction of said intake vacuum pressure and said atmospheric pressure at a given timing, said control unit receiving said pressure signal from said pressure sensor and producing a control signal for controlling the engine operation.

Claim 18

An electronic control system for an internal combustion engine for controlling engine operation based on various engine control parameters comprising: an engine speed sensor for determining the engine revolution speed and producing an engine speed signal representative of the determined engine speed; engine temperature sensor for determining the engine temperature and producing an engine temperature signal representative of the determined engine temperature; engine load sensor for determining the load conditions of the engine, said engine load sensor including a pressure sensor for determining a pressure introduced and producing a pressure signal representative of said pressure introduced; switching means associated with said pressure sensor for selectively introducing vacuum pressure and an atmospheric pressure into said pressure sensor; and a control unit associated with said switching means to produce a periodic signal for operating said switching means at a given timing, said control unit controlling fuel supply, spark ignition and exhaust gas recirculation, said control unit determining control values for controlling engine operation on the basis of the signals produced by the engine speed sensor, engine temperature sensor and engine load sensor.

Claim 19

An electronic control system for an internal combustion engine for controlling engine operation based on various engine control parameters comprising: an engine speed sensor for determining the engine revolution speed and producing an engine speed signal representative of the determined engine speed; engine temperature sensor for determining the engine temperature and producing an engine temperature signal representative of the determined engine temperature; engine load sensor for determining the load conditions of the engine, said engine load sensor including a pressure sensor for determining a pressure introduced and producing a pressure signal representative of said pressure introduced; switching means associated with said pressure sensor for selectively introducing vacuum pressure and an atmospheric pressure into said pressure sensor; and a control unit associated with said switching means to produce a periodic signal for operating said switching means at a given timing, said control unit controlling fuel supply, spark ignition and exhaust gas recirculation, said control unit determining control values for controlling engine operation on the basis of the signals produced by the engine speed sensor, engine temperature sensor and engine load sensor.

Claim 20

The system as set forth in claim 9 or 10, wherein said switching means comprises a flow control valve assembly including a valve housing having a first inlet port communicating with an intake manifold, a second inlet port communicating with atmospheric pressure, and an outlet port communicating with said pressure sensor, a valve member disposed within said valve housing and being movable between a first position wherein said first inlet port communicates with said outlet port and second position where said second inlet port communicates with said outlet port, and an actuator for moving said valve member between said first and second positions, and switching signal generating means associated with said switching means for supplying a signal to said switching means for controlling said actuator to move said valve member.

Claim 21

The system as set forth in claim 13, wherein said control unit comprises a multiplexer connected to receive said sensor signals, an arithmetic circuit, and an output unit, said multiplexer being responsive to said signal supplied from said switching signal generating means for selectively inputting said sensor signals to said arithmetic circuit.

Claim 22

The system as set forth in claim 11 or 12, wherein said switching means comprises a flow control valve assembly including a valve housing having a first inlet port communicating with an intake manifold, a second inlet port communicating with ambient air, and an outlet port communicating with said pressure sensor, a valve member disposed within said valve housing and being movable between a first position wherein said first inlet port communicates with said outlet port and second position where said second inlet port communicates with said outlet port and an actuator for moving said valve member between said first and second positions, said control unit including switch signal generating means for producing said signal for operating said switching means and said actuator being responsive to said signal from the switching signal generating means.

Claim 23

The system as set forth in claim 15, wherein said control unit comprises a multiplexer connected to receive said sensor signals, an arithmetic circuit, and an output unit, said multiplexer being responsive to said signal supplied from said switching signal generating means for selectively inputting said sensor signals to said arithmetic circuit.