JPH07266912A - Brake energy regeneration device of vehicle - Google Patents

Brake energy regeneration device of vehicle

Info

Publication number
JPH07266912A
JPH07266912A JP5783394A JP5783394A JPH07266912A JP H07266912 A JPH07266912 A JP H07266912A JP 5783394 A JP5783394 A JP 5783394A JP 5783394 A JP5783394 A JP 5783394A JP H07266912 A JPH07266912 A JP H07266912A
Authority
JP
Japan
Prior art keywords
brake
pressure
outside air
detecting
air temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5783394A
Other languages
Japanese (ja)
Inventor
Akinobu Kadoi
Kazutomi Tanaka
一臣 田中
明伸 門井
Original Assignee
Nissan Diesel Motor Co Ltd
日産ディーゼル工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Diesel Motor Co Ltd, 日産ディーゼル工業株式会社 filed Critical Nissan Diesel Motor Co Ltd
Priority to JP5783394A priority Critical patent/JPH07266912A/en
Publication of JPH07266912A publication Critical patent/JPH07266912A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent generation of a shock, etc., at the time of rake changeover and to make brake feeling favourable by constituting a brake device to set a specified value of car speed to be a standard to reset the brake device by way of varying it by stopping collection of brake energy in accordance with outside air temperature or brake temperature. CONSTITUTION:Outputs of an acceleration sensor 51 to detect an operating amount of an accelerator pedal, a brake pressure sensor 37 as a working pressure detection means to detect brake pressure Pb by the operating amount of the brake pedal 30, an outside air temperature sensor 57 as an outside air temperature detection means to detect outside air temperature, a car speed sensor 53 as a car speed detection means to detect car speed V, a shift sensor 54 to detect a position of a shift lever in accordance with actuation of a transmission control device and a pressure accumulation sensor 55 to detect a pressure accumulation level L of a high pressure accumulator 29 are input to a regeneration brake control device A controlling a solenoid valve 40, and they are output to the solenoid valve 40, a hydraulic pump motor 27 and a cutoff valve 56.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle brake energy regenerator for recovering kinetic energy when the vehicle is decelerated and using it as drive energy, and more particularly to a brake such as a service brake after stopping recovery of brake energy. The present invention relates to a technique for controlling return of the device.

[0002]

2. Description of the Related Art Conventionally, as this type of brake energy regeneration device, those disclosed in, for example, Japanese Utility Model Laid-Open No. 121371/1990 and Japanese Patent Laid-Open No. 4-212845 are known. These devices are configured as shown in FIG. 5, and the outputs of the brake switch 2 that is turned on / off according to the depression of the brake pedal 1 and the output of the sensor 3 that detects the depression angle thereof are input to the control device 4. .

This control device 4 uses a pump motor 7 via an electromagnetic clutch 6 to a PTO output device 5 which uses the stored pressure of deceleration energy when the brake pedal 1 of the vehicle is depressed as starting and acceleration energy of the vehicle. A high pressure side accumulator 9 and a low pressure side accumulator 10 are connected to the pump motor 7 via a circuit valve 8.

In this vehicle brake energy regeneration system, when the brake pedal 1 is stepped on, the air from the air tank 11 is supplied to the brake cylinder 12 by the outputs of the brake switch 2 and the sensor 3, and the brake shoe 13 is released.
Comes into contact with the brake drum 14 and brakes the vehicle. At the same time, the electromagnetic clutch 6 is brought into contact with the output of the control device 4, so that the rotation of the PTO output device 5 to which the rotation of the wheel 15 is transmitted is transmitted to the pump motor 7 to rotate the pump motor 7 to rotate the low pressure accumulator. The pressure in 10 is increased and sent to the high pressure accumulator 9.

In the case of starting or accelerating the vehicle, the control device 4 controls the circuit valve 8 by the pressure detected by the sensor 16 which detects the pressure in the high pressure side accumulator 9 so that the inside of the high pressure side accumulator 9 is controlled. The PTO output device 5 is rotated by allowing the pressure of 6 to flow into the low pressure side accumulator 10, but the wheel 15 is driven because the electromagnetic clutch 6 is in contact at this time.

[0006]

In such a conventional brake energy regeneration device, the vehicle speed is set to a predetermined value as a condition for stopping the recovery of the brake energy and returning the normal brake device such as a service brake. The condition is when the following occurs. On the other hand, a normal brake device such as a service brake has a different braking condition depending on the temperature of the brake system. Therefore, in the conventional configuration, the normal brake device such as the service brake is restored at a predetermined vehicle speed. Depending on the warm-up state of the system, a shock or the like may occur when switching the brakes, resulting in a bad brake feeling.

The present invention has been made in view of the above, and a predetermined vehicle speed as a reference for stopping recovery of brake energy based on the outside air temperature or the brake temperature related to the braking condition of the brake and returning the brake device. By changing the value and setting it, it is an object to prevent a shock or the like from occurring at the time of switching the brake and to improve the brake feeling.

[0008]

Therefore, according to the first aspect of the invention, when the brake device of the vehicle is operated, the pump motor is driven by the rotational force of the wheel drive system so that the oil in the low pressure side accumulator is moved to the high pressure side. In a vehicle brake energy regenerative device adapted to recover brake energy by pumping pressure to an accumulator and accumulating the pressure, operating pressure detection means for detecting an operating pressure of the brake device, vehicle speed detection means for detecting a vehicle speed, and the vehicle speed. Based on the detection signal output from the detection means, when the vehicle speed is equal to or lower than a predetermined value, based on the signal output from the operation pressure detection means to stop the recovery of the brake energy and restore the operation of the brake device. Control means for driving the brake device according to operating pressure, outside air temperature detecting means for detecting the outside air temperature, and the outside air temperature detecting means. And the predetermined value setting means of the vehicle speed to be set by varying the predetermined value of the vehicle speed which is a collection discontinuation of reference of the brake energy on the basis of a detection signal outputted from the means,
It was composed including.

According to a second aspect of the present invention, instead of the outside air temperature detecting means, a brake temperature detecting means for detecting a brake temperature is provided, and the brake energy of the brake energy is detected based on a detection signal output from the brake temperature detecting means. The configuration is such that the predetermined value of the vehicle speed that serves as the reference for the collection suspension is variably set. According to the third aspect of the present invention, the vehicle speed setting means sets the predetermined value of the vehicle speed to be lower as the outside air temperature or the brake temperature is higher.

[0010]

According to the first aspect of the invention, when the vehicle speed is equal to or lower than the predetermined value, the recovery of the brake energy is stopped and the service brake is restored. Then, for example, as in the invention of claim 3, the higher the outside air temperature (the brake temperature in the invention of claim 2) is, the lower the predetermined value of the vehicle speed is set. The brake switching point can be changed, so that shock or the like does not occur at the time of switching the brake, and the brake feeling can be improved.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 shows a brake pipe of a vehicle according to an embodiment of the present invention. The brake pedal 30 is provided with a primary brake valve 32 and a secondary brake valve 33 that open according to the depression of the brake pedal 30, and are linked to these. A brake valve 34 for regenerative braking is provided.

Each brake valve 32, 33 and 34 has a
Brake piping 35, 41, 3 from the air reservoir tank
6 is connected, and a regenerative brake control pressure pipe 38 is connected from the regenerative brake brake valve 34 to the regenerative brake operation command pressure sensor 37. A normally open solenoid valve 40 that closes only when energized is provided in the communication passage 39 that branches from the regenerative brake control pressure pipe 38.

On the other hand, the secondary brake valve 33 is connected with the primary pressure pipe 41 from the air reservoir tank, and the secondary pressure pipe 43 and the primary brake valve from the secondary brake valve 33 to the booster (or brake chamber) 42. In the middle of the primary pressure pipe 44 from 32 to the booster 42 ', branch communication passages 45, 46 from the solenoid valve 40 are connected by double check valves 47, 48.

A pipe to a brake switch 49 for controlling the transmission for supplying an input signal to the transmission control device 21 is branched from the middle of the primary pressure pipe 44. In the figure, 50 and 51 are brake lamp switches, and the piping to them is the secondary pressure piping 4
3. The brake lamp is lit by branching from the primary pressure pipe 44 and increasing the pressure in the secondary pressure pipe 43 and the primary pressure pipe 44 during braking.

The regenerative braking control device A for controlling the solenoid valve 40 includes an accelerator pedal 31 as shown in FIG.
An accelerator sensor 51 for detecting the amount of depression of the brake pedal, a brake pressure sensor 37 as an operating pressure detecting means for detecting the brake pressure Pb depending on the amount of depression of the brake pedal 30, an outside air temperature sensor 57 as an outside air temperature detecting means for detecting an outside air temperature, A vehicle speed sensor 53 as a vehicle speed detecting means for detecting a vehicle speed V, a shift sensor 54 for detecting the position of a shift lever based on the operation of the transmission control device 21, and a pressure accumulation sensor 55 for detecting a pressure accumulation level L of the high pressure accumulator 29.
Output is input to the solenoid valve 40, the hydraulic pump motor 2
7. Output to the shutoff valve 56.

Regarding the output pressure characteristics of the brake valves 32, 33, 34, only the regenerative brake control pressure Pb rises during the initial depression angle (θ <θ 1 ). The regenerative brake control device A operates according to the flowchart of FIG. 3, and when the energy recovery mode starts in step S1, the brake pressure sensor 52 operates in step S2.
The brake pressure Pb is input.

Then, in step S3, the brake pressure Pb is compared with the predetermined pressure P 0. If the brake pressure Pb is larger than P 0 , step S4 is performed.
In step S5, the pressure accumulation level L is read and the pressure accumulation level L is compared with the maximum pressure accumulation level L max . As a result, if the pressure accumulation level L is smaller than the maximum pressure accumulation level L max , step S
6, it is determined whether or not the shift position of the shift sensor 54 is forward, and if forward, step S
7, the outside air temperature T by the input of the outside air temperature sensor 57
Read 1 In step S8, the vehicle speed V 1 at which the recovery of the brake energy is stopped and the service brake functioning as the brake device is restored is set based on the read outside air temperature T 1 . In this case, as shown in the map of FIG. 4, a map in which the vehicle speed V is assigned by the outside air temperature T is provided in advance, and the vehicle speed V 1 corresponding to the outside air temperature T 1 at that time is read by referring to this map. . Step S
At 9, the vehicle speed V input by the vehicle speed sensor 53 is read. In step S10, the detected vehicle speed V and the set vehicle speed V are set.
If the detected vehicle speed V is equal to or higher than the set vehicle speed V 1 , the shutoff valve 56 is opened in step S11, and the tilt angle of the hydraulic pump motor is set to the brake pressure Pb and the pressure accumulation level L in step S12. The tilt angle on the pump side is controlled according to the vehicle speed V.

Then, in step S13, the solenoid valve 4
0 is energized and it is closed, so that the initial step angle (θ <
During θ 1 ), only regenerative braking is activated. Step S3, Step S5, Step S6, Step S
In 10, when the condition other than the above (regenerative brake invalid condition), the process proceeds to step S14 and the solenoid valve 4
0 is released, so that the service brake pressure (primary or secondary pressure) rises to the level of the pressure Pb introduced through the double check valves 47 and 48 even during the initial depression angle (θ <θ 1 ). After that, after the tilt angle = 0 in step S15, the shutoff valve 56 is closed in step S16.

After the end of steps S13 and S16, the energy recovery mode is ended (return to the main routine). As described above, during the initial stepping angle (θ <θ 1 ) of the brake pedal 30, when the condition for the regenerative brake is valid, the regenerative brake is operated in step S12 of the flowchart, and in step S13. , The solenoid valve 40 is closed and the service brake is deactivated.

However, in step S3, step S5, step S6, step S10, when the regenerative brake invalid condition is satisfied, the solenoid valve 40 is opened, so that the control pressure Pb is the solenoid valve 40 and the double check valve 4.
Primary and secondary pressure piping 4 through 7, 48
Since it flows to Nos. 4 and 43, the braking force can be obtained according to the depression amount of the brake pedal 30 even during the initial depression angle (θ <θ 1 ).

According to such a configuration, when the vehicle speed is less than or equal to the predetermined value, the predetermined value of the vehicle speed is set lower as the outside air temperature is higher in the structure in which the recovery of the brake energy is stopped and the operation of the service brake is restored. Therefore, the brake switching point can be changed depending on the warm-up state of the brake system, and shock etc. does not occur during brake switching,
Brake feeling can be improved.

In the above embodiment, the predetermined value of the vehicle speed, which is the reference for stopping the collection of the brake energy, is variably set based on the outside air temperature, but the brake energy is collected based on the brake temperature. It is also possible to adopt a configuration in which a predetermined value of the vehicle speed that serves as a reference for suspension is variably set.

[0023]

As described above, according to the first aspect of the present invention, when the vehicle speed is less than the predetermined value, the braking operation is stopped so as to stop the recovery of the braking energy and restore the operation of the braking device such as the service brake. In a device that drives a brake device in accordance with a pressure, an outside air temperature is detected, and a predetermined value of a vehicle speed that serves as a reference for stopping recovery of brake energy is determined based on the detected outside air temperature (brake temperature in the invention of claim 2). Since it is configured to be variably set (the higher the outside air temperature or the brake temperature is, the lower the predetermined value of the vehicle speed is set like the invention according to claim 3), the brake switching point is changed depending on the warm-up state of the brake system. As a result, a shock or the like does not occur at the time of switching the brakes, and the brake feeling can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a vehicle brake energy regeneration device according to the present invention.

[Fig. 2] Piping diagram of the above embodiment

FIG. 3 is a flowchart illustrating the control contents of the above embodiment.

FIG. 4 is a map showing the relationship between outside air temperature and vehicle speed.

FIG. 5 is a block diagram of a conventional brake energy regeneration device for a vehicle.

[Explanation of symbols]

 A Regenerative brake controller 30 Brake pedal 31 Accelerator pedal 37 Brake pressure sensor 40 Electromagnetic valve 51 Accelerator sensor 53 Vehicle speed sensor 55 Accumulation sensor 57 Outside air temperature sensor

Claims (3)

[Claims]
1. When operating a brake device of a vehicle, a pump motor is driven by the rotational force of a wheel drive system to pump oil in the low pressure side accumulator to the high pressure side accumulator to accumulate pressure, thereby recovering brake energy. In the vehicle brake energy regeneration device according to the present invention, the vehicle speed is predetermined based on the operating pressure detecting means for detecting the operating pressure of the brake device, the vehicle speed detecting means for detecting the vehicle speed, and the detection signal output from the vehicle speed detecting means. When the value is less than or equal to a value, control means for driving the brake device according to the operating pressure based on a signal output from the operating pressure detecting means for stopping the recovery of the brake energy and returning the operation of the braking device, The outside air temperature detecting means for detecting the outside air temperature, and the breaker based on the detection signal output from the outside air temperature detecting means. Brake energy regeneration system of a vehicle, characterized in that configured to include a vehicle speed setting means for setting by varying the speed prescribed value as a reference of recovery cessation of energy, a.
2. A brake temperature detecting means for detecting a brake temperature is provided in place of the outside air temperature detecting means, and serves as a reference for stopping recovery of the brake energy based on a detection signal output from the brake temperature detecting means. The brake energy regeneration device for a vehicle according to claim 1, wherein the predetermined value of the vehicle speed is variably set.
3. The vehicle brake energy regeneration device according to claim 1, wherein the vehicle speed setting means sets the predetermined value of the vehicle speed to be lower as the outside air temperature or the brake temperature is higher.
JP5783394A 1994-03-28 1994-03-28 Brake energy regeneration device of vehicle Pending JPH07266912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5783394A JPH07266912A (en) 1994-03-28 1994-03-28 Brake energy regeneration device of vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5783394A JPH07266912A (en) 1994-03-28 1994-03-28 Brake energy regeneration device of vehicle

Publications (1)

Publication Number Publication Date
JPH07266912A true JPH07266912A (en) 1995-10-17

Family

ID=13066955

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5783394A Pending JPH07266912A (en) 1994-03-28 1994-03-28 Brake energy regeneration device of vehicle

Country Status (1)

Country Link
JP (1) JPH07266912A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6275763B1 (en) 2000-03-24 2001-08-14 Ford Global Technologies, Inc. Temperature dependent regenerative brake system for electric vehicle
CN105564250A (en) * 2014-11-03 2016-05-11 现代自动车株式会社 Braking control method and system for eco-friendly vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6275763B1 (en) 2000-03-24 2001-08-14 Ford Global Technologies, Inc. Temperature dependent regenerative brake system for electric vehicle
CN105564250A (en) * 2014-11-03 2016-05-11 现代自动车株式会社 Braking control method and system for eco-friendly vehicle
US9707848B2 (en) 2014-11-03 2017-07-18 Hyundai Motor Company Braking control method for eco-friendly vehicle
CN105564250B (en) * 2014-11-03 2020-09-25 现代自动车株式会社 Brake control method and system for environmentally friendly vehicle

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