CN-122014449-A - Control device for vehicle

Abstract

Provided is a vehicle control device for an engine-mounted vehicle. The engine is provided with a three-way catalyst device provided in an exhaust passage. The control device is provided with a processing circuit. The processing circuit is configured to execute a determination process for determining whether or not the amount of ammonia discharged from the three-way catalyst device is large, and a combustion temperature reduction process for reducing the combustion temperature of the engine when the determination process determines that the amount of ammonia discharged is large.

Inventors

• YAMAMOTO RYOJI

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260512

Application Date

20251103

Priority Date

20241112

Claims (5)

1. 1. A control device for a vehicle is provided with an engine equipped with a three-way catalyst device provided in an exhaust passage, The control device is provided with a processing circuit, The processing circuit is configured to implement: A determination process of determining whether or not the ammonia discharge amount from the three-way catalyst device is large, and And a combustion temperature reduction process of reducing a combustion temperature of the engine when it is determined in the determination process that the discharge amount is large.
2. 2. The control device of a vehicle according to claim 1, wherein, The engine further includes an air-fuel ratio sensor provided in a portion of the exhaust passage downstream of the three-way catalyst device, The processing circuit is configured to perform air-fuel ratio sub-feedback control based on a detection result of the air-fuel ratio sensor.
3. 3. The control device of a vehicle according to claim 1, wherein, The combustion temperature reduction process includes a process of increasing the recirculation amount of exhaust gas to intake air.
4. 4. The control device of a vehicle according to claim 1, wherein, The combustion temperature reduction process includes a process of retarding the ignition timing.
5. 5. The control device of a vehicle according to claim 1, wherein, The vehicle is a hybrid vehicle provided with the engine and the motor as driving sources for running, The processing circuit is configured to execute torque compensation processing for compensating for a decrease in engine torque caused by execution of the combustion temperature decrease processing with the motor torque.

Description

Control device for vehicle Technical Field The present disclosure relates to a control device of a vehicle. Background Japanese patent application laid-open No. 2015-124683 describes a control device for a hybrid vehicle having an engine and an electric motor provided with a three-way catalyst device as drive sources. The hybrid vehicle to which the control device is applied is configured to be capable of switching between electric running in which the motor is stopped and the electric motor is driven to run and hybrid running in which the motor is driven to run, depending on the situation. The control device suppresses the emission of NOx to the atmosphere by increasing the fuel injection amount of the engine when switching from electric running to hybrid running. Disclosure of Invention Problems to be solved by the invention When the interior of the three-way catalytic device is a reducing atmosphere and the temperature is high, ammonia may be generated. Therefore, when the fuel injection amount is increased in order to reduce the NOx discharge amount, there is a possibility that the ammonia discharge amount is increased. Means for solving the problems A control device for a vehicle according to an aspect of the present disclosure is a control device for a vehicle on which an engine is mounted. The engine is provided with a three-way catalyst device provided in an exhaust passage. The control device is provided with a processing circuit. The processing circuit is configured to perform a determination process of determining whether or not the amount of ammonia discharged from the three-way catalyst device is large, and a combustion temperature reduction process of reducing the combustion temperature of the engine when the determination process determines that the amount of ammonia discharged is large. Drawings Fig. 1 is a diagram schematically showing the structure of an embodiment of a control device for a vehicle. Fig. 2 is a flowchart of a process performed by the control apparatus of fig. 1. Detailed Description An embodiment of the control device for a vehicle is described in detail below. Structure of control device for vehicle The structure of the present embodiment will be described with reference to fig. 1. The vehicle to which the control device of the present embodiment is applied is a hybrid vehicle provided with an engine 10 that generates driving force by fuel combustion and a motor 30 that generates driving force by power supply from a battery 31 as driving sources for running. The motor 30 is electrically connected to a battery 31 via an inverter 32. The engine 10 includes a combustion chamber 11 for combusting a mixture, an intake passage 12 as a path for introducing intake air into the combustion chamber 11, and an exhaust passage 13 as a path for exhausting exhaust gas from the combustion chamber 11. The intake passage 12 is provided with an air cleaner 14 for filtering impurities such as dust in intake air, an air flow meter 15 for detecting an intake air flow rate, and a throttle valve 16 for adjusting the intake air flow rate. The engine 10 includes an injector 17 that injects fuel into intake air for combustion in the combustion chamber 11, and an ignition device 18 that ignites the air-fuel mixture in the combustion chamber 11 by spark discharge. The exhaust passage 13 of the engine 10 is provided with a three-way catalyst device 19 carrying a three-way catalyst for purifying exhaust gas. The three-way catalytic device 19 has an oxygen storage capacity. The exhaust passage 13 is provided with two air-fuel ratio sensors, a front air-fuel ratio sensor 20 and a rear air-fuel ratio sensor 21. The front air-fuel ratio sensor 20 is provided in a portion of the exhaust passage 13 upstream of the three-way catalyst device 19. The rear air-fuel ratio sensor 21 is provided in a portion of the exhaust passage 13 downstream of the three-way catalyst device 19. A nitrogen oxide (NOx) sensor 22 that detects the amount of NOx in the exhaust gas is provided in a portion of the exhaust passage 13 downstream of the three-way catalyst device 19. The engine 10 further includes a EGR (Exhaust Gas Recirculation) passage 23 as a recirculation path for recirculating the exhaust gas to the intake air. In the following description, the exhaust gas recirculated into the intake air through the EGR passage 23 is referred to as EGR gas. An EGR cooler 24 for cooling the EGR gas and an EGR valve 25 for adjusting the flow rate of the EGR gas are provided in the EGR passage 23. The control device of the present embodiment is an electronic control unit 40 including a processing circuit 41 and a storage device 42. The storage device 42 stores therein programs and data for vehicle control. The electronic control unit 40 executes a program read from the storage device 42 by the processing circuit 41 to implement various processes for vehicle control. The detection results of various sensors provided in each part of the