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CN-117377605-B - Control method for hybrid vehicle and control device for hybrid vehicle

CN117377605BCN 117377605 BCN117377605 BCN 117377605BCN-117377605-B

Abstract

The hybrid vehicle is provided with a generator (6) that can supply electric power generated by the power generation to a battery (4), a driving motor (2) that drives a drive wheel (1) of the hybrid vehicle using electric power from the power generation of the power generation (4) or electric power generated by the power generation (6), an internal combustion engine (7) that drives the power generation (6), and a1 st exhaust gas purification device for purifying exhaust gas, which is provided in an exhaust passage of the internal combustion engine (7). When the temperature of the 1 st exhaust gas purification device is less than or equal to a prescribed temperature, the hybrid vehicle performs catalyst temperature increase control that retards the ignition timing of the internal combustion engine (7). With the catalyst temperature increase control, the ignition timing retard amount when the vehicle is in a state of vibrating as compared with the vehicle being stopped is increased as compared with the ignition timing retard amount when the vehicle is being stopped.

Inventors

  • Tsuyuki Tsuyoshi
  • ASHIKAGA AKIO

Assignees

  • 日产自动车株式会社

Dates

Publication Date
20260505
Application Date
20210519

Claims (5)

  1. 1. A control method of a hybrid vehicle, the hybrid vehicle having: a 1 st motor capable of supplying power generated by power generation to a battery; a2 nd motor that drives drive wheels of the hybrid vehicle by using electric power from the battery or electric power generated by the 1 st motor; An internal combustion engine for driving the 1 st motor, and An exhaust gas purifying catalyst provided in an exhaust passage of the internal combustion engine, The driving force of the internal combustion engine is not mechanically transmitted to the driving wheels, In the control method of the hybrid vehicle, When the temperature of the catalyst is equal to or lower than a predetermined temperature, a catalyst temperature increase control is performed to retard the ignition timing of the internal combustion engine, With the above-described catalyst temperature increase control, the ignition timing retard amount when the hybrid vehicle is in a state of vibrating as compared with the vehicle being stopped is increased as compared with the ignition timing retard amount when the vehicle is being stopped.
  2. 2. The control method of a hybrid vehicle according to claim 1, wherein, The state in which the hybrid vehicle vibrates as compared with the state in which the vehicle is stopped means that the vehicle is traveling.
  3. 3. The control method of a hybrid vehicle according to claim 2, wherein, The higher the vehicle speed, the larger the retard amount of the ignition timing of the catalyst temperature increase control.
  4. 4. The control method of a hybrid vehicle according to claim 2 or 3, wherein, The ignition timing of the catalyst temperature increase control is set using a 1 st ignition timing retard amount calculation map that calculates an ignition timing retard amount during vehicle stop, a 2 nd ignition timing retard amount calculation map that calculates an ignition timing retard amount during vehicle running, and a ratio set according to the vehicle speed.
  5. 5. A control device for a hybrid vehicle is provided with: a 1 st motor capable of supplying power generated by power generation to a battery; a2 nd motor that drives drive wheels of the hybrid vehicle by using electric power from the battery or electric power generated by the 1 st motor; An internal combustion engine that drives the 1 st motor; An exhaust gas purifying catalyst provided in an exhaust passage of the internal combustion engine, and A control unit that retards an ignition timing of the internal combustion engine when a temperature of the catalyst is equal to or lower than a predetermined temperature, The driving force of the internal combustion engine is not mechanically transmitted to the driving wheels, In the control device of the hybrid vehicle, The control unit increases the amount of ignition timing retard when the hybrid vehicle is in a state of vibrating as compared with the vehicle being stopped, as compared with the amount of ignition timing retard when the vehicle is being stopped.

Description

Control method for hybrid vehicle and control device for hybrid vehicle Technical Field The present invention relates to a control method of a hybrid vehicle and a control device of a hybrid vehicle. Background For example, patent document 1 discloses a technique of retarding an ignition timing of an internal combustion engine mounted on a hybrid vehicle in order to heat a catalyst for purifying exhaust gas of the internal combustion engine. If the ignition timing is retarded, the combustion stability of the internal combustion engine is deteriorated. If the combustion stability of the internal combustion engine becomes poor, the vibration increases. Therefore, regarding the ignition timing of the internal combustion engine, although for the purpose of heating the catalyst, a limitation is imposed on the retard amount itself from the viewpoint of combustion stability. However, if the vibration of the internal combustion engine is confused with the vibration of the vehicle, the driver is not given an uncomfortable feeling, and the advance of the catalyst heating may be prioritized over the combustion stability of the internal combustion engine. That is, when the ignition timing retard amount for heating the catalyst is set in the internal combustion engine, there is room for further improvement. Patent document 1 Japanese patent application laid-open No. 2014-94691 Disclosure of Invention In the hybrid vehicle according to the present invention, when the temperature of the exhaust gas purifying catalyst provided in the exhaust passage is equal to or lower than a predetermined temperature, catalyst temperature increase control is performed to retard the ignition timing of the internal combustion engine, and the catalyst temperature increase control increases the ignition timing retard amount when the hybrid vehicle is in a state of vibrating as compared with the ignition timing retard amount during the vehicle stop. According to the present invention, the catalyst can be heated as quickly as possible without giving a sense of incongruity to the driver. Drawings Fig. 1 is an explanatory diagram schematically showing a system configuration of a hybrid vehicle to which the present invention is applied. Fig. 2 is an explanatory diagram schematically showing a system configuration of an internal combustion engine 7 mounted on a hybrid vehicle to which the present invention is applied. Fig. 3 is a map of the 1 st ignition timing retard calculation map in which the 1 st ignition timing retard is calculated. Fig. 4 is a map of the 2 nd ignition timing retard amount calculation for calculating the 2 nd ignition timing retard amount. Fig. 5 is a ratio calculation map for calculating a ratio set according to a vehicle speed. Fig. 6 is a flowchart showing a flow of catalyst temperature increase control of the hybrid vehicle. Fig. 7 is a block diagram showing a flow of catalyst temperature increase control of the hybrid vehicle. Detailed Description An embodiment of the present invention will be described in detail below based on the drawings. Fig. 1 is an explanatory diagram schematically showing a system configuration of a hybrid vehicle to which the present invention is applied. The hybrid vehicle includes a drive wheel 1 of the vehicle, a drive motor 2 that rotationally drives the drive wheel 1, an inverter 3 that supplies alternating-current power to the drive motor 2; and a battery 4 and a power generation unit 5 that supply electric power to the inverter 3. The driving motor 2 is used as a driving source to rotationally drive the driving wheel 1. The drive motor 2 corresponds to the 2 nd motor, and is constituted by a synchronous motor using permanent magnets for the rotor, for example. The driving motor 2 is a driving source of the hybrid vehicle, and is driven by ac power from the inverter 3. The drive motor 2 functions as a generator at the time of deceleration of the hybrid vehicle. That is, the drive motor 2 can charge the battery 4 via the inverter 3 with the regenerated energy at the time of decelerating the vehicle as electric power. The inverter 3 is a power conversion circuit that converts electric power generated by the power generation unit 5 and the driving motor 2 into dc electric power and supplies the dc electric power to the battery 4. The inverter 3 is also a power conversion circuit that converts dc power output from the battery 4 into ac power and supplies the ac power to the driving motor 2. The battery 4 is a secondary battery that can be charged with electric power generated by the power generation unit 5 and the driving motor 2 as dc electric power. The battery 4 supplies the charged electric power to the driving motor 2 via the inverter 3. The power generation unit 5 includes a generator 6 as a generator motor, and an internal combustion engine 7 for generating power for driving the generator 6. That is, with respect to the hybrid vehicle to which the present invention is applied, the inter