Vehicle control device and vehicle control program

Abstract

To improve oxygen storage capacity of a three-way catalyst.SOLUTION: A vehicle includes an internal combustion engine and a control device. The internal combustion engine includes: a cylinder for burning fuel; an exhaust passage for causing exhaust gas discharged from the cylinder to flow; a three-way catalyst located in the exhaust passage; a fuel injection valve for supplying the fuel to the cylinder; and a throttle valve for regulating an amount of intake air to be supplied to the cylinder. The three-way catalyst includes: a solid solution containing ceria and zirconia; and rhodium supported by the zirconia. When a temperature predetermined to 850°C or higher is defined as a specified temperature, the control device executes first treatment for supplying gas leaner than that when an air-fuel mixture comprising the fuel and the intake air is burned at a theoretical air-fuel ratio to the three-way catalyst having the specified temperature or higher. After the first treatment, the control device executes second treatment for supplying gas richer than that when the air-fuel mixture is burned at the theoretical air-fuel ratio to the three-way catalyst having the specified temperature or higher.SELECTED DRAWING: Figure 3

Claims

1. A control device applicable to a vehicle equipped with an internal combustion engine, The internal combustion engine comprises a cylinder for burning fuel, an exhaust passage for circulating exhaust gas discharged from the cylinder, a three-way catalytic converter located in the exhaust passage, a fuel injection valve for supplying fuel to the cylinder, and a throttle valve for adjusting the amount of intake air supplied to the cylinder. The three-way catalyst comprises a solid solution containing ceria and zirconia, and rhodium supported on the zirconia. When a predetermined temperature of 850°C or higher is set as the specified temperature, A first treatment is performed in which, provided that the oxygen storage capacity of the three-way catalyst is below a specified value, a gas leaner than the gas produced when the fuel-intake mixture is burned at a stoichiometric air-fuel ratio is supplied to the three-way catalyst at a temperature above a specified temperature, A second process is performed after the first process, in which a gas richer than the gas obtained when the mixture is burned at the stoichiometric air-fuel ratio is supplied to the three-way catalyst at a specified temperature or higher. It is possible to do this, In the first process, the fuel injection valve and the throttle valve are controlled to create a leaner air-fuel ratio than the stoichiometric ratio. In the second process, the fuel injection valve and the throttle valve are controlled to create a richer air-fuel ratio than the stoichiometric ratio. If the oxygen storage capacity of the three-way catalyst exceeds a specified value after performing the first and second processes, the first and second processes will not be performed thereafter. Vehicle control system.

2. The vehicle, in addition to the internal combustion engine, includes a motor generator connected to the crankshaft of the internal combustion engine, and a battery that can be charged by the electricity generated by the motor generator. When performing one or more of the first and second processes, the load on the internal combustion engine is increased by charging the battery with electricity generated by the motor generator using the output of the internal combustion engine. A vehicle control device according to claim 1.

3. When a predetermined temperature lower than the aforementioned specified temperature is set as the starting temperature, As a necessary condition, the temperature of the three-way catalyst is above the starting temperature and below the specified temperature. When performing one or more of the first and second processes, the load on the internal combustion engine is increased by charging the battery with electricity generated by the motor generator using the output of the internal combustion engine. The vehicle control device according to claim 2.

4. This applies to control devices used in vehicles equipped with internal combustion engines. The internal combustion engine comprises a cylinder for burning fuel, an exhaust passage for circulating exhaust gas discharged from the cylinder, a three-way catalytic converter located in the exhaust passage, a fuel injection valve for supplying fuel to the cylinder, and a throttle valve for adjusting the amount of intake air supplied to the cylinder. The three-way catalyst comprises a solid solution containing ceria and zirconia, and rhodium supported on the zirconia. When a predetermined temperature of 850°C or higher is set as the specified temperature, The control device, A first treatment is performed in which, provided that the oxygen storage capacity of the three-way catalyst is below a specified value, a gas leaner than the gas produced when the fuel-intake mixture is burned at a stoichiometric air-fuel ratio is supplied to the three-way catalyst at a temperature above a specified temperature, A second process is performed after the first process, in which a gas richer than the gas obtained when the mixture is burned at the stoichiometric air-fuel ratio is supplied to the three-way catalyst at a specified temperature or higher. Make it run, In the first process, the fuel injection valve and the throttle valve are controlled to create a leaner air-fuel ratio than the stoichiometric ratio. In the second process, the fuel injection valve and the throttle valve are controlled to create a richer air-fuel ratio than the stoichiometric ratio. The control device, If the oxygen storage capacity of the three-way catalyst exceeds a specified value after performing the first and second processes, the first and second processes will not be performed thereafter. Vehicle control program.

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