Control device of vehicle

Abstract

To provide a control device of a vehicle which can suppress deterioration of emission in controlling of bubbling.SOLUTION: A control device of a vehicle includes a V-type engine and a control part which executes bubbling control which carries out an ignition delay angle in an accelerator-off. The control part determines which of both banks or one bank the bubbling control will be executed in, on the basis of an engine operation point.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a control device for a vehicle. [Background technology]

[0002] Patent Document 1 discloses a technique for retarding ignition timing when the accelerator is released. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-111163 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is a known bubbling control that does not cut fuel when the accelerator is released, but instead significantly retards ignition to create a semi-misfire state, which generates a loud explosion sound. With this bubbling control, unburned fuel is discharged due to the semi-misfire, which worsens emissions.

[0005] The present disclosure has been made in consideration of the above, and has an object to provide a vehicle control device that can suppress deterioration of emissions during bubbling control. [Means for solving the problem]

[0006] The vehicle control device according to the present disclosure includes a V-type engine and a control unit that performs bubbling control by retarding ignition when the accelerator is released, and the control unit determines whether the bubbling control will be performed on both banks or on one bank based on the engine operating point. Effect of the Invention

[0007] According to the present disclosure, it is possible to suppress the deterioration of emissions during bubbling control. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a block diagram showing a schematic configuration of a vehicle to which a vehicle control device according to an embodiment is applied. [Diagram 2] FIG. 2 is a diagram showing an example of a map of engine operating points used when determining whether bubbling control is to be performed on both banks or on one bank in the control device for a vehicle according to the embodiment. [Diagram 3] FIG. 3 is a flowchart showing the flow of a vehicle control method executed by the vehicle control device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A vehicle control device according to an embodiment of the present disclosure will be described with reference to the drawings. Note that components in the following embodiments include those that are easily replaceable by a person skilled in the art, or those that are substantially the same.

[0010] (Vehicle control device) A configuration of a vehicle control device according to an embodiment will be described with reference to Figures 1 and 2. A vehicle to which the vehicle control device according to the embodiment is applied is a vehicle equipped with a V-type engine capable of implementing bubbling control.

[0011] A vehicle 1 to which the vehicle control device according to the embodiment is applied includes at least a control unit 11 and an engine 12, as shown in Fig. 1. Note that, in the figure, only the components essential for implementing the vehicle control device according to the embodiment are extracted from the actual components of the vehicle 1 and illustrated.

[0012] The control unit 11 is an electronic control unit (ECU) whose main components are a microcomputer including a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and the like.

[0013] The control unit 11 is equipped with a control unit that performs bubbling control to retard ignition when the accelerator of the vehicle 1 is released. In this bubbling control, fuel is not cut off when the accelerator is released, but a large ignition retard is performed to create a semi-misfire state, generating a loud explosion sound.

[0014] The engine 12 is a V-engine having two rows of cylinders (hereinafter referred to as "banks").

[0015] Here, with bubbling control, unburned fuel is discharged due to semi-misfire, which worsens emissions. Also, in the engine 12, the control is activated simultaneously on both banks, which causes semi-misfires in each bank.

[0016] Therefore, the control unit 11 determines whether the bubbling control is to be performed on both banks or on one bank based on the engine operating point. Here, Fig. 2 shows an example of a map of engine operating points used when the control unit 11 determines whether the bubbling control is to be performed on both banks or on one bank. In the figure, the vertical axis is engine torque TQ [Nm], and the horizontal axis is engine speed NE [rpm].

[0017] As shown in Fig. 2, when the engine operating point is at high revolutions and high load, the amount of exhaust gas increases, but the effect of bubbling decreases. In addition, since the catalyst temperature is expected to be high, the purification performance of the catalyst also increases. Therefore, when the engine operating point is at high revolutions and high load, the control unit 11 performs bubbling control on both banks. When the engine operating point is at high revolutions and high load, the purification performance of the catalyst is high, so sufficient purification can be expected even if bubbling control is performed on both banks.

[0018] On the other hand, as shown in Fig. 2, when the engine operating point is at low revolutions and low load, the amount of exhaust gas is small. In addition, since the catalyst temperature is expected to be low, the purification performance of the catalyst is also low. Therefore, when the engine operating point is at low revolutions and low load, the control unit 11 performs bubbling control on one bank. When the engine operating point is at low revolutions and low load, the purification performance of the catalyst is low, so by performing bubbling control on one bank, it is possible to suppress the deterioration of emissions.

[0019] In this way, in the vehicle control device of the embodiment, by performing bubbling control on either both banks or one bank based on the engine operating point, it is possible to suppress deterioration of emissions during bubbling control.

[0020] (Vehicle control method) The flow of a vehicle control method executed by the vehicle control device according to the embodiment will be described with reference to FIG.

[0021] First, the control unit 11 judges whether or not a preset condition for implementing bubbling control is satisfied (step S1). If it is judged in step S1 that the condition for implementing bubbling control is satisfied (Yes in step S1), the control unit 11 judges whether or not "the engine speed NE is equal to or greater than [A] rpm and the engine torque TQ is equal to or greater than [B] Nm" (step S2). If it is judged in step S1 that the condition for implementing bubbling control is not satisfied (No in step S1), the control unit 11 ends this process.

[0022] Here, the determination in step S2 can be made based on, for example, the map shown in Fig. 2. That is, the values ​​of [A] and [B] can also be determined based on the map shown in the same figure.

[0023] In step S2, if it is determined that "the engine speed NE is equal to or greater than [A] rpm and the engine torque TQ is equal to or greater than [B] Nm" (Yes in step S2), the control unit 11 performs bubbling control in both banks (step S3) and completes this process. On the other hand, if it is determined in step S2 that "the engine speed NE is not equal to or greater than [A] rpm and the engine torque TQ is not equal to or greater than [B] Nm" (No in step S2), the control unit 11 performs bubbling control in one bank (step S4) and completes this process.

[0024] In the vehicle control device according to the embodiment described above, the bubbling control is performed on either both banks or one bank based on the engine operating point, thereby making it possible to suppress deterioration of emissions during bubbling control.

[0025] Further advantages and modifications may readily occur to those skilled in the art. Thus, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof. [Explanation of symbols]

[0026] 1 vehicle 11 Control section 12 Engine

Claims

[Claim 1] A V-type engine, A control unit that performs bubbling control to perform ignition retardation when the accelerator is released; Equipped with The control unit determines whether the bubbling control is to be performed on both banks or on one bank based on an engine operating point. Vehicle control device.

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