# US 5,706,782 A · Engine control system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,782 A - Document ID: US5706782A - Status: Granted - Kind: A - Application number: 08/810,365 - Filed: 1997-03-03 - Granted: 1998-01-13 - Earliest claimed: 1996-03-01 - Assignees: Fuji Jukogyo Kabushiki Kaisha - Inventors: Masaru Kurihara - Web page: https://patentgrep.com/patent/US5706782A ## CPC - F02D 41/18: by measuring intake air flow - F02D 11/105: {characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque} - F02D 41/047: {Taking into account fuel evaporation or wall wetting; (special correction after fuel cut-off F02D41/126)} - F02D 41/1401: {characterised by the control or regulation method (F02D41/1473, F02D41/1477 take precedence)} - F02D 2041/1431: {the system including an input-output delay} - F02D 2041/1433: {using a model or simulation of the system} - F02D 2041/1434: {Inverse model} - F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W) ## Abstract An engine control apparatus controls a throttle valve opening degree in response to a demand output of a driver. A target charged intake air amount of air taken into a cylinder per intake stroke is set in response to the demand output. Based on an air pressure generated at an upstream side of a throttle valve, the maximum actual charged intake air amount is set as a maximum value of the actual charged intake air amount taken into the cylinder per intake stroke. The target charged intake air amount is normalized by calculating a ratio of the target charged intake air amount to the maximum actual intake air amount. The throttle valve opening degree is set based on the normalized target charged intake air amount and an engine speed. Then, a signal for actuating the throttle valve is output to a throttle actuator so that the throttle valve has the set opening degree. Fuel injection amount is set based on the target charged intake air amount. ## Claims ### Claim 1 A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising: means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke; means, based on an air pressure generated at an upstream side of the throttle valve, for setting the maximum actual charged intake air amount as the maximum value of an actual charged intake air amount taken into the cylinder per intake stroke; means for normalizing the target charged intake air amount by calculating a ratio of the target charged intake air amount to the maximum actual charged intake air amount; means for setting the throttle valve opening degree based on the normalized target charged intake air amount and an engine speed; and means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the opening degree set by the throttle valve opening degree setting means. ### Claim 2 (depends on 1) An apparatus according to claim 1, further comprising: means for setting a fuel injection amount based on the target charged intake air amount; and means for driving the injector so that the fuel injection amount set by the fuel injection amount setting means is supplied to the engine. ### Claim 3 (depends on 2) An apparatus according to claim 2, further comprising means for setting an air amount corresponding to a delay due to fuel adhering to an inner-wall of an intake port of the engine during one cycle of the cylinder by means of a fuel adhering delay compensating model based on the engine speed and the target charged intake air amount, thus compensating for the target charged intake air amount using the air amount corresponding to the delay. ### Claim 4 (depends on 2) An apparatus according to claim 2, further comprising: means for setting an actual charged intake air amount taken into the cylinder per intake stroke based on an intake port air pressure generated at a downstream side of the throttle valve:; and means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed. ### Claim 5 (depends on 3) An apparatus according to claim 3, further comprising: means for setting an actual charged intake air amount taken into the cylinder per intake stroke based on an intake port air pressure generated at a downstream side of the throttle valve:; and means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed, wherein the air amount corresponding to the delay is added to the upper limiting value when the air amount corresponding to the delay is a positive value. ### Claim 6 (depends on 2) An apparatus according to claim 2, further comprising: means for setting an actual charged intake air amount taken into the cylinder per intake stroke based on an air pressure generated at a downstream side of the throttle valve:; and means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and the engine speed. ### Claim 7 (depends on 3) An apparatus according to claim 3, further comprising: means for setting an actual charged intake air amount taken into the cylinder per intake stroke based on an intake port air pressure generated at a downstream side of the throttle valve:; and means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and engine speed, wherein the air amount corresponding to the delay is added to the lower limiting value when the air amount corresponding to the delay is a negative value. ### Claim 8 (depends on 2) An apparatus according to claim 2, further comprising means for executing a dead time process, the dead time being corresponding to a delay in actuating the throttle valve by the actuator in response to the target charged intake air amount. ### Claim 9 A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising: means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke; means, based on an air pressure generated at a downstream side of the throttle valve, for setting an actual charged intake air amount taken into the cylinder per intake stroke; means, responsive at least to the target and actual charged intake air amounts, for calculating, using a reverse chamber model, a throttle valve opening degree required for equalizing the target charged intake air amount and an actual charged intake air amount taken into the cylinder after an elapse of a minute period; and means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the calculated opening degree. ### Claim 10 (depends on 9) An apparatus according to claim 9, further comprising: means for setting a fuel injection amount based on the target charged intake air amount; and means for driving the injector so that the fuel injection amount set by the fuel injection amount setting means is supplied to the engine. ### Claim 11 (depends on 10) An apparatus according to claim 10, further comprising means for setting an air amount corresponding to a delay due to fuel adhering to an inner-wall of an intake port of the engine during one cycle of the cylinder by means of a fuel adhering delay compensating model based on the engine speed and the target charged intake air amount, thus compensating for the target charged intake air amount using the air amount corresponding to the delay. ### Claim 12 (depends on 10) An apparatus according to claim 10, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed. ### Claim 13 (depends on 11) An apparatus according to claim 11, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed, wherein the air amount corresponding to the delay is added to the upper limiting value when the air amount corresponding to the delay is a positive value. ### Claim 14 (depends on 10) An apparatus according to claim 10, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and the engine speed. ### Claim 15 (depends on 11) An apparatus according to claim 11, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and engine speed, wherein the air amount corresponding to the delay is added to the lower limiting value when the air amount corresponding to the delay is a negative value. ### Claim 16 (depends on 10) An apparatus according to claim 10, further comprising means for executing a dead time process, the dead time being corresponding to a delay in actuating the throttle valve by the actuator in response to the target charged intake air amount. ### Claim 17 A control apparatus of an engine for controlling a throttle valve opening degree in response to a demand output of a driver, the engine having at least one cylinder, an intake pipe connected to the cylinder, a throttle valve disposed in the intake pipe, a throttle actuator for actuating the throttle valve and an injector for supplying fuel to the engine, the apparatus comprising: means, responsive to the demand output, for setting a target charged intake air amount of air taken into the cylinder per intake stroke; means, based on an air pressure generated at a downstream side of the throttle valve, for setting an actual charged intake air amount taken into the cylinder per intake stroke; means, based on an air pressure generated at an upstream side of the throttle valve, for setting the maximum charged intake air amount as the maximum value of an actual charged intake air amount taken into the cylinder per intake stroke; means for setting the throttle valve opening degree based on an intake air ratio and an engine speed indicating value, the intake air ratio being a ratio of a mean value of the target charged intake air amount and the actual charged intake air amount to the maximum charged intake air amount, the engine speed indicating value being calculated by adding an engine speed and an increment or a decrement of the engine speed based on the target charged intake air amount and the actual charged intake air amount; and means for outputting a signal for actuating the throttle valve to the throttle actuator so that the throttle valve has the opening degree set by the throttle valve opening degree setting means. ### Claim 18 (depends on 17) An apparatus according to claim 17, further comprising: means for setting a fuel injection amount based on the target charged intake air amount; and means for driving the injector so that the fuel injection amount set by the fuel injection amount setting means is supplied to the engine. ### Claim 19 (depends on 18) An apparatus according to claim 18, further comprising means for setting an air amount corresponding to a delay due to fuel adhering to an inner-wall of an intake port of the engine during one cycle of the cylinder by means of a fuel adhering delay compensating model based on the engine speed and the target charged intake air amount, thus compensating for the target charged intake air amount using the air amount corresponding to the delay. ### Claim 20 (depends on 18) An apparatus according to claim 18, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed. ### Claim 21 (depends on 19) An apparatus according to claim 19, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not increase more than an upper limiting value set based on the actual charged intake air amount, the engine speed and a predetermined maximum engine speed, wherein the air amount corresponding to the delay is added to the upper limiting value when the air amount corresponding to the delay is a positive value. ### Claim 22 (depends on 18) An apparatus according to claim 18, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and the engine speed. ### Claim 23 (depends on 19) An apparatus according to claim 19, further comprising means for limiting the target charged intake air amount so that the target charged intake air amount does not decrease less than a lower limiting value set based on the actual charged intake air amount and engine speed, wherein the air amount corresponding to the delay is added to the lower limiting value when the air amount corresponding to the delay is a negative value. ### Claim 24 (depends on 18) An apparatus according to claim 18, further comprising means for executing a dead time process, the dead time being corresponding to a delay in actuating the throttle valve by the actuator in response to the target charged intake air amount.