JP5754409B2 - Vehicle drive device - Google Patents

Description

  The present invention relates to a vehicle drive device, and more particularly to a vehicle drive device in which an internal combustion engine and a generator motor are connected by a belt so that power can be transmitted.

  In a vehicle in which the output shaft of an engine, which is an internal combustion engine, and the rotating shaft of a generator motor are connected by a belt to transmit power, the belt slips when the belt deteriorates, and it is difficult to secure a power generation function by the generator motor. Or power is not properly transmitted from the generator motor to the engine, causing loss. Therefore, in the apparatus described in Patent Document 1, when the rotational speed of the engine and the rotational speed of the generator motor connected to the engine via a belt are detected, the difference between the rotational speeds exceeds a predetermined value. In addition, it warns that the belt has deteriorated. Further, in the apparatus described in Patent Document 2, when the belt tension is lowered, the information is stored in the memory of the ECU in order to inform the repairer such as a dealer of the malfunction.

JP 2003-211995 A JP-A-11-294181

  However, in the apparatus described in Patent Document 2, since the information is stored in the ECU after the belt tension is lowered, there is a problem in that it becomes late to inform the repairer of the malfunction of the belt. .

  The present invention has been made to solve such a problem, and is capable of promptly informing a repairer of information about the possibility of belt deterioration before the belt deterioration occurs. The purpose is to provide.

A vehicle drive device according to the present invention charges an internal combustion engine mounted on a vehicle, a generator motor having a rotary shaft coupled so that power can be transmitted by an output shaft and a belt of the internal combustion engine, and electric power generated by the generator motor. And a control unit having a storage unit, and the control unit detects a rotational speed difference between the internal combustion engine and the generator motor, and the rotational speed difference is set in advance. The control means determines that there is a possibility that the belt may be deteriorated and stores the information in the storage unit when the state is not more than the predetermined value and the state does not continue for a preset predetermined period or longer. .
An alarm means is provided for warning that there is a possibility that the belt may be deteriorated, and the alarm means is provided when the state where the rotational speed difference is not more than a preset predetermined value does not continue for a lower limit period shorter than the predetermined period. Raise an alarm.

  According to this invention, when the rotational speed difference between the internal combustion engine and the generator motor is equal to or less than a predetermined value that is set in advance and the state does not continue for a predetermined time period, the control means By determining that there is a possibility that the belt will deteriorate and storing the information in the storage unit, inform the repairer at an early stage of information on the possibility that the belt will deteriorate before the belt deteriorates. Can do.

It is a figure which shows the structure of the motor vehicle provided with the vehicle drive device which concerns on embodiment of this invention. It is a flowchart for demonstrating operation | movement of the vehicle drive device which concerns on this embodiment.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, an automobile 100 includes an engine 1 that generates gasoline by burning gasoline fuel therein, and a generator motor (MG) 2 that can operate as an electric motor and a generator. One end of the output shaft 3 of the engine 1 is connected to the rotating shaft 4 of the generator motor 2 via a belt 5 and pulleys 6 and 7. Further, the other end of the output shaft 3 of the engine 1 is connected to the axle 10 via a transmission 8 and a differential 9. Further, a rotation speed sensor 16 for detecting the rotation speed Ne of the engine 1 and a rotation speed sensor 17 for detecting the rotation speed Nm of the generator motor 2 are provided. The generator motor 2 and the rotation speed sensors 16 and 17 are each electrically connected to a control unit (ECU) 13 that is a control means. Further, the ECU 13 includes an alarm means 18 for alarming that the belt 5 may be deteriorated, for example, a warning light (not shown) or a buzzer (not shown) provided on the dashboard of the automobile 100. Electrically connected.

  In addition, the automobile 100 includes a power converter 11 and a battery 12. When the DC power output from the battery 12 at the time of starting the engine 1 is converted into AC power by the power converter 11 and supplied to the generator motor 2, the generator motor 2 operates as an electric motor to rotate the rotating shaft 4. The power generated by the driving is transmitted to the engine 1 through the belt 5 and the pulleys 6 and 7. On the other hand, when the rotating shaft 4 of the generator motor 2 is driven by regenerative power from the engine 1 when the automobile 100 is decelerated, the generator motor 2 operates as a generator to generate AC power, and this AC power Is converted into DC power by the power converter 11 and the battery 12 is charged.

As will be described later, the ECU 13 determines the rotational speed difference ΔN between the engine 1 and the generator motor 2 from the rotational speeds Ne and Nm detected by the rotational speed sensors 16 and 17 and the pulley ratio r of the pulleys 6 and 7. (= | Ne−Nm / r |) is calculated. A predetermined value N ₀ for ΔN is stored in advance in a memory 14 that is a storage unit built in the ECU 13. The memory 14 stores in advance two criteria for the duration of the state where ΔN ≦ N ₀ , that is, the lower limit period t ₁ and the predetermined period t ₂ (t ₁ <t ₂ ).

Next, the operation of the vehicle drive device according to the embodiment of the present invention will be described.
When the driver of the automobile 100 starts the engine 1, the control shown in the flowchart of FIG. 2 is started. When the engine 1 is started, the ECU 13 receives a value detected by the rotational speed sensor 16, that is, data of the rotational speed Ne of the engine 1 (step S1), and a detected value by the rotational speed sensor 17, that is, the rotational speed Nm of the generator motor 2. Is received (step S2). Next, the ECU 13 calculates the rotational speed difference ΔN from Ne, Nm, r, and determines whether ΔN> N ₀ (step S3). In the case of ΔN> N ₀ , it is determined that there is a high possibility that the belt 5 will be deteriorated in the near future, or that the deterioration has already occurred, and the warning means 18 is activated (step S4). The dealer informs that the belt 5 needs to be inspected, and ends the control.

On the other hand, if ΔN ≦ N ₀ in step S3, the ECU 13 starts measuring the duration t in the state of ΔN ≦ N ₀ (step S5). In the following step S6, it is determined whether the duration t is greater than the lower limit time t _1. If t <t ₁ , it is determined that there is a high possibility that the belt 5 will be deteriorated in the near future, or the deterioration has already occurred, and the process proceeds to step S4. On the other hand, in step S6, in the case of t ≧ t _1, at the subsequent step S7, determines whether or not the duration t is longer than the predetermined time period t _2. In the case of t ≧ t _2, it is determined that no possibility of degradation occurs in the belt 5, the control is ended. On the other hand, if t <t ₂ in step S7, there is no possibility that the belt 5 will be deteriorated until the next legal inspection, but the belt 5 is not subject to the next legal inspection. ECU 13 determines that there is a possibility of deterioration and informs the dealer of the automobile 100 of the state, and the ECU 13 stores the state of ΔN ≦ N ₀ only for the time t (t ₁ <t <t ₂ ). Information indicating the continuation is stored (step S8), and the control is terminated. Thereby, in the next legal check, the dealer can examine the necessity of replacement of the belt 5.

In order to realize the above-described operation of the vehicle drive device for the predetermined value N ₀ for the rotational speed difference ΔN, the lower limit period t ₁ and the predetermined period t ₂ , the following conditions must be satisfied. That is, the predetermined value N ₀ is a value for determining that there is a high possibility that the belt 5 will be deteriorated in the near future, or that the deterioration has already occurred. The lower limit period t ₁ is a value for determining that the belt 5 is likely to be deteriorated in the near future unless the state of ΔN ≦ N ₀ continues at least for the lower limit period t ₁ . Predetermined time period t _2, even if the state of .DELTA.N ≦ N ₀ is continued longer than the limit time period t _1, unless continues for a predetermined time period t _2, the belt 5 during the 12 months is a period of statutory inspections Although there is no possibility that deterioration will occur, it is a value for determining that there is a possibility that the belt 5 may deteriorate during the 24 months, which is the period until the next legal inspection. These conditions are appropriately set according to the specifications of the engine 1 and the strength of the belt 5.

As described above, when the rotational speed difference ΔN between the engine 1 and the generator motor 2 is equal to or less than the predetermined value N ₀ that is set in advance and the state does not continue for the predetermined time period t ₂ that is set in advance, the ECU 13 Determines that there is a possibility that the belt 5 may be deteriorated, and stores the information in the memory 14, so that information on the possibility of the belt 5 being deteriorated can be obtained before the belt 5 is deteriorated. Can be informed early.

In this embodiment, the condition for setting the predetermined value N ₀ , the lower limit period t ₁ and the predetermined period t ₂ is based on 12 months, which is the period of legal inspection, May be used as a reference. Further, a period shorter than 6 months or longer than 12 months may be used as a reference.

  In this embodiment, the internal combustion engine is an engine 1 that generates gasoline by burning gasoline fuel inside, but may be a diesel engine.

1 engine (internal combustion engine), 2 generator motor, 3 output shaft, 4 rotating shaft, 5 belt, 12 battery, 13 control unit (control means), 14 memory (storage unit), 18 alarm means, 100 automobile (vehicle), Ne (engine) rotational speed, Nm (generator motor) rotational speed, N ₀ predetermined value, ΔN rotational speed difference, t ₁ lower limit period, t ₂ predetermined period.

Claims (2)

An internal combustion engine mounted on the vehicle;
A generator motor having a rotating shaft connected to an output shaft of the internal combustion engine and a belt so as to be able to transmit power;
A battery for charging the power generated by the generator motor and supplying the charged power to the generator motor;
Control means having a storage unit,
The control means detects a rotational speed difference between the internal combustion engine and the generator motor, the rotational speed difference is equal to or less than a preset predetermined value, and the state does not continue for a preset predetermined period or longer. In this case, the control means determines that there is a possibility that the belt is deteriorated, and stores the information in the storage unit. Comprising alarm means for warning that there is a possibility of deterioration of the belt;
The vehicle drive device according to claim 1, wherein the alarm means issues an alarm when the state does not continue for a lower limit period shorter than the predetermined period.

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