Electronic engine control device, vehicle equipped with electronic engine control device, and electronic engine control method
First Claim
1. An electronic engine control device that controls an engine, said electronic engine control device comprising:
- the engine that converts combustion energy produced by combustion of an air fuel mixture or a mixture of the air and a fuel into kinetic energy;
an exhaust catalyst that purifies an exhaust gas from the engine;
a fuel injection unit that injects the fuel into the engine;
a catalyst deterioration control module that controls the fuel injection unit to keep fuel injection and idles the engine regardless of fulfillment of a preset fuel cut condition, when temperature of the exhaust catalyst is in a specified temperature range causing deterioration of the catalyst; and
an engine stop restart control module that stops the engine upon fulfillment of a preset engine stop condition and restarts the engine upon subsequent fulfillment of a preset engine restart condition, upon fulfillment of the preset engine stop condition during idling of the engine by said catalyst deterioration control module, said engine stop restart control module idling the engine under application of a high load to the exhaust catalyst, while stopping the engine under application of a low load to the exhaust catalyst.
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Accused Products
Abstract
On the premise that a target torque of an engine is equal to 0, that observed catalyst temperature is in a specified temperature range causing deterioration of the catalyst, and that the engine runs idle without a fuel cut regardless of fulfillment of preset fuel cut conditions, the control procedure of the invention determines whether a predetermined engine stop condition is fulfilled (step S300). Upon fulfillment of the predetermined engine stop condition, the control procedure subsequently determines whether a high load is applied to an exhaust catalyst (step S320). The engine runs idle (step S310) when a high load is applied to the exhaust catalyst. The relatively low-temperature exhaust gas from the engine in the idling state forcibly cools down the exhaust catalyst. This prevents the exhaust catalyst from being kept at high temperature. When a low load is applied to the exhaust catalyst at step S320, on the other hand, the engine is stopped (step S330). The stop of the engine cuts off the air flow through the exhaust catalyst. The exhaust catalyst is thus not exposed to the lean exhaust atmosphere and does not significantly deteriorate even at high temperature.
46 Citations
16 Claims
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1. An electronic engine control device that controls an engine, said electronic engine control device comprising:
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the engine that converts combustion energy produced by combustion of an air fuel mixture or a mixture of the air and a fuel into kinetic energy;
an exhaust catalyst that purifies an exhaust gas from the engine;
a fuel injection unit that injects the fuel into the engine;
a catalyst deterioration control module that controls the fuel injection unit to keep fuel injection and idles the engine regardless of fulfillment of a preset fuel cut condition, when temperature of the exhaust catalyst is in a specified temperature range causing deterioration of the catalyst; and
an engine stop restart control module that stops the engine upon fulfillment of a preset engine stop condition and restarts the engine upon subsequent fulfillment of a preset engine restart condition, upon fulfillment of the preset engine stop condition during idling of the engine by said catalyst deterioration control module, said engine stop restart control module idling the engine under application of a high load to the exhaust catalyst, while stopping the engine under application of a low load to the exhaust catalyst. - View Dependent Claims (3, 5, 7, 9, 11, 13, 14)
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2. An electronic engine control device that controls an engine, said electronic engine control device comprising:
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the engine that converts combustion energy produced by combustion of an air fuel mixture or a mixture of the air and a fuel into kinetic energy;
an exhaust catalyst that purifies an exhaust gas from the engine; and
an engine stop restart control module that stops the engine upon fulfillment of a preset engine stop condition and restarts the engine upon subsequent fulfillment of a preset engine restart condition, upon fulfillment of the preset engine stop condition, said engine stop restart control module idling the engine under application of a high load to the exhaust catalyst, while stopping the engine under application of a low load to the exhaust catalyst. - View Dependent Claims (4, 6, 8, 10, 12)
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15. An electronic engine control method that controls an engine, said electronic engine control method comprising the steps of:
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(a) keeping fuel injection and idling the engine regardless of fulfillment of a preset fuel cut condition, when temperature of an exhaust catalyst, which purifies an exhaust gas from the engine, is in a specified temperature range causing deterioration of the catalyst;
(b) upon fulfillment of a preset engine stop condition during idling of the engine in step (a), idling the engine under application of a high load to the exhaust catalyst, while stopping the engine under application of a low load to the exhaust catalyst; and
(c) restarting the engine upon fulfillment of a preset engine restart condition after stop of the engine in step (b).
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16. An electronic engine control method that controls an engine, said electronic engine control method comprising the steps of:
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(a) upon fulfillment of a preset engine stop condition, idling the engine under application of a high load to an exhaust catalyst, while stopping the engine under application of a low load to the exhaust catalyst; and
(b) restarting the engine upon fulfillment of a preset engine restart condition after stop of the engine in step (a)
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Specification