JPH04370326A - Control device for turbocharger with rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce generation of smoke just after starting and at shift up time succeeding to this starting of a Diesel vehicle by electrically driving a rotary electric machine provided in a turbocharger. CONSTITUTION:A rotary electric machine 3, mounted ona turbocharger 2 of an engine 1, is electrically driven with a battery 6 serving as a power supply to energize pneumatic operation of the turbocharger 2. In this action, current application is continued from a state just before starting till a signal from a car speed sensor 18 reaches a predetermined car speed valve, and a boost pressure is head at a predetermined value or more to reduce generation of smoke at the time of starting and at shift up time succeeding to this starting of a Diesel vehicle.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a turbocharger with a rotating electric machine for reducing smoke in exhaust gas when a diesel vehicle equipped with a turbocharger having a rotating electric machine on its turbine shaft starts.

0002

BACKGROUND OF THE INVENTION In recent years, turbochargers have been widely used to increase the intake pressure of the engine by utilizing energy from the engine's exhaust gas. Various proposals have been made to operate the rotating electric machine electrically or by generating electricity.

For example, in a turbocharger control device proposed by the present applicant in Japanese Patent Laid-Open No. 2-12342, a rotating electrical machine is electrically driven just before the vehicle starts, and the turbocharger is controlled by so-called flying boost-up. BACKGROUND ART It is practiced to start supercharging and increase intake pressure to reduce smoke generation, especially when starting a large truck.

0004

[Problems to be Solved by the Invention] As mentioned above, when the vehicle starts, smoke in the exhaust gas can be reduced by energizing the supercharging operation by the electric drive of the turbocharger with a rotating electric machine. As you shift up, you disengage the clutch and release the accelerator pedal, which causes the turbocharger's rotational speed to drop, and if you engage the clutch again to accelerate, you cannot expect the turbocharger to operate, and the boost pressure decreases. There is a problem that smoke occurs during that time due to the delay in rising.

The present invention was made in view of these problems, and its purpose is to maintain the increase in supercharging pressure even after the flying boost is increased when the vehicle starts, thereby reducing the occurrence of smoke. An object of the present invention is to provide a control device for a turbocharger with a rotating electric machine.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a turbocharger with a rotating electric machine that increases supercharging pressure to an engine by electrically driving a rotating electric machine disposed on the rotating shaft of the turbocharger. The charger control device is provided with boost pressure detection means for detecting the boost pressure and vehicle speed detection means for detecting the vehicle speed, and following an increase in boost pressure just before the vehicle starts due to the electric drive of the rotating electric machine, Provided is a control device for a turbocharger with a rotating electric machine, which is provided with a boost pressure holding control means that continues electric drive of the rotating electric machine and maintains supercharging pressure at a predetermined pressure until a signal from a vehicle speed detection means reaches a predetermined value. .

[0007]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a control device for a turbocharger with rotating electric machine according to the present invention.

In the figure, 1 is an engine, and a turbocharger 2 is connected to an exhaust pipe 11 and an intake pipe 12 of the engine. , and a compressor 22 driven by the torque of the turbine, and the compressor air generated by the operation of the compressor 22 is supplied to the engine 1 as supercharging air through the intake pipe 12.

3 is a rotating electrical machine (TCG) that serves as an electric generator.
), the rotor of which is directly connected to the rotating shaft of the turbine 21. When the exhaust energy from the engine 1 is large, the compressor 22 is driven by the turbine torque to perform supercharging operation, and the rotating electric machine 3 is operated as a generator by driving the rotor, and the exhaust energy is recovered as electrical energy. and charges the vehicle's battery.

Furthermore, when the engine 1 requires rapid acceleration or when the vehicle starts, the rotating electric machine 3 is operated as an electric motor by supplying electric power, and the compressor 22 is driven by the torque to supply pressurized air to the engine 1. , the supercharging pressure can be increased rapidly.

13 is a clutch that connects/disconnects the torque of the engine 1; 14 is a transmission that changes the speed of the torque transmitted through the clutch 13; and the engine 1 has an engine rotation sensor that detects its rotation speed. 15, and the clutch 13 is provided with a clutch sensor 16 for detecting engagement/disengagement of the clutch 13.
A gear position sensor 17 for detecting the gear position and a vehicle speed sensor 18 are attached to the transmission 14, and detection signals from these sensors are respectively input to a controller to be described later. In addition, 19 is a boost pressure sensor that detects the supercharging pressure to the engine 1, and the detection signal is sent to the controller 4.
sent to.

5 is an accelerator pedal and is provided with an accelerator sensor 51 that detects the amount of depression of the pedal; 7 is a brake pedal that is provided with a brake sensor 71 that detects the amount of depression of the pedal; output signals from these are input to the controller 4. connected to the circuit.

Reference numeral 6 denotes a battery, which connects the rotating electric machine 3 during power generation operation.
The power generation output from is stored via the power converter 61,
Further, when the engine 1 suddenly accelerates or the vehicle starts, the electric power from the battery 6 is used to electrically drive the rotating electrical machine 3 and supply pressurized air from the compressor 22 to the engine 1. The power converter 61 is an AC/DC bidirectional converter equipped with an inverter and a converter, and inputs AC power from the rotating electric machine 3 during power generation and converts it into DC power for charging the battery 6. The power of rotating electric machine 3
When supplied to the controller 4, the DC power is converted into predetermined AC power according to a command from the controller 4.

The controller 4 is composed of a microcomputer, and is equipped with a central control unit for performing arithmetic processing, various memories for storing arithmetic processing procedures and control procedures, input/output circuits, etc. The signal line from the sensor is connected.

Then, predetermined arithmetic processing is performed in accordance with the input signal, and based on a control procedure, for example, a power converter 61 is commanded to supply power from the battery 6 to the rotating electric machine 3,
It is configured to energize the supercharging operation of the turbocharger 2 and perform flying boost-up when starting the vehicle.

FIG. 2 is a process flow diagram showing an example of the operation of this embodiment. Next, the operation of this embodiment will be explained using this figure.

In step 1, the engine rotation sensor 15
If it is idling, the signal from the clutch sensor 16 is read in step 2, the signal from the gear position sensor 17 is read in step 3, and the signal from the vehicle speed sensor 18 is read in step 4. If any of the signals is checked between steps 1 to 4, the process moves to step 9, waits for a time, and then returns to step 1. If all steps are satisfied, the process proceeds to step 5, where the counter T, which is the energization time, is set to 1, and in step 6, electric power is supplied from the battery 6 to the rotating electric machine 3 to drive it electrically, and the flying boost is increased. Start.

Next, in step 7, the counter value is set to T+
1, and in step 8 it is checked based on the signal from the vehicle speed sensor 18 whether the vehicle has started, and if the vehicle has not started, the process proceeds to step 10 to check the counter value, and if the counter value T is greater than or equal to a predetermined value Ta. In this case, in step 11, the power to the rotating electric machine 3 is cut off to cancel the flying boost up.

On the other hand, if the vehicle starts at step 8,
In step 12, the rotating electric machine 3 is energized and normal control is started, but when the depression of the accelerator pedal 5 returns to 0 in step 13, the process proceeds to step 14, and when the vehicle speed is less than the predetermined vehicle speed V*, the brake pedal If step 7 is not pressed, the process proceeds to steps 15 and 16, where the electric drive of the rotating electric machine 3 is continued to maintain its rotational speed almost constant, and the supercharging pressure to the engine is controlled so as not to drop below a predetermined value. do.

[0021] Therefore, this control prevents the occurrence of smoke, which causes a delay in boost pressure rise due to upshifting at the time of starting, as described above.

On the other hand, in step 14, the vehicle speed is set to a predetermined value of V*.
If the brake pedal 7 is depressed in step 15 to decelerate, the process advances to step 17, and the rotating electric machine 3
After that, the power supply to the rotary electric machine will be stopped, and the rotating electric machine will then be controlled normally.

Although the present invention has been described above with reference to the above-mentioned embodiments, various modifications can be made within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0024]

[Effects of the Invention] As explained in the above embodiment, according to the present invention, the vehicle speed reaches a predetermined speed even when the accelerator pedal is released after boost pressure is increased by flying boost up when the vehicle starts. Until now, the turbocharger's rotating electrical machine was electrically driven to maintain the supercharging pressure above a predetermined value, which had the effect of reducing smoke during startup and subsequent upshifts. .

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing an embodiment of a control device for a turbocharger with rotating electric machine according to the present invention.

FIG. 2 is a processing flow diagram showing an example of the operation of this embodiment.

[Explanation of symbols]

1...Engine 2...Turbocharger 3...Rotating electric machine 4...Controller 6...Battery 18...Vehicle speed sensor 19...Boost pressure sensor

Claims (1)

[Claims] 1. A control device for a turbocharger with a rotating electrical machine that increases supercharging pressure to an engine by electrically driving a rotating electrical machine disposed on a rotating shaft of the turbocharger, a boost pressure detection means for detecting the supercharging pressure. and a vehicle speed detection means for detecting the vehicle speed, and the electric drive of the rotary electric machine continues until the signal from the vehicle speed detection means reaches a predetermined value following the boost pressure increase immediately before the vehicle starts due to the electric drive of the rotary electric machine. 1. A control device for a turbocharger with a rotating electrical machine, characterized in that a boost pressure maintenance control means is provided to continue the boost pressure and maintain the supercharging pressure at a predetermined pressure.