JP3464776B2 - Control device for hybrid vehicle - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for engine inspection of a hybrid vehicle.

[0002]

2. Description of the Related Art A hybrid drive system using an engine and a motor together is known as a drive system for a vehicle. In this drive system, a drive mode such as motor drive only, engine drive only, or motor and engine drive is used. When the motor generator that charges the battery is driven by the engine and the charge capacity of the battery is large, the engine is stopped.

By the way, there is an inspection device for inspecting whether the operating state of each part of the vehicle engine is proper. The inspection device is connected to the engine controller to measure, for example, the ignition timing of the engine. , Read the stored engine failure status.

The engine of the hybrid vehicle may stop depending on the state of charge of the battery as described above.
Therefore, if the engine is stopped during the inspection, the inspection cannot be performed. Therefore, according to Japanese Patent Laid-Open No. 10-339183, when it is determined that the engine is being inspected, control is performed so as not to stop the engine regardless of the remaining battery capacity, that is, even when the battery charge amount is sufficient, and the inspection is surely performed. Suggestions have been made to make it possible.

[0005]

However, in the above device, even if the stop during the engine inspection is avoided, the engine torque is increased and the battery is charged when the battery is insufficient.

As one of engine inspections, Japanese Patent Laid-Open No.
There is rapid (idle air amount adjustment) learning as disclosed in Japanese Patent No. 182304, and in order to eliminate variations in the idle speed, this rapid learning is performed so that the engine speed is constant and the idle speed is constant. Is adjusted and learned and saved, but at the time of this learning, it is necessary to accurately control the engine shaft torque to be constant, and if the engine shaft torque fluctuates from the battery charging request at this time, inspection becomes impossible. turn into.

In addition, as an active test of the engine, the engine is rotated at a constant axial torque, the ignition timing and the exhaust gas recirculation amount are changed, and the change in the engine speed at this time is read to determine the ignition timing control device and Although it may be inspected whether or not the exhaust gas recirculation control device is operating properly, in this case as well, if there is a change in the engine output due to the above-described battery charging request, the inspection cannot be performed immediately.

An object of the present invention is to solve such a problem, that is, to eliminate the factor of fluctuation of the engine output during the engine inspection and to guarantee an accurate engine inspection.

[0009]

A first aspect of the present invention is a hybrid vehicle including an engine, a motor, and a motor generator that is driven by the engine and generates electric power so that a battery charge amount reaches a predetermined value. And a means for forcibly charging the battery to a predetermined charge amount when the inspection request is determined.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided means for inhibiting charging of the battery during the engine inspection.

A third aspect of the present invention is the engine control system according to the first or second aspect, wherein an engine inspection request is executed by a signal from an inspection device connected to the engine controller, while keeping the engine shaft torque constant. This is rapid learning in which the amount of idle air required to maintain a predetermined idle target speed is determined and learned.

In a fourth aspect based on the first or second aspect, an engine inspection request is executed by a signal from an inspection device connected to an engine controller, while maintaining a constant engine shaft torque, It is an active test that changes the engine device that causes fluctuations in the engine operating characteristics.

In a fifth aspect based on the fourth aspect, there is provided means for feedback-controlling the output of the motor generator so that the engine speed becomes constant when the engine is rotated at a constant axial torque. , Engine torque fluctuations are detected based on the output of the motor generator.

According to a sixth aspect of the present invention, in the first to fifth aspects, when the engine inspection permitting condition is not satisfied during the engine inspection, the constant engine shaft torque control is stopped and the normal control is resumed.

In a seventh aspect of the invention, the engine inspection permission condition is that the vehicle speed is zero, the transmission is in the P range, the battery charge amount is within the allowable range, and the engine cooling water temperature is within the allowable range. This is when the controller has not determined an abnormality.

[0016]

In the first aspect of the invention, a sufficient amount of charge is secured by the rapid charging of the battery that is performed in advance during the engine inspection, and the battery charging request is less likely to occur during the inspection. Therefore, the engine can be stably operated with a constant axial torque during the inspection, and the engine can be accurately inspected.

In the second aspect of the present invention, charging of the battery is prohibited during the engine inspection, so that there is no cause of fluctuation of the engine output during the inspection, and accurate inspection is guaranteed.

In the third aspect of the invention, rapid learning for compensating for variations in idle speed is used, and in the fourth aspect of the invention, EGR is performed.
You can inspect engine devices such as control devices and ignition timing control devices.

According to the fifth aspect of the invention, when the engine torque fluctuates due to the operation of the engine device, the output of the motor generator changes. For example, when the engine device works on the torque down side, the output torque of the motor generator changes. When the engine device works to increase the torque, and conversely the engine device works to increase the torque, the output torque of the motor generator decreases, which makes it possible to confirm the operation of the engine device accurately and easily.

In the sixth and seventh inventions, when the predetermined engine inspection permission condition is not satisfied, proper inspection cannot be performed. Therefore, the inspection mode operation in which the engine shaft torque is constant is stopped, and the inspection result is unsatisfactory. Prevent it from becoming accurate.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

Referring first to FIG. 1, a power train of a hybrid vehicle will be described. A motor (motor generator) 1, an engine 2, a powder clutch (hereinafter simply referred to as a clutch) 3, a motor 4, a transmission (including a continuously variable transmission). ) 5, a differential gear 6, and a drive wheel 7. The output shaft of the motor 1, the output shaft of the engine 2 and the input shaft of the clutch 3 are connected to each other, and the output shaft of the clutch 3 is
The input shaft of the motor 4 and the input shaft of the transmission 5 are connected to each other.

When the clutch 3 is engaged, the engine 2 and the motor 4 are drive sources for the vehicle, and when the clutch 3 is disengaged, only the motor 4 is a drive source. Motor 1 is mainly engine 2
The motor 4 is mainly used for energy recovery during traveling and deceleration of the vehicle.

The motors 1 and 4 are each driven by an inverter (not shown). It is connected to the high-voltage battery 15 via a DC link common to the inverters, and the direct-current power of the high-voltage battery 15 is converted into alternating-current power to drive the motors 1, 4
And the AC power generated by the motors 1 and 4 is converted into DC power to charge the high voltage battery 15.

Reference numeral 20 denotes a hybrid controller (HCM) having the hybrid control function of the present invention. The engine cooling water temperature, the shift position from the transmission, the accelerator and brake operation amounts are input, and the engine speed and the vehicle speed are set. The state of charge from the high voltage battery 15 is also input, and based on these, the motor control circuit 21,
Engine control circuit (ECM) 22, clutch control circuit 2
3. Control each operation of the motor control circuit 24 and the transmission control circuit 25.

In the figure, 30 is an engine cooling water temperature sensor, 3
1 is a transmission select lever switch, 32 is an accelerator sensor, 33 is a brake switch, 34 is a vehicle speed sensor,
Reference numeral 35 is a throttle opening sensor, 36 is an idle switch, 37 is an engine speed sensor, and 38 is a battery SO.
It is a C detector. The battery SOC detection device 38
Detects a representative value of the actual capacity (charge amount) of the high voltage battery 15.

Next, referring to FIG. 2, an inspection system for performing rapid learning for compensating for variations in the idle speed of the engine 2 of such a hybrid vehicle and an active test of the engine device will be described.

The inspection device (consult) 41 is directly connected to the engine control circuit (ECM) 22 described above, and various instruction signals for inspection can be input. ECM22
And the hybrid controller (HCM) exchange signals by CAN communication, and when an inspection request is issued from the inspection device 41, a signal is output from the ECM 22 to the HCM 20.
Is output to the engine, the engine is started based on this, and the engine drive conditions are adjusted according to the contents of the subsequent inspection.
It is sent to M22 and the operation of the engine 2 is controlled.

When the HCM 20 makes an inspection request, the high-voltage battery 15 is irrespective of the battery charge amount.
The engine speed is increased so as to forcibly perform rapid charging for a certain period of time. During normal charging, the engine 2 is rotating at 1000 rpm, for example, but during rapid charging, the rotation speed is increased to 1200 rpm, which increases the charging amount of the high-power battery 15 to the state where charging is unnecessary during inspection. It is like this.

Further, the ECM 22 is controlled during the inspection in accordance with an instruction from the inspection device 41, the engine shaft torque is kept constant, and the output torque of the motor generator 1 is changed with respect to the change of the engine speed due to the engine load change. Feedback control is performed to maintain a constant rotational speed, and in this state, rapid control is performed to compensate for variations in idle rotational speed, and active tests are performed on the operating status of engine devices such as the EGR device and ignition timing device. . Then, the inspection result is determined by detecting the output fluctuation of the motor generator 1.

Specific control operations will be described with reference to FIGS.
It will be described in accordance with the flowchart of.

FIG. 3 shows a control operation executed on the HCM side. First, in step S1, it is judged whether or not an inspection mode trigger is input. If there is an input, the transmission gear position at that time is in the P range, Also, it is determined whether or not the minimum charge amount of the battery is satisfied. When these conditions are met, the motor generator 1 and the E
A high-power charging request is issued to the CM 22. This is for example
The engine speed is raised above the normal speed so that the engine speed becomes 1200 rpm, and the motor generator 1 generates electric power.

In step S4, it is determined whether the SOC corresponding to the charge amount of the high voltage battery 15 sent from the HCM 20 via the CAN has reached a predetermined charge amount, and rapid charging is performed until the SOC reaches the predetermined charge amount.

If the predetermined charge amount is reached, step S5
Then, the inspection mode operation command is issued to the motor generator 1 and the ECM 22. At this time, the engine speed is controlled to the idle operation mode of 1000 rpm, the generated torque of the motor generator 1 is set to zero Nm, and the engine shaft torque is kept constant. The clutch 3 is disengaged and the motor 4 is stopped.

This inspection mode operation is maintained until the inspection mode described later is completed. That is, in step S6, it is determined whether or not a problem has occurred in the system and the charge amount, and if there is no problem, it is determined in step S7 whether or not the inspection end signal has been input, until there is an end signal.
The inspection mode described above is maintained.

Here, the above-mentioned problems are that the vehicle speed is 0 km / h or more, the transmission is at a position other than the P range, and the battery charge amount is 3
5% or less or 75% or more, engine cooling water temperature is 50 ° C
Below or above 110 ° C, motor control circuits 21 and 2
4, when the NG occurs in the HCM 20, and in such a case, the process proceeds to step S8, the normal operation mode is entered, and a command is issued to start the normal hybrid control system.

Next, the control operation executed on the ECM side will be described with reference to FIG.

First, in step S11, it is determined whether an active test or rapid learning trigger signal is input.
When input, the transmission gear position, vehicle speed, engine cooling water temperature, etc. are determined at step S12, the gear position is in the P range, the vehicle speed is zero, and the cooling water temperature is from 50 ° C to 10 ° C.
If it is at ℃, step S to shift to the inspection mode.
Proceed to 13. Here, the inspection mode is activated and the HCM2
Send test mode signal to 0. In step S14, it is determined whether or not there is a high-power charge control request, and wait until there is,
If there is a request, the engine is started in step S15, the idle speed is maintained at 1200 rpm, and high-power charging control is executed.

This high-power charging is continued until the inspection mode operation command is detected in step S16, that is, until the charge amount reaches a predetermined value. If there is an inspection mode command, the process proceeds to step S17 and the engine is operated so that the idle shaft rotation speed is 1000 rpm and the shaft torque is constant.
Perform active test control.

Until it is determined in step S18 that these active tests and rapid learning have ended, step S17
The inspection mode in is continued.

When the end is judged, step S
The inspection mode end signal is transmitted in step 18, and step S2
The operation proceeds to 0 and returns to the normal operation mode.

FIG. 5 shows the control operation of the above-described rapid learning. In step S31, the engine speed and the air amount at this time are combined and stored as a learning value while the engine shaft torque is kept constant. As a result, the rotational speed during idle operation can be corrected to match the target idle rotational speed.

FIG. 6 shows the control operation of the active test.

In step S41, each engine device such as an EGR device and an ignition timing control device is operated by an active test.

In step S42, the output of the motor-generator 1 absorbs the engine torque fluctuations caused by the operation of these engine devices and the rotational speed fluctuations accordingly. When the engine device goes to the torque down side, the motor torque is increased (plus side), and conversely, the motor torque is decreased to the torque up side (minus side), whereby the engine speed is kept constant. For example, when the EGR gas flow rate is increased, the engine torque is reduced and the rotation speed is reduced. Therefore, the motor torque is increased to compensate for this.

Therefore, by detecting the output change of the motor generator 1, the torque fluctuation of the engine can be detected and the active test can be performed.

Next, the overall operation will be described.

When testing the operation of various devices of the engine 2 or performing learning control for making the idle speed converge to a target value, the inspection device 22 is connected to the ECM 22.
When the inspection request is issued, the engine is started, the rotation speed thereof is controlled to 1200 rpm which is higher than the normal idle rotation speed, and the motor generator 1 generates electric power to rapidly charge the high power battery 15 with high power. This is because the amount of power generation is larger than that during normal charging, and the amount of charge of the high voltage battery 15 reaches a predetermined value in a short time.

As a result, while the rapid learning and the active test are being performed, the charge capacity of the high voltage battery 15 is sufficiently secured, the battery voltage drops during the inspection, and the engine 2 is charged so that the charging is performed. Therefore, it is possible to prevent the inspection from being confused by the fluctuation of the engine output.

After the high-power battery 15 is charged, the mode is shifted to the inspection mode and the engine shaft torque is constant,
The rotation speed is maintained at a constant rotation speed of 1000 rpm, for example.
The feedback control is performed to suppress the fluctuation by the output of.

When the active test is performed in this state and, for example, the EGR amount by the EGR device is increased, the engine torque is reduced and the engine speed tends to be reduced. However, when a decrease in the rotational speed is detected, the output of the motor generator 1 increases (on the positive side) and returns to the target idle rotational speed. Conversely, when the EGR amount decreases and the engine torque increases, the rotational speed becomes higher than the target rotational speed. Trying to rise,
On the other hand, the output of the motor generator 1 decreases (minus side), and the rotation speed is maintained at the target value.

Since the output torque of the motor generator 1 changes in this way, by detecting this,
It is possible to judge whether the EGR device is operating properly.

By the way, when the engine is inspected, for example, when the transmission is switched from the P range to the D range or the vehicle speed is no longer zero, the inspection permission condition is lost and an accurate inspection cannot be guaranteed. , Stop the inspection mode and return to normal engine control. In addition, in addition to this, when the battery charge amount is out of the range of 35% to 75% and there is a possibility of overcharging or when the engine cooling water temperature is out of the range of 50 ° C to 110 ° C, The inspection is stopped even when the engine 2 is unstable,
It prevents problems from occurring when the inspection continues.

In the inspection mode, it is possible to prohibit high-power charging of the high-power battery 15 even if the battery charging state fluctuates to some extent. In this case, the battery charging is performed during constant control of the engine shaft torque. Therefore, the reliability of the inspection result is not impaired, and accurate inspection can be performed.

It is obvious that the present invention is not limited to the above-mentioned embodiments and various modifications can be made within the scope of the technical idea.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of the present invention.

FIG. 2 is a block diagram of the engine inspection system of the same.

FIG. 3 is a flowchart of control operation.

FIG. 4 is a flowchart of the same.

FIG. 5 is a flowchart of the same.

FIG. 6 is a flowchart of the same.

[Explanation of symbols]

1 motor generator 2 engine 3 clutch 4 motor 5 transmission 20 Control circuit (HCM) 22 Engine control circuit (ECM) 41 Inspection device

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI B60K 6/04 731 B60K 6/04 731 F02D 29/02 F02D 29/02 L ZHV ZHVD 29/06 29/06 GN 41/16 41/16 GP 45/00 312 45/00 312T G01M 15/00 G01M 15/00 Z (72) Inventor Yoshikuni Kurashima 2520 Takaba, Hitachinaka-shi, Ibaraki Hitachi (72) Inventor Akasaka Nobuhiro 2520 Takaba, Hitachinaka City, Ibaraki Prefecture, Hitachi, Ltd. (72) Inventor Yoshihiko Akagi 2477, Takaba, Hitachinaka City, Ibaraki Prefecture, Hitachi Car Engineering Co., Ltd. (56) References JP-A-10-339183 A) JP-A-11-182304 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60K 6/02-6/04 B60L 11/00-11/18 F02D 29/00- 29/06 F0 2D 45/00 G01M 15/00

Claims (7)

(57) [Claims] 1. A hybrid vehicle including an engine, a motor, and a motor generator that is driven by the engine to generate electric power so that a battery charge amount reaches a predetermined value, and means for determining an inspection request when inspecting the engine. A control device for a hybrid vehicle, comprising: means for forcibly and rapidly charging a battery to a predetermined charge amount when an inspection request is determined. 2. The control device for a hybrid vehicle according to claim 1, further comprising means for prohibiting charging of a battery during the engine inspection. 3. An idle air required for maintaining a predetermined idle target rotational speed while maintaining a constant engine shaft torque, in which an engine inspection request is executed by a signal from an inspection device connected to an engine controller. The control device for a hybrid vehicle according to claim 1 or 2, which is rapid learning for determining and learning an amount. 4. An engine inspection request is executed by a signal from an inspection device connected to an engine controller, and active for changing an engine device that causes fluctuations in engine operating characteristics while maintaining a constant engine shaft torque. The control device for a hybrid vehicle according to claim 1 or 2, which is a test. 5. A means for feedback-controlling the output of the motor generator so that the number of rotations of the engine is constant when the engine is rotated with a constant axial torque, and the torque fluctuation of the engine is output by the motor generator. The control device for a hybrid vehicle according to claim 4, wherein the detection is performed based on 6. When the engine inspection permission condition is not satisfied during the engine inspection, the engine axial torque constant control is stopped,
The control device for a hybrid vehicle according to claim 1, wherein the control device returns to normal control. 7. The engine inspection permission condition is that the vehicle speed is zero, the transmission is in the P range, the battery charge amount is within the allowable range, and the engine cooling water temperature is within the allowable range.
The control device for a hybrid vehicle according to claim 6, which is when the controller does not determine an abnormality.