Bosch Motorsport | Knock Sensor KS4-R

Knock Sensor KS4-R

 Frequency: 3 to 25 kHz Weight: 82 g
 Height sensor head: 18 mm

This sensor is used for detecting structural born vibrations in spark ignition engines due to uncontrolled combustion. This sensor is suitable for operation in extreme conditions.
Due to the inertia of the seismic mass, the sensor
moves in correlation to the engine block vibration;
this motion results in a compressive force which isconverted into a voltage signal via a piezoceramicsensor element. As a result, upper and lower voltage
thresholds can be defined directly correlating to an
acceleration magnitude.
The main benefits of this sensor are its robust mechanical design, compact housing and precise determination of structure-related noise. Connection to thissensor can be tailored to customer requirements
through specified wire lengths and various connector options.
Application

Electrical Data
Range of frequency

3 to 25 kHz

Sensitivity at 5 kHz

28.8 mV/g

Max. sensitivity changing (lifetime)-17 %Linearity between 5 to 15 kHz(from 5 kHz value)-10 to 10 %Linearity between 15 to 20
kHz (linear increasing withfreq)

20 to 50 %Main resonance frequency> 30 kHz

Impedance> 1 MOhm

Temperature dependence ofsensitivity

0.04 mV/g°C

Capacity field

1,150 ± 200 pF

Connectors and Wires

Application

3 to 25 kHzConnector

A261.230.252

Operating temperature range-40 to 130°C

Mating connector 2-pole

Storage temperature range-30 to 60°C

2-Pin RB-Kp.1(D261.205.337-01)

Max. vibration≤ 800 m/s2

Pin 1

Sig +

Pin 2

Sig -Sleeve

PUR

Wire size

0.5 mm2

M8x25

Wire length L

530 mmMale thread (for AI)

M8x30

Various motorsport and automotive connectors on request.

Installation torque20 ± 5 Nm

Installation Notes

Weight w/o wire

82 g

ProtectionIP 54

Technical Specifications
Mechanical Data
Male thread (for cast)

The KS4-R can be connected to all Bosch Motorsport ECUs featuring knock control

Bosch Motorsport | Knock Sensor KS4-R

2|2

The sensor must rest directly on the brass compression sleeveduring operation.
To ensure low-resonance coupling of the sensor to the measurement location, the contact surface must be clean and properly
machined to provide a secure flush mounting.
Please route the sensor wire in a way that prevents resonance vibration.
Please find further application hints in the offer drawing at ourhomepage.

Safety NoteThe sensor is not intended to be used for safety related applications without appropriate measures for signal validation in the application system.
Legal Restrictions
Due to embargo restrictions, sale of this product inRussia, Belarus, Iran, Syria, and North Korea is prohibited.
Ordering Information
Knock Sensor KS4-R
Order number 0261.231.218

Dimensions

Represented by:
Europe:Bosch Engineering GmbH
MotorsportRobert-Bosch-Allee 174232 AbstattGermany
Tel.: +49 7062 911 9101
Fax: +49 7062 911 79104
motorsport@bosch.com
www.bosch-motorsport.deNorth America:
Bosch Engineering North America
Motorsport
38000 Hills Tech Drive
Farmington Hills, MI 48331-3417
United States of America
Tel.: +1 248 876 2977
Fax: +1 248 876 7373
motorsport@bosch.com
www.bosch-motorsport.com© Bosch Engineering GmbH 2024 | Data subject to change without notice51717259 | en, 1, 19. Jul 2024

Asia-Pacific:
Bosch Engineering Japan K.K.
Motorsports Department
1-9-32 Nakagawa Chuo, Tsuzuki-ku
Yokohama City
Kanagawa Prefecture 224-8601
JapanTel.: +81 45 605 3032
Fax: +81 45 605 3059
www.bosch-motorsport.jp

Australia, New Zealand and South
Africa:Robert Bosch Pty. Ltd
Motorsport
1555 Centre Road
Clayton, Victoria, 3168
Australia
Tel.: +61 (3) 9541 3901
motor.sport@au.bosch.com